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What is a steam trap?

Steam Trap is an important component of a steam system. Steam traps have an important role to play in keeping the productivity and reliability of the steam system. The role of a steam trap is to remove condensate, air, and other incondensable gasses from a steam device while not allowing live steam to escape. The need for steam traps, requirements pertaining to their operation, standard modes of operation, troubleshooting, and related requirements are all addressed by this article guide.

steam trap drawing

Steam Trap

 

What is a steam trap?

A steam trap is among the family of automatic drain valve that determines steam and condensate.  Steam traps hold back steam & discharge condensate under different pressure or loads. Steam traps should have a reasonable capacity to easily expel air and other non-condensable gases while maintaining live steam back. In industries, steam is used daily for healing purposes or as a driving force for mechanical control. Steam traps are being used to ensure that steam is not lost in such applications.

In an official statement, ANSI defines a steam trap as:

“Self-contained valve which automatically drains the condensate from a steam containing enclosure while remaining tight to live steam, or if necessary, allowing steam to flow at a controlled or adjusted rate. Most steam traps will also pass non-condensable gases while remaining tight to live steam.”

 

Why is a steam trap needed?

In simple words, steam traps are being used to eliminate condensate and non-condensable gasses from the steam system.

Steam is produced as the water vaporizes to change its state to gas. In order for the phenomenon of vaporization to occur, the water molecules should have enough energy to break the bonds between molecules. This energy provided to transform a liquid into a gas is called ‘latent heat.’

The steam produced by the boiler provides the heat energy needed to heat the product. Once steam loses its energy by heating the product in the process, the condensate is formed. A majority of the energy found in steam is often wasted due to radiation leaks from valves and fittings. Since this heat is lost, the steam is condensed and become saturated. If this condensate is not removed instantly as soon as it develops, the operational performance of the device can be minimized by slowing down the heat flow to the phase.   If condensate is present in a steam system it will cause physical harm due to water hammering or corrosion.

In the bottom of a horizontal conduit, the condensate is collected with steam moving above it. If the condensate builds up, it will create a dense mass of incompressible water that moves at high speed. As a pipe bend, fitting, or valve abruptly blocks the slug of water, it may cause mechanical damage to the pipe or fitting.

It is similarly important to eliminate air and other non-condensable gasses from the steam system for four critical aspects.

  • When the operation is resumed, if the air is present in the system steam is not able to enter, until the air is vented out.
  • An air-steam mixture has a temperature far below the steam temperature, which reduces the transmitted heat.
  • Air slows-through the heat transfer as it clings to the inside surface of the pipe or vessel.
  • Dissolved in condensate, non-condensable acid gasses that corrode the system.

 

How does a steam trap work?

All steam traps operation can be categorized under one of three fundamental working principles: velocity, temperature, or density. Over time, various types of steam traps have been built to accommodate different applications. The important function of a steam trap is the ability to differentiate between steam and condensate. Various types of steam traps use various operating criteria and methods to differentiate between steam, condensate, and air. When categorized according to these operating principles, each type has advantages and disadvantages which must be addressed when choosing a steam trap for a particular application.

 

How many different types of steam traps are there?

Steam traps can be divided into two main types owing to their working principles, they are:

  1. Mechanical steam traps: Mechanical steam traps work on the concept of specific gravity, as compared to other types of steam traps that depend on temperature change or velocity/phase change. In mechanical cages, the valve opens and shuts due to the displacement of a float that rises and falls with a condensate surge.

There are two major designs of mechanical traps: float traps and inverted bucket traps. Float traps generally use an enclosed spherical float, whereas inverted bucket traps use a buoyant, cylindrical cup turned upside down.

Buoyancy is a key element working at the core of all types of mechanical traps, but the mechanisms and operating concepts are a little different.

  • Ball float steam trap: It incorporates the effect of both temperature and density. A ball float opens the primary valve as enough condensate reaches the trap to raise the float, discharging the condensate. When the machine drains, the ball drops and the valve shuts down. A separate thermostatic component at the top of the trap gets open for the release of air and non-condensable gases, as soon as they induce a slight temperature drop in the trap.

Ball float steam trap

  • Inverted bucket steam trap: It employs an upside-down bucket or an open float, which works on the density difference of steam and water. Steam flowing under the inverted and submerged bucket allows the vapor to float and shut the discharge valve. Condensate filling the trap allows the bucket to sink, releasing the trap valve to remove the condensate. A small vent at the top of the bucket allows the stored air to flow through to discharge the condensate.

Inverted Bucket Steam Trap

Inverted Bucket Steam Trap

  1. Thermodynamic steam trap: Thermodynamic steam traps are appreciated for their small size and flexibility over a wide range of pressures. They may have a basic construction and work either horizontally or vertically. These properties make thermodynamic steam traps a popular alternative for a wide range of tracing, drip, and light flow steam applications.

There are two basic types of thermodynamic steam traps: thermodynamic disk and thermodynamic impulse (thermostatic steam trap).

  • Thermostatic steam trap: The pressure determines the temperature of saturated steam. In the steam chamber, steam loses the enthalpy of evaporation (heat), creating condensate at steam temperature. As a consequence of any more heat loss, the condensate temperature will decrease. A thermostatic trap will allow the condensate to pass when this lower temperature is observed. When the steam enters the trap, the temperature rises and the trap shuts.

Thermostatic Steam Trap

Thermostatic Steam Trap

  • Thermodynamic steam trap: Thermodynamic traps are the most common type of traps, they are built on the theory of velocity. Condensate and air reach the trap and travel into the gate, heating, and control area. When steam or flash steam enters the entry, the flow speed rises and the disk is pulled towards the seat. The disk is closed with rising pressure in the control chamber. The controlled swelling of vapor pressure over the sealing face of the disk causes the trap to open up again and controls the speed of cycling.

thermodynamic steam trap

Thermodynamic steam trap

Why are steam traps so important? 

It costs money to produce and hold steam for process and space heating in the factory. That is too costly to waste. Steam is taken from a furnace to thousands or hundreds of branches. The steam trap prevents the steam from escaping out of the device at the end of each branch.

If condensate is not extracted, flowing steam and small waves within the pipe can be pushed together with faster-moving steam. The force of the steam behind the plug produces the water lull like the strength of a battering ram, if one of the waves hits the top of the pipe basically plug. This water trick will ram into teas, knees, pumps, floats in some traps, and other device equipment. This behavior can be very damaging and is one of the types of water hammer.

Steam, condensate, and air will share the same space inside a heat exchange unit. As condensate, air, and non-condensable gasses are separated as soon as they are created, the steam has more surface to transmit heat energy. Steam in the presence of water or air is an energy transfer medium that is less effective than dry steam.

 

What happens if a steam trap blows through?

If the malfunction of a single trap is overlooked, some steam can blow out and be released into the atmosphere. Steam costs an average of $5/1000 lb to produce, thousands of dollars can be lost every year. Current trap surveys have found that the average faulty trap losses 50 lb of steam per hour. The annual loss amounted to more than 400,000 Ib of steam at a rate of $2044. Multiply this by 100 to estimate the scale of a standard steam machine, and minor steam losses begin to add up to real money. Small traps are the secret to saving steam, not because they are vulnerable to collapse, but because there are several of them.

Functionally, a blow-through trap can have effects that extend into its heat exchange system. If the failed trap is attached to the condensate return line in which the other traps are discharged, the unexpected amount of live steam can pressurize the return line, causing backpressure for the other traps. Any steam traps do not work properly under high backpressure. In either case, the elevated back pressure may cause condensate to back up in other parts of the system.

 

What happens if a steam trap locks shut and Won’t discharge?

When the trap on the steam line fails closed, the closed valve does not allow the steam and condensate to flow through it and accumulates in the line. The condensate continues to move to low spots and collect there, with the ability to partially obstruct the flow of steam and cause a water hammer. If the line is exposed to temperatures below zero, the condensate can freeze and the pipe may be broken.

Some major problems that can be seen are:

  • Water Hammer and pressure surge.
  • Water Logging in the process.
  • Damage to piping and Process equipment.
  • Compromise safety.

 

What makes one type of trap better than another?

It totally depends on the application and operating requirements of a trap that is to be used. It also depends on what is expected from a steam trap to do. Steam traps are commonly used for the following requirements:

  • To minimize steam loss.
  • To draw maximum output from the heat exchange equipment that is used.
  • For a smooth operation that is failsafe and trouble-free.
  • Increase the lifespan of equipment present in the system.
  • For reliability of operation even under dirty steam conditions.

 

Where should traps be located?

Accessibility, all traps will crash, and fail. Traps must be tested periodically so that the damaged trap does not waste steam for months or years. The inspection method is made simpler if the trap can be approached effortlessly. Often, a list of the trap positions makes it easy to locate all the traps.

Below the machinery is being drained. Although the heater coil and its steam trap will work at 250 psi steam pressure, the condensate must be pulled into the trap at some point of gravity. With most heat exchangers, the thumb rule is to position the trap inlet at around 10 to 12 inches. Below the relation of the condensate drain. A 6-inch dirt pocket should be given to shielding the trap from dirt and size.

Steam mains need some additional care since high-speed steam makes it difficult to remove the condensate. The drip leg should be adequately designed, the same height as the mainline, up to and above 4 in., use one-half of the mainline size, but not less than 4 in.

Close to the facility being emptied. As noted above, the flow of gravity carries the condensate to the trap. Around the same time, air and steam are being pushed upward through the pipe. To mitigate issues with this counter-flow, stop long pipe runs to the steam trap.

 

In summary.

Steam traps are safety equipment that is employed to increase productivity and at the same time operation cost of the process is lowered. We have provided a brief introduction to the steam trap in this article. STV is a professional China steam trap manufacturer, please feel free to contact us if you have any questio

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What Is A Bellow Valve

What Is A Bellow Valve

A Bellows Valve is a specially designed valve suitable for use in industries dealing with a hazardous medium where even minute leakages can be extremely critical. With the exponential growth of new industries such as the chemical and nuclear industry, there is a growing abundance of flammable, hazardous, extremely poisonous, and toxic media flowing through the pipelines. This creates a high risk of leakage, explosion, and health hazards. So, the valves used in such pipes and systems have specific stringent leakage and sealing requirements.

The need for a completely different approach required for the desired sealing & redundancy has led to the development of Bellow seal globe Valve.

 

 

Table of Content

1. What Is A Bellow Valve

2. Construction of Bellow Seal Globe Valve

3. How Does Bellow Seal Globe Valve Work

4. Advantages of Bellow Seal Globe Valve

5. Comparison of Bellow Seal Globe Valve with Normal Valve

6. Bellows Selection Guide

7. Application Ranges of Bellow Seal Globe Valve

8. Precaution for Bellow Seal Globe Valve

9. Reason of Leakage for Bellow Valves

10. Summary

 

Construction of Bellows Seal Globe Valve

Metal bellows are the main feature of a Bellows globe seal valve. There are two types of bellows:

i. Formed Bellow – They are made by rolling the flat sheet into a tube and longitudinal fusion welding. After this, the tube is mechanically formed into bellow with rounded and widely spaced folds.

ii. Welded leaf Bellow – In this type, the washer-like plates of thin metal are welded together. The welding is performed on the inside and outside of the washer-like plate. The folds per unit length in welded leaf bellows are more.

The amount of movement per fold is the same for both formed and welded-leaf bellows. So, for the same stroke rate, the mechanically formed bellows are two to three times longer than their welded leaf equivalent.

The lower end and the stem assembly is welded by automated seam welding, while the upper end is welded by automated seam welding on the connecting plate, creating a metal shield between the fluid medium and the environment, ensuring zero leakings from the valve stem.

 

 

The sealing surface of the valve disc and the valve structure is precisely ground, so once the installation has been done, it is confirmed that it has 100 % passed a pressure test and the possibility of any kind of leakage is eliminated. As an auxiliary seal, the stuffing box is always held on the bellows, which improves durability and protection. The metal bellows of the high-pressure valves have a multi-layer construction which will guarantee an open/close life of 10000 times at the highest pressure by hydroforming.

 

How Does Bellow Seal Globe Valve Work

A Bellows Seal Globe Valve is a compact structure that is a kind of control valve which uses bellows for sealing the valve stem components. The bellows valve has a bellow inside, and the lower end of the stainless-steel bellows is welded to the stem to prevent the system fluid from eroding the stem. The other end is positioned between the body of the valve and the cover of the valve to create a permanent seal. This double seal configuration eliminates leakage i.e., even if the bellows collapses, the stem packaging will prevent further leakage. The bellows are welded to the valve stem to ensure stable operating efficiency and prevent the vibration of the valve stem induced by the movement of the valve insert.

 

 

 

Advantages of Bellows Seal Globe Valve

1.     The most prominent advantage of any bellows valve is the Double seal design (bellows + packing). So, even if the bellows fails, the stem packing will prevent any kind of leakage to meet the international sealing standards.

2.     It minimizes any loss of medium fluid and ensures the safety and environmental protection. This will ultimately improve the safety of the plant where is bellows valve has been installed.

3.     It can act as an energy saver as it contributes to minimizing energy losses due to leakage.

4.     Since the leakage is minimized, it prevents frequent maintenance of the valve. So, it leads to longer valve life.

5.     Owing to longer service life, operating and maintenance cost is considerably reduced.

6.     The rugged bellows seal design ensures zero leakage from the valve stem, thereby providing the maintenance-free conditions.

7.     The safety of working personnel is improved with the installation of a bellows valve as emissions of inflammable, toxic, and hazardous chemicals can be minimized.

 

Comparison of Bellows Seal Globe Valve with Normal Valves

Ø  When valves with gland packing are used such as gate valves or ball valves in the system for heated oil transfers (permeability of heated oil is about 50 times that of steam), chances of hot oil spillage are quite high and can cause loss of equipment and property. In such cases, due to its construction, the bellows valve can ensure absolutely nil leakage.

Ø  In ordinary valves, the shape of graphite packing cannot provide 100% effective sealing which is the main reason for frequent leakage of packing valve. As ordinary fillers are manufactured with graphite, if the purity of graphite is not adequate, its oil resistance would below. When heating oil being transferred is soaked in a graphite filler, certain graphite impurities get separated and flows along with it.

Ø  When a ball valve is used in the system with heated oil, if the internal PTFE is not resistant to high temperatures, it will quickly deteriorate and cause valve leakage.

Ø  The internal parts of the bellows valve are made of stainless steel, which can withstand a temperature of 425°C. Considering the life span of Bellows Seal Globe Valve, the duration of the general bellows valve is more than three years. Therefore, to maintain the reliability of output and to reduce the direct running costs, a bellow shut-off valve is preferred over ordinary seal valves in case of a system where heated oil is being transferred.

 

Selection Guide for Bellows

1.     Choose the inner diameter of the bellows according to the diameter of the valve stem. The inner diameter of the bellows should be greater than the stem diameter of 115 mm.

2.     The outer diameter of the bellows is selected according to the inner diameter of the bellows. The outer diameter and the inner diameter are related by the ratio of the outer diameter to the inner diameter. In general, the ratio of the outer diameter to the inner diameter is 113 to 115.

3.     The wall thickness, number of layers, number of corrugrtions, and length of the corrugated pipe must meet the requirements of the pressure resistance, stroke, and cycle life of the corrugated pipe. Under normal circumstances, greater the pressure, more thickness of the bellows is required. To increase the displacement or reduce the stiffness of the bellows and increase life, the thickness of the single layer can be reduced and the number of layers of the bellows can be increased.

4.     For handling higher pressures, the multiply design of bellows is recommended. The pressure that bellows can withstand can be increased by using 2 or 3 piles of the metal wall as in case of multiply design of bellows. Pressure rating by using a two-ply bellow can increase by 80% to 100% than single-ply bellow of the same thickness. Alternately, the stroke length is reduced if single-ply bellow of a thickness equivalent to the pressure rating of two­ ply bellow is used. So, we get a distinct advantage of multi­ply design over the single-ply thick bellows.

5.     To prevent the distortion of bellows, the designed guide structure must be strictly followed.

6.     To prevent wear and premature failure, local contact between the valve stem or bellows must be avoided.

7.     The design should be such that twisting and torsional deformation of the bellows is prevented.

8.     The valve design should be limited by the extension stroke and compression of the bellows. This is to prevent displacement of the bellows and to withstand compression and tensile extension beyond the defined cycle life test. Under normal conditions, the stroke of the bellows should not exceed 25% of the free length. If this is not fulfilled, it will affect the cycle life of the bellows, especially bellows valves under high temperature and high-pressure environment.

9.     The bellows adopt the same pressure and temperature grade as the Bellow seal Globe Valve. The bellows must withstand the pressure test of the nominal pressure of the main valve at 38 ℃ and 115 times the nominal pressure at 38 ℃. During the pressure test, the weld should not crack or leak, and the bellows should not twist.

10.  The material of the bellows components should be selected within the allowable temperature range, and it should have good formability, welding performance, and compatibility with the medium.

 

Application range of Bellows Seal Globe Valve

·       Bellows valves eliminate the risk of leakage of the process fluid and are therefore ideally suited for applications where leakage cannot be tolerated from the valves. So, places where highly hazardous materials such as hydrogen, ammonia, chlorine, and other similar poisonous or explosive material are handled, these valves are preferred.

·       It is suitable for use as a shut-off valve with heat-conducting oil, toxic, flammable, highly permeable, environmentally polluting, and radioactive fluid pipelines. It can be considered as a high-quality product for creating a leak-free factory.

·       To name a few, bellows seal globe valve is highly used in petrochemical industries, electronics industry, various plants, vacuum industries, etc.

 

Precautions for Bellows Seal Globe Valve

Ø  To avoid damage or injury to personnel or equipment, always read all warnings and instructions. Unprofessional re-conditioning, the use of foreign replacement parts, or the incorrect maintenance steps, may cause a loss of efficiency or lead to personnel injury or damage to parts.

Ø  Use double seal bellows in case of a highly corrosive chemical environment so that you get two protective layers of sealing.

Ø  If you find that there is a smell of media in the air or the valve cover is wet, it is generally because the bellows have been damaged by the medium.

Ø  You can replace the bellows by yourself or get it replaced by makers. Replace it to avoid prolonged negligence, a threat to life, and damage to the entire valve.

Ø  An excessively tightened gland nut can cause excessive packing wear and can hinder the free movement of the plug stem.

 

Reasons for Leakage of Bellow Seal Glove Valve

There are many reasons for the leakage of a Bellows Seal Valve. Bellows valve leakage is generally divided into internal leakage and external leakage.

 

bellow globe valve

1.     It is because the liquid medium contains solid impurities that damage the sealing surface and cause failure.

2.     Combined with the analysis of the on-site usage, the reason for the leakage of the valve stem is mainly related to the valve structure, working environment, and operation mode.

3.    The valve stem adopts a double sealing structure of bellows and packing. The bellows are welded with the inner lining ring and the outer lining ring to form a bellows assembly and then welded with the valve stem and the guide body to block the leakage of the medium through the valve stem. The valve stem of the bellows valve moves up and down by the flat key, until the upper-end surface of the flat key contacts the lower end surface of the lower packing. Since the lower packing is made of PTFE material, if the valve is opened too much, the flat key will be embedded in the packing, the bellows valve can no longer be opened and closed, and the bellows assembly is knocked to death, causing the medium to leak along the valve stem.

4.     Tensile elongation and compression of the bellows valve according to the line determination process can contribute to leakage. If tension or compression exceeds the limit, the bellows may be damaged, resulting in small series hose rupture, seal failure. Therefore, it is necessary to increase the limit device for opening and closing of the bellows valve, so that the bellows always expand and contract within the design range during the operation of the valve.

10. SummaryAPI

The unique design of Bellows Seal Globe Valve and its efficiency to provide leak-proof operations makes it the best-suited valve for a wide range of applications, especially hazardous materials & where system media is at high temperatures. Durability, maintenance-free operations and cost-effectiveness is an added benefit with bellows valves.

STV Valve is a professional China bellow seal valve manufacturer, don’t hesitate to contact us if you have any inquiry

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Spring Check Valves VS Swing Check Valves

Swing check valves are by far the most common check valve in any industry. They are often a lower-cost solution and may work in many horizontal flow applications. However, it’s important to understand the differences between these types of check valves. In this article, we’ll cover some basic differences between these two types of inline check valves. We well also cover the advantages and disadvantages of each.

spring check valve

china spring check valve Supplier

1. One difference between these types of check valves is how they allow and prevent flow. A swing check valve uses a flapper that ‘swings’ off the seat to allow forward flow and then swings back onto the seat when the flow is stopped. In contrast, a spring loaded check valve incorporates a spring to assist in closing the valve. Learn more about spring check valves!

2. Swing check valves are limited in the orientation in which they can be installed. These type of check valves can only be installed in horizontal flow applications, which greatly limits the applications where they can be used. While swing check valves do offer a larger flow capacity, they may not always fit in existing piping configurations. On the other hand, spring loaded check valves can be mounted in any flow orientation with the right spring selection. In you need a check valve for a process skid, a difficult space with challenging dimensions, or even unique direction of piping, choosing a spring check valve with the proper spring setting (spring cracking pressure) provides more possibilities for finding the right solution for your specific flow control application.

3. Any water hammering effects present in a piping system can potentially be amplified by a swing check valve. Installing a spring loaded check valve can prevent effects of water hammer; whereas a swing check valve can exacerbate the issue. Spring check valves are considered “silent check valves” by utilizing a spring to assist the poppet in closing the check valve prior to fluid flow reversal. The following is a basic example to explain the concept of water hammer.

Consider an application where you have a process line with water in it. For flow control you have a check valve and downstream of that check valve you have a lever handle quarter turn ball valve. Let’s say water is flowing and someone shuts the quarter turn ball valve abruptly. This can produce a pressure wave flowing through the piping – this is what is known as water hammer. With a swing check valve specifically, the flapper on that valve will be open until that pressure wave returns back to the swing check. The pressure wave can cause the flapper to slam shut, both of which can contribute to inducing water hammer. Conversely, a spring loaded check valve will help minimize, and in some cases, eliminate the effects of water hammer because the spring in the spring check closes before the pressure wave gets there.

We hope this clears up any confusion you may have around the differences between these different type of check valves and that you learned the advantages offered by spring check valves. All the valves Check-All Valve manufactures are inline spring loaded poppet style check valves. Our expert staff can answer any questions you may have. Use the comments to post your questions or tag us on social media. Stay tuned for our next article!

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An Overview of Butterfly Valves

Butterfly valves belong to the family of quarter-turn rotational valves, created and first used in steam engine prototypes as early as the 18th century. Use of butterfly valves grew in the 1950s for applications in the oil and gas market, and 70 years later they continue to be widely used in numerous industrial applications.

Butterfly valves can be assembled with handles, manual gears, pneumatic or hydraulic actuation. The valve configuration consists of a stem and disc that rotate 90° from open to close in the clockwise direction. Butterfly valves are popular in many applications as they are cost effective to maintain, offer fast operation and are lightweight compared to other types of valves. Most butterfly valves use the same basic configuration, with a body, stem, disc, seat and stem seal; however, other parts may vary between the different butterfly valve types, such as resilient seated, lined, single offset, double offset (often referred to as high performance) and triple offset. These types are differentiated by the geometry of the disc, stem, seat and the material of the seating designs.

A key advantage of selecting a butterfly valve is the reduction of space and weight to a system compared with other options such as ball, check, globe or gate valves. Compared to a gate valve, installation of butterfly valves is less difficult from size and weight, and compared to ball valves, the cost to replace or repair is usually less. Butterfly valves are limited based on their application as they have an obstructed port, as part of the disc always faces the flow even when fully opened and they are not typically utilized in heavy slurry applications as a knife gate or severe service ball valve is preferred. Butterfly valves are also versatile products that can be used in both isolation and light control/throttling services.

RESILIENT SEATED CONCENTRIC

Resilient seated valves are concentric with the pipeline, as the disc is held in the center of the valve. This valve type is position seated, with continuous disc-to-seat interference. Ratings are commonly in cold working pressure (CWP) rather than class rating but fit between ASME Class 125 and Class 150 flanges. Resilient seated valves are often designed below ASME pressure class ratings, thus more cost effective for low pressure applications. Stem sealing consists of a primary seal (seat flat to disc hub), secondary seal (stem diameter larger than a hole in seat) and tertiary seal (upper stem seal).

Typical body materials include ductile iron, cast iron, carbon steel, aluminum, stainless steel and aluminum bronze. Typical seat materials include EPDM, Buna-N, PTFE, natural rubber and more. Resilient seated butterfly valves are mostly used for isolation and control applications including HVAC, chemical and petrochemical, food and beverage, power generation, water and wastewater, oil and gas, mining and dry bulk handling. They are selected based on compatibility with the media running through the pipeline and flow conditions.

POLYMER-LINED CONCENTRIC

Lined butterfly valves are also concentric with the pipeline and designed to be utilized with harsh chemical media: These polymer-lined products offer longer life in media with higher levels of acids. Options include PTFE-lined and PFA-lined valves, both used in the petrochemical, food and beverage industry with corrosive media. One of the main differences between the liners is that in steam engine prototypes PFA liners remain flexible in contrast to PTFE liners over time based on the way they are manufactured. PFA is melted and chemically bonded while PTFE is sintered. Melting and chemically bonding creates a denser material and minimizes air pockets, resulting in flexibility and tight shutoff over long-term use for harsher chemical applications. The PTFE lined butterfly valve is typically used in water, brine, pulp stock and weak acid applications. The disc material can also vary based on application, between stainless steel, or lined stainless steel with PTFE, PFA and UHMWPE (ultra-high molecular weight polyethylene).

HIGH PERFORMANCE

High performance butterfly valves (also called double offset) have two offsets: The first offset of stem is off center to or behind the disc seating face, followed by the second offset, which shifts the stem off centerline of the pipeline. This double offset creates camming action, moving the disc away from the seat rather than across it, reducing rubbing between the disc and seat as seen in concentric and single offset valves.

The double offset is commonly used for isolation and control applications, as well as higher cycle applications when compared to a concentric design. Most applications are made for higher temperature and pressure than resilient-seated valves. The seats are designed to provide reaction force (contact stress) to disc when in the closed position. This contact stress creates the seal with the disc edge. These designs can be pressure dependent, while others use interference fit provided by a seat energizer for that pressure range. Common body materials include carbon steel, stainless steel and aluminum bronze. Common seat materials include PTFE, reinforced PTFE, TFM, UHMWPE and Inconel.

Additional seat designs for specific application can also include fully metal seated and fire safe (both soft and metal seat). The metal seated design can withstand higher temperature capabilities up to 900°F in dirty service, abrasive service and control applications with hot and dirty service. The fire-safe seated design is used in services at risk for fire, using a soft seated material for isolation while still providing a constant metal-to-metal backup seal to the disc in the event of a fire. The intent of the valve design in these applications is to provide isolation to prevent feeding the flames.

The double offset design can be configured for cryogenic applications; they are most often used in industrial gas applications such as argon, helium, hydrogen, nitrogen and oxygen. The choice of materials is based on the service, focusing on toughness and impact strength of the pressure boundary materials at process temperature. The standards for these applications include strict material specifications along with cleaning requirements for safety and operation of the valves while in service.

TRIPLE OFFSET

Triple offset valves share the first and second offset concept with high performance butterfly valves and include an additional third offset, with the seating surfaces using an inclined conical surface. This third offset enables the sealing element (seal ring) to only engage the seating surface in the final

degree of closing (and immediately disengaging from the valve seat upon opening) resulting in no rubbing between the sealing components. This valve type is torque-seated, meaning torque is applied to load the sealing elements and provide the shutoff performance. The seal ring can either be laminated layers of metal and graphite or a solid metal sheet, both of which are field replaceable. The valve seat can either be bolted in (field replaceable) or integral to the valve body. Triple offset valves are inherently fire safe and applicable to pressure classes from Class 150 up to Class 1500. This design can be used in a broad temperature range of -320°F to 1,500°F in varying configurations due to the metal-to-metal sealing.

Common body materials include carbon steel, stainless steel and aluminum bronze while common seat materials include 316 stainless steel hard-faced, nickel aluminum bronze, Stellite and duplex stainless steel. Common seal materials include laminated duplex stainless, Monel, XM-19 or Inconel metal layers with either graphite or PTFE, and solid metal options include duplex stainless steel, Inconel or XM-19. Main applications for the triple offset valves include steam-distribution, petrochemicals, tank farms, terminals, and switching.

The triple offset valve configured for cryogenic service, allow for temperature as low as -420°F; it is used in LNG, liquid hydrogen and liquid oxygen service, to name a few. Extended bonnets keep the stem packing from the extreme cold temperatures.

The higher temperature designs, up to 1,500°F, use a solid seal ring and a bonnet to dissipate heat transfer to the packing and actuation. This design is mostly used in turbines, molten salt and hot air applications.

END CONNECTION TYPES

Butterfly valves have multiple options for end connection types, including wafer (flangeless), lug, double flanged and buttweld end. Some options allow for ease of maintenance, some are suited for dead-end service and some designs have weight and cost reduction implications compared to each other.

  • Wafer valves are designed to be installed between flanges, with a short face-to-face dimension in relation to the pipeline diameter. These valves cannot be used for dead-end service, which requires additional isolation valves when shut down for maintenance. Wafer options are lighter and cheaper than lug style and often used in lower pressure applications.
  • Lug valves are designed to be bolted to one or both flanges using fasteners threaded into lug protrusions on the valve body, with a short face-to-face dimension in relation to the pipeline diameter. These valves can also be used in dead-end service depending on seat design but may be de-rated and can be heavier than wafer style.
  • Double flanged valves are designed with flanges on both ends of the body to secure the valve to mating flanges on the pipe with bolts or studs and nuts. They can be used in dead-end service; however, some valve types may be de-rated.
  • Buttweld end valves are designed with bevels (weld preparation) on each face to match thickness and bevel on the pipe. The two ends are butted to the pipeline and welded, used in applications where dismantling is not common, or a potential leak path between flange bolting is a concern.

AUTOMATION TYPES

Many types of actuators can control the opening and closing characteristics of a butterfly valve. The actuator provides the torque required to properly open and close the valve during service. The following types of actuators are paired with butterfly valves:

butterfly valves:

  • Manual valve operation is the simplest form of actuation. It uses a wheel or lever to control the position of the stem and disc. Manual operators are also very inexpensive and typically are used with smaller sized valves that have a lower torque requirement. These are especially suitable in applications where power is not present to operate the valve. The speed of manual operators is somewhat slow, so they would not be used in emergency shut-off applications.
  • Electric valve actuators contain a gearbox that can adjust motor speed, raising or lowering the torque. The electric actuators are easy to maintain, are relatively simple to install and are fairly quiet during operation. The position of the valve is based on the voltage or current signal input and can contain limit switches that stop the actuator when fully closed or fully open. Electric actuators are used where there is a stable power supply.
  • Rack and pinion actuators contain springs within a chamber that operate from the entry and exit of compressed air. These types of pneumatic actuators can be single or double acting, are compact in design, relatively inexpensive and lightweight. They have quicker reaction times, allowing for their use in throttling services; they need an external supply of compressed air.
  • Scotch yoke actuators can be operated with compressed air or with hydraulic fluid. These consist of a crank and piston in a hollow cylinder. Pressure is applied to one side, and the resulting force moves the piston linearly to rotate the stem and disc. These actuators can be designed with modules for ease of maintenance by just removing one section of the actuator instead of the entire assembly. The scotch yoke is larger and more costly than the rack and pinion, but output creates much higher torque for larger sized valves. The scotch yoke also can be paired with control accessories for use in quick acting or soft closing applications.
  • Hydraulic valve actuators use hydraulic force supplied by a fluid to control the position of the disc and stem. They are available in either single or double acting. Single acting works by the absence of fluid pressure, keeping the valve in the closed position; as pressure builds up, the fluid pushes the piston towards the valve to open. The double-acting type contains a hydraulic pump that changes the direction of the fluid to open and close the valve. These actuators are used for the very large or heavy-duty valves that require a large torque to operate; they also can be used with solenoids to better control position.

BUTTERFLY VALVE DESIGN STANDARDS

Butterfly valves have many national and international standards that dictate the design criteria, such as wall thickness, face-to-face length, mounting patterns, flange drilling, fugitive emission and more. Below are some of the common standards for the many types of butterfly valve designs.

Common Standards for Valve Design

 

Butterfly valves offer a unique value proposition based on their weight, footprint, and cost effectiveness.  They provide a variety of options from seat material, sealing designs, and range of temperature and pressure ratings.  Butterfly valves offer one of the largest valve markets behind ball and gate valves.  They continue to grow based on the flexibility of automation, lower torque and improved fugitive emissions performance compared to linear valves.

Read: The Supply Chain Professional’s Elevated Role in Today’s Environment

 

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C95800 Wafer Check Valves

We finished manufacturing some C95800 Wafer Check Valves for one of our European clients, the details are as follows:

Product descriptions

Type Check Valve
Size 16”
DesignPressure JIS5K
Construction Dual Plate Type, With Retainer
Connection Wafer Type
Design & Manufacture API 594
End to End ASME B16.10
Connection JIS2216
Pressure & Temp ASME B16.34
Test & Inspection API 598
Body Material Aluminum Bronze C95800
Trim Material Aluminum Bronze C95800
Media W.O.G.

Medium: air
Working pressure: 5K

Body, bonnet: C95800
Spring: ASTM A182 F316

STV Valve Technology Group Co., Ltd
DATED April 19, 2022

dual Plate Check Valve WAFER Check Valve

dual Plate Check Valve Wafer Check Valve AL Bronze

 

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How long does a cast steel gate valve last?

How long does a cast steel gate valve last?

How many years is the service life of cast steel gate valve? Generally, at normal temperature, the medium is water and there is no high-strength hydraulic impact. Most cast steel gate valves can be used for 3 years and 5 years. The contract signed between the manufacturer and the customer states that the warranty period is one year, so it is necessary to eliminate the situation that the customer changes the working conditions at will. Cast steel gate valve can be used under the working condition of about 300 degrees

Generally, at normal temperature, the medium is water and there is no high-strength hydraulic impact. Most cast steel gate valves can be used for 3 years and 5 years. The contract signed between the manufacturer and the customer states that the warranty period is one year, so it is necessary to eliminate the situation that the customer changes the working conditions at will.
Can cast steel gate valve be used under the working condition of about 300 degrees?

 

The abrasion resistance of the first-class valve is 2000 times, while that of the first-class valve is 4000 times. The service life of gate valves varies from country to country. It is stipulated to be 30 ~ 40 years in Japan, while it is stipulated to be 40 years in the United States and France.
working principle
Most gate valves are forced sealed, that is, when the valve is closed, the gate shall be forced to the valve seat by external force to ensure the tightness of the sealing surface. The gate of the gate valve moves in a straight line with the valve stem, which is also called rising stem gate valve. Generally, there are trapezoidal threads on the lifting rod. Through the nut at the top of the valve and the guide groove on the valve body, the rotary motion is changed into linear motion, that is, the operating torque is changed into operating thrust.
purpose
1. The gate valve is only used to fully open and close the medium on various pipelines or equipment, and is not allowed to be used for throttling.
2. For the gate valve with hand wheel or handle, the auxiliary lever shall not be added during operation (if the seal is not tight, the sealing surface or other parts shall be inspected and repaired). Turn the hand wheel and handle clockwise to close, otherwise it will open. The gate valve with transmission mechanism shall be used according to the provisions of the product operation manual.

1.How long do valves last shut?

You can expect a shut-off valve to last about 10 to 25 years, with an average of 20 years. But, if they are not “exercised” every year or two, there is good chance a valve will be freeze prematurely in the open position just when you really need it to close for a plumbing emergency or repair.
2.When should a gate valve be replaced?
These problems are typically caused by mineral buildup, so you should fully close and open your gate valves every few months to clear potential problems. If your gate valve has severe pitting or corrosion, you will need to replace it.
3.How do you fix a gate valve that doesn’t close?

he first step if a gate valve will not close completely

If the handle of the valve does not turn freely then loosen the packing nut just above the valve body and around the stem of the valve. Loosening it just one turn should be fine – just remember to tighten it back up when you are done.

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BALL VALVE INSTALLATION & MAINTENANCE

Ball valves of all materials and seat types are easy to use and long lasting if installed and maintained correctly.

valve-installation-maintenance-ball-valves

Ball valves of all materials and seat types are easy to use and long lasting if installed and maintained correctly.

Storage Conditions

  • To protect the seat and seals, do not unpack the valves until they are ready for installation. By doing this you are protecting the valve from dust and debris which may eventually cause seat leakage.
  • Keep in a cool well ventilated space if storing for a longer period of time. For cast steel valves (Black finish) the body may require additional application of oil to prevent corrosion.

Valve Installation

  • Ball valves can be installed in any orientation. However in bigger sizes to reduce load on the valve caused by the actuator or gearbox trying to pull away it may be necessary to install with the drive shaft vertical. Electric actuators usually require vertical installation.
  • Verify the material of the ball valve body, seat and ball before installation. Ensure that there are no defects caused by storage or transportation.
  • Verify the pressure rating of the valve vs the application requirement.
  • Verify the temperature rating of the valve vs the application requirement.
  • Verify the valve thread (BSP, NPT, socket weld ANSI), flange (ANSI 150, ANSI 300 etc) or solvent weld (BLP schedule 40) vs the application requirement.
  • Complete all welding works before valve installation and be sure the flange has cooled to ambient  temperature before installing the ball valve.
  • Make sure there is no welding residue, waste, rust or other debris in the pipe before installation. Wash with water or a mild detergent if needed.
  • Clean the surface of the flange or pipe thread that will come in contact with the ball valve to ensure it is free of rust and debris. Wash with water or a mild detergent if needed.
  • Make sure there is no warpage of the flange or misalignment of the ball valve in relation to the flange.
  • Support the valve where necessary to reduce load on the piping (important on bigger valve and actuator assemblies).
  • For 2 way and 3way threaded valves (BVS, BVF8, BLS3) it will be necessary in metal pipework to allow for removal of the valve for maintenance by having a pipe union installed. 3 piece threaded and 2 piece flanged ball valves can be removed for maintenance without disturbing the pipework.
  • Tighten the bolts on a flanged valve one at a time doing it in stages so even pressure is applied and a seal is formed between the valve and flanges.
  • Once the installation is complete, operate the valve several times to ensure it is free from impingement and rotating through its full 90 degree operation.

Field Testing

  • Ball valves are designed to hold rated pressures only. Test pressures above rated working pressure in the closed position can cause damage to the valve.
  • With the ball in the open position the pipeline can be tested up to the valve hydrostatic test pressure.
  • Seat leakage can occur with foreign material between the seat and ball. If this occurs, open the valve 10 to 15 degrees to obtain high velocity flushing action. Close and repeat if necessary.
  • Seat leakage can result from a rotational shift in position of the ball in relation to the body. Readjust the closing stop on the actuator/gearbox as necessary.

Operation

  • Do not use the valve at pressures above its working pressure.
  • If the valve is jammed in a position between open and closed check the actuator operation. If necessary remove the actuator and manually operate the valve to fault find. Remove and check valves for foreign objects if required (see maintenance).
  • Excessive torque from the actuator can damage the internal valve parts.

Maintenance

  • Cycle the valve once a month or more if it is not used regularly.
  • Relieve the system pressure before maintaining the valve.
  • To remove from pipework reverse the installation sequence.
  • Replace valve seats and seals by removing the end plates. With the ball in the closed position press carefully push out the end seats and the ball. Avoid damage to the polished ball surface using a soft clean cloth to hold. Push the drive stem up from inside the cavity to expose the stem seals. Reinstall the seals, stem, ball, seats and end plates. Use only approved lubrication on the seals. Test and refit into line as in installation sequence.
  • For operational instructions please see each video link under products.

Design Guidance & Product Advantages

  • When sizing the valve always consider available space for the actuator and feedback devices.
  • Consider valve supports to carry excess loads.
  • Extension shafts in SS316 are available upon request. This allows the valve to be buried in pits and actuators to be above ground.
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What is valve Casting?

Casting does one of the earliest production methods use by many industrial organizations in the history of art and design. However, their uses and applications have a long and varied history, and they continue to play an important role in today’s artistic and industrial production areas. Casting is a quick and inexpensive way to give a metal (or other material) object the shape you want. The metal shapes created by the casting process may be complex designs that would otherwise involve a significant technological investment if done in any other way. Read this guide to learn more about casting, its types, advantages, and disadvantages. First, let’s have a look at what casting is.

Metal Pouring

What is valve Casting?

“Valve Casting is a manufacturing technique. In the casting process, a liquid material is added into a mold to get the desired item. The mold has a hollow space of the required shape. The liquid material in the mold is allowed to solidify. This solid part is called a “casting.” The liquid material present in the mold in solid form is ejected or broken out of the mold to finish the process.”.

Types Of Casting

3D Printing Investment Casting

Sand Casting

“This casting procedure uses a sand mold to create castings .”Sand casting can use to produce steel, iron, and most nonferrous alloys. The most common casting method, sand casting, uses disposable sand casting molds (The mold in sand casting is made up of Sand) to create intricate metal pieces in almost any alloy. However, sand casting has a poor production rate.

This is because to get the product; you must destroy the mold. Therefore, this method has a disadvantage compared to other methods in which the molds are reusable. The sand casting technique involves using a furnace, metal, design, and sand casting mold. First, the metal is heated in the furnace and poured into a sand casting mold. The solidified casting can be removed once the sand mold separates along a dividing line.

Foundry Mean

Die Casting

“To make a casting, a high-pressure metal liquid is forced into a precision metal mold cavity at fast speed, then cooled and solidified under pressure.”

Die casting is a production process. The molds used in this process are not wasted. They are reusable molds. These reusable molds are called dies. The die casting manufacturing process does use to make geometrically complex metal objects. A furnace, metal, mold(the mold in Die casting is made up of metal), die casting machine, and die are all used in the die casting process. Like sand casting, the metal does the heat in a furnace. Then, it does force into a die casting mold (dies). The metal heated in the furnace does aluminum or zinc (nonferrous). The molten metal feeds into the dies, where it cools quickly and hardens into the completed item, referred to as the casting.

Die casting molds consist of two halves with a cavity

The molten liquid melt is forced into this cavity during the casting process. The halves are mounted on a fixed and movable machine surface. The mold halves are subjected to a great deal of pressure throughout the casting process, which is why locks are included. Furthermore, specific areas of the die casting mold are cooled and/or heated in order for the casting to solidify as required.

Die Casting manufacturers are of two types:

  1. Hot Chambers Manufacturers –  These manufacturers can use alloys with low melting temperatures, for example, zinc.
  2. Cold Chambers Manufacturers can use alloys with high melting temperatures, for example, aluminum.
investment casting vs sand casting

Investment Casting

“Thousands of years ago, molten metal does pour into a disposable ceramic mold in a method known as investment casting .” In the modern age, there are many investment casting foundries where the investment casting process occurs. First, a wax pattern – a disposable component shaped like the intended part – can use to create the mold for investment casting.

After the pattern does melt into the mold, it can cover in a ceramic slurry. This “invests” in the design. Investment casting is also known as “lost-wax cast” because the wax pattern can remove from the mold. The lox-wax process is one-to-one, meaning that one pattern makes one item. This increases manufacturing time and costs. Because the mold does destroy during the manufacturing process, parts with intricate geometries or fine details can still make.

types of patterns in casting

Shell Mold Casting

“Shell mold casting is a metal casting sand process. In this casting process, molten metal is poured into a disposable mold of the desired shape”.
In shell mold casting, on the other hand, the mold is a thin-walled shell made by depositing a sand-resin mixture around a design. Multiple shell molds are made from the pattern, which is a metal piece shaped like the desired part. Higher manufacturing speeds are possible with a reusable pattern, whereas complex geometries are possible with disposable molds. A metal pattern, an oven, a sand-resin combination, a dump box, and molten metal are required for shell mold casting.

casting

Centrifugal Casting

“ It is a permanent mold procedure that fills a mold with molten material using centrifugal force.” This casting method is of three kinds.

  1. Centrifugal Casting
  2. True centrifugal casting
  3. Semi centrifugal casting

Their mechanism of the process is the same. Molten metal is poured into a bowl, from which it is centrifugally driven into the mold( rotating around an axis). The centrifugal force is the radially directed outward force on an object moving in a curved path. Alfred Krupp developed the centrifugal casting process in 1852. He used centrifugal casting for making railway wheels. By carefully controlling the metal and crystal structure, high-quality items can be produced utilizing this casting technique. These casting techniques are primarily employed to create rotationally symmetric items. This procedure does not produce the finished result; it takes some machining to achieve a fine finish.

Treatment of steel casting defects

Permanent Mold Casting

Permanent mold casting is a metal casting method. In this method, the mold can fill with molten metal and remains close until it cools and hardens into the desired shape. Permanent mold casting is similar to sand casting. Sand casting, on the other hand, uses a disposable mold that is thrown away after each cycle. Like die casting, permanent molds use metal molds (dies) that can be reused thousands of times and usually consist of steel or cast iron. In permanent molds, casting can also refer to as gravity die casting, in which case there is no external force to pour the molten metal into the mold.

Permanent mold casting does most often use to make small base metal parts with consistent wall thickness in large quantities. Alloys of aluminum, copper, and magnesium are the common non-ferrous metals used in this procedure. However, it can also use graphite molds to cast iron and steel.

Advantages Of Casting

Following are the advantages of castings which make it best among most manufacturing processes.

  1. Casting makes the item have extremely intricate form and internal hollows.
  2. It can use to create parts ranging in size from a few hundred kilos to a few kilograms (thousand of kilograms).
  3. Both non-ferrous and ferrous metallic elements do cast.
  4. It is cost-effective and waste-free since the excess metal from each casting is re-metalized and re-used.
  5. It is a process that is very adaptable to the needs of mass manufacturing, allowing for the rapid creation of vast quantities of a particular casting.
  6. Casting tools are more affordable and straightforward.
  7. Only castings can make certain metals and alloys.
  8. From casting, an exact object is created.
  9. The isotropic structure is created.
  10. Among all production methods, it is the most cost-effective.
  11. Casting can use to make composite components.

Disadvantages Of Casting

No doubt, casting is the most cost-effective method among all production methods, and exact objects can create from casting. But there are some disadvantages of this method. Following are the disadvantages of this method:

  1. Surface quality is relatively rough, requiring a wider tolerance and making mating interfaces unsuitable.
  2. Some metal casting processes have a limit in terms of size and pattern.
  3. Although additive manufacturing technologies such as binder jetting have recently been utilized to manufacture molds, patterns are time-consuming and expensive to create.
  4. Some casting processes are costly for medium runs.
  5. The size and substance of the part are determined by the casting method used. For permanent mold castings, for example, only non-ferrous metals are allowed.
  6. This method does hinder casting defects, for example, moisture in the sand.
  7. When compared to forging, it has lower fatigue strength.

Applications Of Casting

Let’s have a look at some applications of the casting process

General applications

The following are some examples of general casting applications.

  1. Parts made of cast iron are utilized at railway crossings.
  2. Transportation vehicles.
  3. Applications of atomic energy
  4. Generator of electricity
  5. Parts of railway crossings
  6. Turbine Vanes
  7. Agriculture parts
  8. Parts of communication
  9. Turbine at a power plant
  10. Parts for sanitary fittings.
  11. Engine block for a car
  12. Tool beds for machines
  13. Rolls for the mill
  14. Pipes for water and sewage.
  15. Engines for transport vehicles

Applications of Casting in the Automobile industry:

Components of complex shape and size were required in the vehicle industry. Other manufacturing methods are unable to make these pieces. Therefore, the casting process does use to make 60% of the components in an automobile. Because the strength of Casting components is greater than that of other manufacturing parts, strength is a critical attribute in automobiles.

  1. Cylinder Block
  2. Fuel Intake part
  3. Piston Ring
  4. Engine Components
  5. Parts of sunroof
  6. Transmission parts

Application of Casting in industries :

The casting technique can use to make a cylindrical hollow cylinder, a piston can use in automobiles, a pulley, engine manifolds, valves, nuts, and Defence equipment, among other products. Casting does utilize in various industries, including aerospace, Defence, automobiles, trains, construction, agricultural, mining, and chemical. It can also use to make home decor and ornaments.

  1. In transport industry: Shipping, aerospace, railways, automobile
  2. Households: Appliances, Kitchen equipment, fitting equipment
  3. Defense equipment: Vehicles, Artillery, Supporting equipment
  4. Plant equipment: Sugar mill equipment, Plastic industry, Paper industry, Thermal power plant, Petroleum industries
  5. Art object: Furniture, sculptures, idols
  6. Municipal casting: Valve, pipe, joints, and fittings
  7. Machine tools: plastics molding, forging, extrusion, and forming.

Conclusion

Valve Casting is an essential production technology that enables the manufacturing industry to make various items. Casting can do in various ways, including sand casting, die casting, investment casting, and more. We hope that this guide has given you a better understanding of the casting process and its benefits and drawbacks.

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What is a non-slam check valve?

To answer this question we must first consider the basic structure of a check valve. A check valve consists of two ports; an inlet for liquid or gas to enter the valve and an outlet for it to exit the valve. Within the chamber of the check valve is contained an opening and closing mechanism (valve disc). Therefore, liquid or gas can only pass through the valve in one direction, hence it is sometimes referred to as a non-return valve, one-way valve etc. When the liquid or gas attempts to flow backwards through the valve the disc will close or slam shut. The surge of the backflow hitting the closed disc can create a hydraulic shock or water hammer. Water hammering can cause problems such as pipe rupture, collapse or damage to pumping systems. To get around these problems, the non-slam check valve utilises an internal coiled spring downstream from the disc. So instead of relying on backward flow to close the valve, as the forward flow starts to slow, the valve is closed off with the spring mechanism, eliminating any backflow and the cause of the water hammer.

What-is-a-non-slam-check-valve

Applications of Non-Slam Check Valves

Typical applications of Non-Slam Check Valves would include:

  • Centrifugal Compressor Discharge
  • Reciprocation Compressor Discharge (Sizing is critical for this application)
  • Rapid Closure requirements
  • Low Pressure Drop Requirements
  • Salt Water Fire Safety Systems Critical Service
  • Desalination Reverse Osmosis Process
  • Critical Applications
  • Non Serviceable Locations *
  • High system deceleration applications
  • Elevate Valve Slamming applications
  • High Temperature critical applications
  • Cryogenic Application
  • Pulsating Flow Applications
  • Renewable Energy Hydrogen Service
  • Lethal Service **
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Top Industrial Valve Manufacturers To Consider In 2022

Top  Industrial Valve Manufacturers To Consider In 2022

The ranking of industrial valve manufacturers in China is continually rising over the past years. This is because of the increase in a lot of new Chinese suppliers in the market. These companies are catching up with the rapidly increasing demand within the country’s flourishing economy of industrial valves.

The demand for industrial valves in China has grown much larger compared to the combined demand in other countries in the world in 2006. This exceeded the capacity of international suppliers and are therefore largely served by domestic industrial valve companies. In fact, the largest industrial valve manufacturer in the world is China. You can check this article for the top valve manufacturers in China in case you are interested. 

In this article, we are going to present to you the top ten industrial valve manufacturers you should consider this 2020. These manufacturers not only have different valves, but also have high-quality strainers for sale. We have included one manufacturer located in China. We will briefly discuss each company and their offered products in the following sections.

Source: AVK

#1 AVK Group

AVK manufactures industrial monitoring and control systems for discrete and process industries. AVK’s division for flow control, known as AVK Valves, is manufacturing industrial valve varieties for the following industries:

  • Oil and gas,
  • Water treatment,
  • Paper and pulp,
  • Steel,
  • Chemical, and
  • Power generation.

The company also owns other subsidiaries engaging in valve manufacturing for specific segments of users.

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Source: Bel Valve

#2 BEL Valves

BEL Valves is a UK-based manufacturer specializing in high integrity and high-pressure valves for oil and gas industries. The company caters to pressures reaching 16,500psi in depths of water up to 3,000 meters. 

The British company’s clients include the biggest national and international companies around the world such as ExxonMobil, Chevron, Total, Shell, BP, and Saudi Aramco. What makes them unique from other industrial valve companies is that they manufacture the products in-house separate from the raw materials.

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Source: SLB

#3 Cameron (Schlumberger)

Cameron embarks in industrial products manufacturing including compression, processing, pressure control, and flow control systems. Aside from these, the company also offers services for aftermarket support and project consulting for oil and gas industries. Cameron is among the world’s leaders in systems for flow control. Their products include valves and automation technologies for valves that are exploited in oil and gas industries.

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Source: Emerson

#4 Fisher Valves & Instruments (Emerson)

Fisher Valves has over 130 years of service history after it was established in the United States. The giant company, Emerson, acquired the company many years ago. It has fortified its place as the world’s largest supplier and manufacturer of control valves for oil and gas industries.

According to them, the reason why they are better than other companies is that they take the valve’s internal parts to the care of experienced engineers. Also, they believe that they have developed the most advanced controls that go with the valve. This includes control and diagnostics and very fast opening. These capabilities are crucial for the operation of a whole plant.

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Source: Xhval

#5 XHVAL

XHVAL was founded in 1986 and is a manufacturer of industrial valves based in China. The company specializes in the manufacture of affordable industrial high-quality ball, butterfly, check, gate, plug, globe, and cast iron valves. They focus on providing high-quality service by manufacturing innovative valves intended for the chemical, oil and gas, and other industries. 

XHVAL offers a variety of industrial valves ideal for piping systems and energy service industries molded through constant innovation. In addition to this, they also provide customization of high-quality and world-class industrial valves to fit every application. This differentiates them from other competitors in the market. And to meet the global standards for industrial valves, the company gives continuous supervision and quality control to their products.

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Source: Pentair

#6 Pentair Valves and Controls

This company is part of the bigger Tyco conglomerate, a very diverse manufacturing company. Pentair Valves and Controls, previously known as Tyco Valves and Controls, is still among the largest valve manufacturers for oil and gas industries. The company’s headquarters in the Middle East has a strategic position to serve valves for the region. They claim that they are comprised of knowledgeable and experienced technicians worldwide to provide a quality service.

In addition, they also stated that their products are manufactured and designed to work reliably and safely under extreme pressures and temperatures in the oil and gas industry.

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Source: JC

#7 JC Valves

JC Valves is a Spanish-based manufacturer claiming to have many varieties of high technology and high-quality ball valves with competitive prices. The company does not only serve petrochemical and oil and gas industries. They also serve other industries needing valve products such as the power generation and chemical sectors.

JC Valves has a manufacturing plant that utilizes vacuum technology that essentially eliminates any impurities and gases during the phase of metal melting. This considerably enhances the product’s service life.

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Source: Petrolvalves

#8 PetrolValves

PetrolValves is one of the leading industrial valve manufacturers established in 1964. It became a leader in the Subsea Market in the 1970s for the development of dedicated products such as:

  • Swing check valves,
  • Wedge gate valves,
  • Ball valves, and
  • Slab gate valves.

The company developed its first ball valve with a metal-to-metal sealing and opened branch offices around the world to reinforce its commercial network in the 1990s. PetrolValves’ purpose, according to them, is the safe and efficient delivery of solutions for flow control that suit the requirements of their global customers in the oil and gas industry. 

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Source: Valvitalia

#9 Valvitalia

Valvitalia is an Italian valve manufacturer including various energy equipment. They claim to have the following which differentiates Valvitalia from its competitors.:

  • A large inventory,
  • Experienced management,
  • Performance,
  • Quality, and

Full commitment to their customer’s satisfaction.

Valvitalia currently supplies products in Oman, Qatar, United Arab Emirates, and Saudi Arabia. The company manufactures a wide variety of products including all kinds of actuators, valves, flanges, fittings, and gas equipment.

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Walworth logo

 #10 Walworth

Walworth covers the Middle Eastern territory with ValveTech as the company’s distributor for the whole region. The company was established in 1842 and has dedicated to the design and manufacture of various fluid control valves. 

Walworth is among the world’s oldest manufacturer of valves influencing the Mexican market and offers a variety of specialized valves cast using API standard steels. 

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Conclusion

There are hundreds of valve manufacturers and suppliers around the world. This gives you a wide array of varying options when choosing a flow control valve for your application. With the continuous rise of new industrial valve manufacturers, these companies are pressured to keep the production of valves with very high standards. This makes choosing the right valve manufacturer for your needs more challenging.

Speaking of, this article discusses the basics of industrial valve selection in case you are interested. That’s it! Hopefully, this article has helped you choose your ideal valve manufacturer.

 

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