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What Is Trunnion Ball Valve?

A crucial tool for controlling the flow of liquids, gas, steam, or oil in a pipeline is the Trunnion ball valve. The device has a quarter-turn design with a ball that can bend 90 degrees to obstruct or permit liquid flow. To control the begin-halt flow cycle, these valves have a spherical disc design in the middle that revolves.

The disc, which is frequently referred to as a ball, is made with a thin, mechanically supported shaft projecting from the top and bottom. The location of a hole in the middle of the ball regulates flow. Trunnion mounted ball valves are helpful in applications where shut-off function is necessary because of their adaptability.

The support for the ball in the Trunnion ball valves is sufficient. The support, which resembles a shaft in shape, is known as a trunnion. The Trunnion absorbs any extra pressure created by the flow, reducing the pressure on the seat of the valve and ball. Ball valves placed on Trunnion are employed in large-scale applications mandating little operating torque.

Parts Of A Trunnion Ball Valve 

trunnion mounted ball valve trim

The Trunnion-mounted ball valves resemble the common ball valves in terms of structure. The design of the trunnion-mounted ball valve features mechanically supported, gloomy tended shafts at its top and bottom. This enables it to be utilized at high pressures and massive diameters.

Different types of Trunnion ball valves are produced, and you can acquire them from a reliable valve manufacturer in china. The seat rings at the two extremities of the Trunnion design are condensed to keep the ball in place. Here are the different parts of Trunnion ball valves.

  • Body 

The ball valve’s body is the casing that supports the inside of the valve and keeps it in place. Based on the function it will receive, the substance for this design may be constructed of various products. Carbon steel, stainless steel, duplex, low-temperature carbon steel, Inconel, and super duplex are a few of the materials that are frequently utilized.

  • Ball

It rotates through a disc with a sphere-like form to halt or start flow in a steady rotation. On one end, it is attached to the Trunnion, and on the other, to the stem. While it takes turns, the ball is secured in place. The seats of the Trunnion ball valve frequently get into touch with this ball, lowering the torque.

  • Seat 

The Trunnion ball valve’s seat is a design element that encircles the ball. The seats hold the ball firmly in place when the actuator is switched on, preventing access. There are two varieties: soft and metal, which causes it to move in the ball’s general direction.

  • Trunnion

The trunnion ball valve has an additional shaft that holds the ball in place from below, which is called Trunnion. Its purpose is to maintain the ball’s tight attachment. In some Trunnion mounted ball valves, the Trunnion is an attachment of the spherical ball, and the rest of the time, it is connected to the spherical ball disc through welded joints.

  • Stem

The ball and the actuator are connected by the trunnion ball valve’s stem. It is attached to the ball by an extra shaft, which aids in keeping the ball firmly in position. Additionally, it controls how the ball moves. Trunnion-mounted ball valves retain stronger anti-blowout stems, which allows them to withstand high pressures and temperatures without suffering any harm.

  • Disk

A perforated, solid ball is the shape of the disc in a Trunnion ball valve. The ball is attached to the stem on one side, and on the other, to the Trunnion. The ball or disc in a Trunnion ball valve is stabilized while it revolves. Because the seats are always in touch with the ball, torque is decreased.

  • Actuator

A trunnion ball valve’s actuator is utilized to open or shut down the valve. Based on the application and medium, like air-operated ball valves, numerous types of actuators are utilized in ball valves. On a valve, typical actuators include bare stems, hand levers, pneumatic actuators, gears, and hydraulic actuators. Additionally, you can utilize a motor-operated actuator, a hydraulic-operated actuator, an electric actuator, a gas actuator, gas-over-oil actuator, and more.

  • Injection

In the seat and stem region, injection fittings are created. Grease can be inserted using a sealant injection fitting when sealing is weakened, and leakage starts. A partial seal is created by the injected sealant to halt additional leaking. The sealant injection fittings are only to be utilized in emergencies.

How Do Trunnion Mounted Ball Valves Work?

Trunnion ball valves are simply 90-degree turn valves. It implies that to swing the valve on or off, the actuator must be slanted at a 90-degree angle. The ball pivots after the actuator are turned, allowing the medium to flow freely because the bore is towards the pipeline. By turning the handle one more time, the ball is moved so that the bore of the ball meets away from the pipeline, halting the flow.

For instance, you need to control the flow of oil through a crucial procedure component. To complete the task, install a three-piece, split-body, or half-bore ball valve. You must rotate the valve’s actuator 90 degrees in one direction to begin the flow of oil, normally clockwise.

The ball is attached to the valve stem, which is related to the actuator. The ball is also moved by the stem’s rotation, so the side bearing the bore encounters the pipeline. Due to the half-bore valve’s restriction on oil flow, the stream’s flow pressure is reduced.

Rotate the actuator once more to halt the flow, shifting the ball and stem simultaneously. Now that the ball’s bore is turned away from the pipeline and the flow is impeded. The seats of the valve are shoved closer to the ball by the upstream pressure, creating a strict seal.

Even modest pressures can force the seats of a Trunnion-mounted ball valve against the ball because of its spring-loaded design. The oil flow is stopped by this closed seal, which also prohibits oil from penetrating the valve’s interior components.

Trunnion ball valves are employed in high-pressure and low-pressure systems. The Trunnion absorbs any additional pressure on the seats and ball in high-pressure settings, allowing the valve to retain its torque. The valve’s spring-loaded seats shift toward the ball in low-pressure conditions to create a tight seal.

Advantages Of Trunnion Ball Valve

Here are the primary advantages of the Trunnion ball valve.

  • Less Torque 

A Trunnion, or lower stem, is utilized in a Trunnion ball valve to support the ball inside the valve body. The trunnion stem prevents unreasonable friction between the ball and seats by absorbing the thrust from the line pressure. As a result, even at the maximum working pressure, operational torque is kept to a minimum.

  • No Size Limit

Trunnion ball valves come in a wide range of sizes. Large-sized balls can fit into two-piece and three-piece ball valves, making them ideal for bigger applications. Tinier, low-pressure applications can make use of one-unit Trunnion ball valves. These ball valves are appropriate for important applications because they can deal with high-pressure operations.

  • Spring-Loaded Seats

Trunnion ball valves have spring-loaded seats. In addition, these Trunnion mounted ball valves are efficient in low and high-pressure conditions. The spring-loaded seats function for high-pressure applications as well as little or no pressure circumstances, forming a seal.

  • Customizable Features 

They retain a wide range of value-added characteristics. To make the seats and the ball more durable and ensure a tight seal, injections might be utilized. Corrosion-resistant nuts and bearings can be utilized to extend the valve’s life. It is possible to equip massive valves with lifting lugs.

  • Self Relief Pressure

The seat is originally electrified by the springs in Trunnion ball valves with cavity relief. However, the primary sealing force is provided by the line pressure disparity between the seat and the cavity. In order for the pressure to pile up and to plug the valve at downward pressure, the springs initiate a seal.

When the cavity pressure and line pressure are equal, the only thing generating the seal is the load provided by the springs, which is all the cavity pressure has to overpower for cavity relief. The valve will always release to the side with low pressure if there is enough cavity overpressure.

  • Ease of Operation

The Trunnion and stem of the valve are designed to withstand any additional pressure. It indicates that a smaller actuator and lower working torque are required for the valve. As a result, costs are decreased, and using the valve is simplified. Three-piece Trunnion ball valves are also simple to fix, maintain, replace, and clean because only a single piece needs to be taken off to get to the valve’s functional components.

  • Compliance

A Trunnion ball valve complies with a number of different industry standards and is planned in accordance with API608 or API 6D. The Trunnion valve’s basic design, size, and testing standards are provided by API 6D. Additionally, the API 6D standard specifies the Trunnion ball valve standard weights for various body and bore diameters.

  • Double Block and Bleed Capabilities 

Trunnion ball valves’ ability to double block and bleed is one of their distinguishing characteristics. A double block and bleed valve can be created using several Trunnion ball valves. A two-piece or three-piece trunnion ball valve can also have a bleed body added to it to help with sealing. It is possible to rinse the valve under pressure and check that the seats are correctly sealing, thanks to the double block and bleed feature.

Disadvantages Of Trunnion Ball Valve

Here are the primary disadvantages of the Trunnion ball valve.

  • A Trunnion ball valve is challenging to fix in-line because of the way it is entirely welded or bolted together. Repairs have the potential to highly obstruct regular pipeline systems.
  • If essential maintenance is not done, welded parts may start to operate with more friction, which could reduce efficiency.
  • Another main disadvantage is the expensive costs associated with these valves.

Applications Of Trunnion Ball Valve

Trunnion ball valves are highly regarded for their remarkable versatility because they can be used in both small-scale and large-scale, high-pressure and low-pressure applications. These ball valves can also be utilized in a wide range of sectors, thanks to their adaptable characteristics, simplicity of use, outstanding durability, and numerous other advantages.

  • Oil and gas sectors 

Trunnion ball valves are ideal for a variety of applications in the oil and gas sectors. Gas feed lines, industrial gas processing plants, field gas plants, oil refinery feedstock lines, and crude oil plants are a few models of oil and gas businesses that utilize Trunnion-mounted ball valves.

  • Chemical industries

Trunnion ball valves are ideal for a range of chemical sectors because they provide exceptional safety, reliability, and sealing capacities.

  • Pipeline industries

Trunnion ball valves are extremely useful in the pipeline business since they can deal with a variety of applications, including handling gases, slurries, and fluids.

  • Power Industries

Trunnion ball valves can be utilized in a wide range of power industry applications, including those involving turbines, generators, skids, and compressors.

  • Hydrocarbon industries 

Trunnion-mounted ball valves are quite common in the hydrocarbon sectors because they help make the processing of hydrocarbons easier.

Conclusion

Due to their adaptable properties, Trunnion mounted ball valves are particularly versatile and employed in a wide range of sectors. These valves are primarily employed in the LNG, petrochemical, oil and gas, and chemical industries.

For low temperature, high pressure, and large-scale applications, they are ideally suited. Does your business require a bulk quantity of Trunnion mounted ball valves for industrial purposes? In that case, make sure to contact a reliable valve manufacturer to get customized Trunnion-mounted ball valves that meet your business requirements.

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Different Types of Ball Valve Seats

In this ball valve seat material selection guide, consumers will explore the basics of ball valve seat design. By learning the fundamentals of ball valve seat design, consumers are able to make an informed decision that ensures safe and reliable operation.

What is a Ball Valve Seat?

A ball valve seat is a critical component of a ball valve that provides a tight seal when the valve is in the closed position. It consists of two parts: the ball and the seat. The seat is typically made from either plastic or metal and can be designed to fit different diameters of pipes. The seating surface is usually highly polished, allowing for an effective seal when the ball is inserted into it.

Ball valves are used in many different applications, ranging from controlling water flow to regulating pressure in gas systems. In order to ensure that these valves operate effectively, a properly functioning ball valve seat design must be selected and installed. When the ball is closed, the seat creates an airtight seal, preventing any leakage of the medium being controlled.

Different Types of Ball Valve Seats

There are various types of ball valve seats available on the market today, each designed to meet specific needs.

Soft Seats

Soft Seats are one of the most common types of ball valve seats used in today’s industry as they provide better sealing and longer life cycles. Generally, these ball valve seat material is made from a synthetic elastomer, which provides excellent sealing capabilities. Their large seating surface area also helps to preserve their sealing capability over time.

Metal Seats

Metal Seats are a type of ball valve seat commonly used in industrial settings. They are often made of stainless steel, brass, or chrome-plated materials and have a high degree of strength and durability. Metal seats are typically resistant to corrosion and can handle higher temperatures than other valve seat materials.

Graphite Seats

Graphite seats are known for their superior wear resistance, which makes them ideal for applications that require frequent operation or cycling. Graphite seats also offer better sealing pressure than other seat materials.

Graphite is an alloy made up of 85% carbon and 15% natural graphite, brass powder, and ebonite. This creates a strong yet flexible material that will provide a reliable seal in harsh conditions.

PTFE Seats

PTFE seats are a type of seat used in an industrial ball valve, which are the primary component of water and gas pipelines. PTFE is a unique material that offers excellent chemical resistance, electrical insulation, and a low coefficient of friction. It is also highly temperature resistant and can handle temperatures ranging from -400°F to 500°F (-240°C to 260°C). Furthermore, it is completely non-porous, making it ideal for high-pressure applications.

Nylon Reinforced Seats

Nylon-reinforced seats are the most durable ball valves and are used for high-pressure applications. They are two-piece split body ball valves made of stainless steel or other corrosion-resistant metals with a nylon-reinforced seat. Nylon-reinforced seats offer excellent corrosion resistance and have the highest pressure rating among all materials used in ball valves, typically achieving a working pressure range of up to 2,000 psi.

Ceramic Seats

Ceramic ball valve seats can provide an excellent seal against water, gas, steam and other fluids. They are often preferred over other materials due to their ability to withstand heat, corrosion, abrasion and damage from harsh chemicals. Ceramic ball valve seats are made from a combination of ceramic and metal components that form a hard and durable material.

Considerations of Choosing Ball Valve Seat Design

When considering a ball valve seat design, there are several important considerations to bear in mind. It is essential that the selected valve seat material can withstand the specified pressure rating and any surges.

cast steel ball valve

Compliance With Industry Standards

When selecting a ball valve seat design, it is important to consider the various industry standards that are in place. Different valves companies have specific requirements for ball valves, so it is important to ensure that the chosen design complies with all applicable standards.

Pressure and Temperature Requirements

Pressure and temperature can impact the durability of the seat as well as its ability to perform its desired function. The pressure rating of a ball valve seat is largely determined by its construction material. It is important to select the correct pressure rating for a valve seat based on the application requirements.

Temperature requirements, on the other hand, must also be taken into account when selecting a ball valve seat material. Different materials will have different degrees of resistance to extremes in pressure and temperature, so it is important to choose the right material to ensure that it can withstand the operating conditions.

Material Selection and Compatibility

The valve seat should be chosen based on the fluid environment in which it will be used. The material chosen for the valve seat should withstand corrosion and other environmental factors that could potentially cause damage or failure.

The choice of the material should also take into account any potential chemical interactions between the seat material and the fluid passing through it. Materials that are compatible with the surrounding environment must be selected -certain materials may react with the fluids and cause corrosion or other damaging effects.

Rangeability, Flow Capacity and Accuracy Requirements

Rangeability determines how wide of a range of flow rates a ball valve is capable of handling. Flow capacity is the maximum flow rate that can be reliably handled by the ball valve, and accuracy requirements will determine whether a more precise or less precise design is needed with respect to flow control.

Flow capacity is typically determined by the bore size and pressure rating of the ball valves. The larger the valve bore, the greater the flow capacity that can be achieved. Higher pressure ratings mean higher flow capacities, and the design must take into consideration both the system’s operating pressure and maximum pressure requirement.

Size Restrictions and Pressure Drop Considerations

Size restrictions are determined by the application – for example, if the application requires access through a small opening, a smaller valve size may be needed to fit the space. Ball valves really work with butterfly valves. Pressure drop considerations involve understanding how much pressure will be lost from the opening of the ball valve and across the seat.

It will depend on the fluid flow rate and the pressure differential between two points when considering a specific ball valve size and configuration. Additionally, it’s important to choose a reliable ball and butterfly valves supplier who can provide high-quality valves that meet a specific requirements.

Leakage Control and Sealability

One of the most essential considerations when selecting a ball valve seat design is its ability to provide effective leakage control and sealability to guarantee the safe and reliable operation of the system. There are various seat materials and designs available, each providing its own unique benefits, so careful consideration should be given to which choice is best for the specific system requirements.

Cost-Effectiveness

The choice of materials for the seat should be based on criteria such as operating conditions, chemical compatibility, temperature range and corrosion resistance. A combination of materials may be needed to provide the ideal combination of stiffness and hardness for the application. In addition to material considerations, other factors that influence cost include valve size and pressure class, type of actuation, use of resilient seals and lubrication requirements.

Conclusion

Ultimately, the key to choosing the right seat is to understand the requirements for each project, select the proper materials for construction, and follow a rigorous quality assurance process. By considering all of these elements, designers can find the perfect seat for their ball valves.

Consumers should understand the different types of seats available and the considerations that need to be taken into account when choosing a seat for an application including a reputable industrial valves supplier.

 

STV is an industrial valve company that has been serving the industry for more than 20 years. The company produces a wide variety of valves, from ball valves, globe valves, butterfly valves, and much more. Their products are used in numerous industries such as water treatment, oil & gas, power generation, petrochemical, and many more.

STV also offers custom-designed valves to meet the specific needs of its customers. Contact STV   today for a customized ball valve seat design for any applications!

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What’s the Difference Between a Gate Valve and a Globe Valve?

gate valve

A gate valve and a globe valve are two types of valves that use liquids as their medium of motion. Their functions may be similar, but the way they operate differs significantly. Read on to learn more about these valves and their differences so one can make the right choice when it comes time to purchase one or the other. To help clarify any confusion, we’ve listed the main differences here to determine which type of stv valve may be better suited to the specific application.

What Is A Gate Valve?

A gate valve is used to control the flow of liquids and gasses. It is a versatile valve that can be used in various residential and industrial applications. Gate valve manufacturers offer these valves in multiple sizes and materials, making them suitable for different applications.

Gate valves are designed to be durable and reliable, offering several advantages over other types of valves. They are easy to operate and require little maintenance, making them a good choice for many applications. Gate valves are also less likely to leak than other valves, making them ideal for use in applications where leaks could be a problem.

gate valve

china-gate-valve-manufacturer/

What Is A globe Valve?

A globe valve is a type of valve used to stop the flow of liquid or gas in a system. It is usually installed at the end of a pipeline or section of piping. globe valves are often used in household plumbing systems to shut off the water supply to a fixture such as a sink or a toilet. They are also used in industrial and commercial applicationsto shut off the flow of liquids and gasses in a pipeline and best valves for oil and gas.

 

Difference Between a Gate Valve and a globe Valve

There are many types of valves used in plumbing and other industries. Two of the most common types are gate valves and globe valves. But what is the difference between these two types of valves? So, let’s discuss the difference based on the features and specifications of both valves.

How It Works

Gate valves are used to control the flow of liquids and gasses. They are often used in piping systems to regulate the flow of water or other fluids. On the other hand, stop valves are used to shut off the flow of liquids or gasses. They are often used in emergencies to shut off the flow of a substance quickly.

Structure

Gate valves have a gate that opens and closes to control the flow of liquids or gasses. The gate is usually made of metal or another durable material. Stop valves have a plug inserted into the valve’s opening to shut off the flow of liquids or gasses. The plug is usually made of rubber or another soft material. The main difference between gate valves and stop valves is their structure. Gate valves have a gate that opens and closes, while stop valves have a plug inserted into the opening.

The gate valve is more complicated than the stop valve and has a greater height dimension. The gate valve appears shorter and taller than the stop valve. Particularly the rising stem gate needs more height.

Sealing surface

The sealing surface on the gate valve is self-sealing. The valve core is tightly connected to the sealing surface at the valve seat, so it does not leak. To achieve sealing, the sealing surface must be sealed by force.

Rheostat

The entire flow path is apparent when the gate valve is fully open. This reduces the operating pressure loss for the medium. It has a lower flow resistance than the stop valve.

Direction of flow

The flow direction of the gate valve is the same in both directions. The installation of an outlet and inlet direction is not required. The medium can flow in both directions. The direction of the arrow on the valve body should direct the stop valve. The direction of the stop-valves inlet and outlet is clearly defined. The flow direction of the stop-valves should follow the three chemical supplies of  China’s industrial valves.

The cut-off valve has a low inlet and a high outlet. The pipeline is not located on the same horizontal phase as the pipe. The flow path of the gate valve is horizontal. The stroke of a gate valve is longer than that of a stop valve.

Working Principle

The stop valve opens and closes with a rising stem. This means that the handwheel rotates and rises and falls with the stem. The valve stem is made to rise and fall by rotating the gate valve, but the position of its handwheel remains the same. Different flow conditions exist, and the flow is different. The inlet and outlet directions for the stop valve are specified.

The inlet and outlet requirements for the gate valve are not required. The gate valve can be fully or partially closed. The gate valve’s opening and closing strokes are large, and the closing and opening times are long. The stroke of the globe-valve valve plate is more diminutive. Additionally, the globe-valve plate can be stopped at a specific place during flow regulation movement. The gate valve is only used for cut-off.

Performance Differences

Gate valves are designed to allow for a smooth, uninterrupted flow of fluid or gas. They do this by opening and closing a circular gate in the center of the valve. When the gate is open, fluid can flow freely through the valve. When the gate is closed, the flow of fluid is stopped.

How To Choose Between Gate Valve And A globe Valve?

Alt-text: How To Choose

There are a few factors to consider when deciding between a gate valve and a stop valve for needs. Here are five factors to keep in mind:

1. Functionality: Gate valves are typically used for applications where a large volume of fluid needs to be quickly shut off. They are also often used in applications where the fluid is highly viscous or contains solids, as the gate can seal against these without issue. On the other hand, stop valves are better suited for applications where precision is critical. This is because stop valves can be slowly opened or closed, allowing more control over the flow rate.

So, when deciding between a gate valve and a globe valve, one should consider the volume of fluid that needs to be controlled, the precision required, and the properties of the liquid.

The answer depends on the specific needs. What’s the need to do? A globe valve may be a better option if needed, a valve that can be opened and closed quickly. A gate valve may be a better option if needed, a valve that can be adjusted to regulate flow.

2. Pressure: Pressure is essential for two main reasons. First, it affects the amount of force required to operate the valve. A higher pressure requires more force, while a lower pressure requires less force. Second, pressure affects the seal on the valve. A higher pressure tends to cause a tighter seal, while a lower pressure can cause a leaky seal.

When choosing between a gate valve and a stop valve, then consider the system’s maximum operating pressure. The maximum operating pressure is the highest pressure that the system can safely handle. If the maximum working pressure is exceeded, there is a risk of damage to the system or injuries to people using it. Gate valves are high-pressure valves, while stop valves can be used for both high and low-pressure applications.

3. Cost: There are many factors to consider when choosing between a gate valve and a stop valve, but the cost is often one of the most important. Gate valves are typically more expensive than stop valves, but they offer several advantages that may make them worth the extra cost. For example, gate valves are less likely to leak and provide a tight seal that can help prevent water damage. If cost is a significant consideration, compare the prices of both types of valves before making a decision.

4. Maintenance: When choosing between a gate valve and a stop valve for the industrial process, it is essential to consider the maintenance requirements of each type of valve. Gate valves require more frequent maintenance than globe valves, as the moving parts of the gate valve are more likely to wear down over time. On the other hand, globe valves have fewer moving parts and thus require less maintenance.

5. Installation: When choosing between a gate valve and a stop valve, it is essential to consider the ease of installation. At the same time,globe valves are typically much easier to install, especially in tight spaces. On the other hand, gate valves can be more challenging to install, but they are often the better choice for specific applications.

6. Material: One of the most important is the material the valve will be made from. Depending on the application, one material may be better suited than another. For example, if the valve is exposed to high temperatures, a material like stainless steel valve may be a better choice than brass.

Bottomline

In conclusion, there are several critical differences between gate valves and stop valves. Gate valves are designed to allow or prevent flow, while stop valves are designed to control pressure. Gate valves are generally more durable and reliable, making them the better choice for most industrial applications. If unsure which type of valve is required for application, contact us, and we will be happy to help to choose the correct valve for the job.

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