High-Performance Bellows Seal Globe Valve for Zero Leakage Industrial Applications
High-Performance Bellows Seal Globe Valve for Zero Leakage Industrial Applications
The ANSI Bellows Seal Globe Valve, Class 300LB, ASTM A216 WCB, 3 Inch, RF End is a premium industrial valve designed for zero stem leakage, accurate flow regulation, and long-term operational reliability. Featuring a welded stainless steel bellows seal, this valve eliminates fugitive emissions while providing superior sealing performance compared to conventional packed globe valves.
Manufactured from ASTM A216 WCB carbon steel and engineered according to BS 1873, ASME B16.34, ASME B16.5, and API 598, this valve is widely used in steam systems, thermal oil plants, refineries, petrochemical facilities, power stations, chemical processing plants, LNG terminals, and industrial utility pipelines.
At STV Valves, we manufacture high-quality Bellows Seal Globe Valves for customers worldwide, offering customized materials, pressure classes, trim options, and actuator solutions.
Why Choose a Bellows Seal Globe Valve?
Industrial facilities handling steam, thermal oil, toxic gases, hazardous chemicals, or expensive process fluids cannot tolerate stem leakage. Conventional globe valves rely solely on graphite packing around the valve stem, which gradually wears during repeated operation.
A Bellows Seal Globe Valve incorporates a precision-welded stainless steel bellows that creates a permanent pressure barrier between the process fluid and the atmosphere. This significantly reduces maintenance, improves environmental protection, and extends valve service life.
Key Benefits
- Near-zero stem leakage
- Excellent fugitive emission control
- Long bellows fatigue life
- Accurate throttling performance
- Reliable shut-off capability
- Lower maintenance costs
- Improved plant safety
- Extended valve service life
Product Specifications
| Item | Specification |
|---|---|
| Product Name | ANSI Bellows Seal Globe Valve |
| Valve Type | Bellows Seal Globe Valve |
| Nominal Size | 3 Inch (DN80) |
| Pressure Rating | ASME Class 300 (300LB) |
| Body Material | ASTM A216 WCB |
| Bonnet Material | ASTM A216 WCB |
| Bellows Material | Multi-Ply SS316L Stainless Steel |
| Stem Material | ASTM A182 F6a / SS410 |
| Disc Material | WCB + 13Cr / Stellite Overlay (Optional) |
| Seat Material | Integral Seat / Stellite Hard-Faced |
| Packing | Flexible Graphite (Secondary Seal) |
| End Connection | RF Flanged End |
| Flange Standard | ASME B16.5 Class 300 |
| Design Standard | BS 1873 |
| Face-to-Face | ASME B16.10 |
| Pressure Design | ASME B16.34 |
| Inspection & Testing | API 598 |
| Operation | Handwheel (Pneumatic, Electric & Gear Optional) |
What Is a Bellows Seal Globe Valve?
A Bellows Seal Globe Valve is designed to prevent leakage around the valve stem by replacing the traditional packing-only seal with a welded metal bellows.
During operation:
- The handwheel rotates the valve stem.
- The stainless steel bellows expands or contracts together with the stem.
- The process fluid remains completely isolated inside the valve body.
- Graphite packing acts as an additional backup seal.
- The globe valve provides excellent throttling and shut-off performance.
This dual sealing structure makes bellows seal valves the preferred choice for hazardous and environmentally sensitive applications.
Main Features
Zero Fugitive Emissions
The welded bellows completely isolates the process medium from the atmosphere, minimizing environmental pollution and complying with strict emission regulations.
Precision Flow Regulation
Unlike gate valves, globe valves are specifically designed for throttling applications.
Advantages include:
- Stable flow control
- Accurate regulation
- Excellent sealing
- Low vibration
- Smooth operation
High-Strength WCB Body
ASTM A216 WCB carbon steel provides:
- Excellent pressure resistance
- High mechanical strength
- Good weldability
- Outstanding durability
- Cost-effective performance
Multi-Layer Stainless Steel Bellows
The precision-formed SS316L bellows offers:
- High fatigue resistance
- Long operating life
- Excellent corrosion resistance
- Reliable sealing under repeated cycling
Secondary Packing Protection
In addition to the bellows, graphite packing provides an extra sealing layer, ensuring maximum operational safety even under demanding conditions.
Advantages Compared with Standard Globe Valves
| Feature | Bellows Seal Globe Valve | Standard Globe Valve |
| Stem Leakage | Nearly Zero | Possible Over Time |
| Fugitive Emissions | Extremely Low | Higher |
| Maintenance | Minimal | Regular Packing Adjustment |
| Environmental Protection | Excellent | Standard |
| Service Life | Longer | Normal |
| Operating Safety | Higher | Standard |
Although bellows seal valves have a higher initial cost, they significantly reduce maintenance expenses and environmental risks over the valve’s lifetime.
Typical Applications
Steam Systems
Ideal for:
- Boiler systems
- Steam distribution
- Condensate recovery
- Turbine auxiliary piping
Petrochemical Industry
Suitable for:
- Hydrocarbon processing
- Solvent handling
- Refinery utilities
- Process pipelines
Chemical Processing
Widely used for:
- Corrosive liquids
- Toxic chemicals
- Organic solvents
- Process control systems
Thermal Oil Systems
Provides reliable shut-off and flow regulation in high-temperature heat transfer applications.
LNG & Industrial Gas
Excellent for controlling natural gas, nitrogen, hydrogen, and other industrial gases where leakage control is essential.
Power Generation
Used in:
- Feedwater systems
- Steam pipelines
- Cooling systems
- Auxiliary process lines
Available Options
STV Valves offers customized configurations including:
- Electric Actuator
- Pneumatic Actuator
- Gear Operator
- Locking Device
- Position Indicator
- Stellite Trim
- Bellows Life Cycle Test
- Low Emission Packing
- Fire Safe Design
- Cryogenic Extension Bonnet
- NACE MR0175 Compliance
- ISO 15848 Low Fugitive Emission Design
- EN 10204 3.1 Material Certificate
- Third-Party Inspection (SGS, BV, DNV, TÜV)
Quality Assurance & Inspection
Every valve manufactured by STV Valves undergoes comprehensive quality inspection before shipment.
Testing includes:
- Hydrostatic Shell Test
- Seat Leakage Test
- Bellows Leak Test
- Air Pressure Test
- Backseat Test
- Positive Material Identification (PMI)
- Dimensional Inspection
- Final Functional Test
All inspections comply with API 598, ASME B16.34, and customer project specifications.
Why Choose STV Valves?
STV Valves is an experienced industrial valve manufacturer serving customers in the oil & gas, petrochemical, power generation, chemical, marine, mining, and water treatment industries.
Our Main Products
- Bellows Seal Globe Valves
- Globe Valves
- Gate Valves
- Ball Valves
- Check Valves
- Butterfly Valves
- Knife Gate Valves
- Y Strainers
- Basket Strainers
Available Materials
- ASTM A216 WCB
- ASTM A351 CF8 / CF8M
- ASTM A352 LCB
- ASTM A217 WC6 / WC9
- Duplex Stainless Steel
- Super Duplex Stainless Steel
- Titanium
- Hastelloy C276
- Monel
- Inconel
Our products are exported worldwide and manufactured according to API, ASME, DIN, EN, ISO, and customer-specific standards.
For technical support or a customized quotation, visit www.stvvalves.com.
Frequently Asked Questions (FAQ)
What is the purpose of a bellows seal?
A bellows seal prevents leakage around the valve stem by creating a welded metal barrier between the process fluid and the atmosphere, reducing fugitive emissions and improving safety.
Why choose a WCB bellows seal globe valve?
ASTM A216 WCB offers excellent strength, durability, and cost-effective performance for steam, oil, gas, and general industrial services.
Can this valve be used for throttling?
Yes. Globe valves are specifically designed for precise flow regulation and shut-off, making them ideal for control applications.
What industries commonly use bellows seal globe valves?
Power generation, petrochemical, chemical processing, refineries, pharmaceutical plants, LNG terminals, district heating, and industrial steam systems.
Which international standards does the valve meet?
This valve can be manufactured to BS 1873, ASME B16.34, ASME B16.5, ASME B16.10, API 598, ISO 15848, and customer project requirements.
Why This Product Is Ideal for Industrial Projects
The ANSI Bellows Seal Globe Valve, Class 300LB, WCB, 3 Inch, RF End combines robust carbon steel construction with advanced bellows sealing technology to deliver zero stem leakage, precise flow control, and exceptional operational reliability. It is an ideal solution for industries that prioritize environmental protection, process safety, and long service life.
Whether installed in a power plant, refinery, chemical facility, or steam distribution network, this valve provides dependable performance while reducing maintenance costs and helping facilities comply with increasingly strict environmental regulations.