Descrizione
Bellows Sealed Globe Valve Flanged, 10 Inch, Class 300LB
IL Bellows Sealed Globe Valve Flanged, 10 Inch (DN250), Class 300LB is a premium industrial valve engineered for zero stem leakage, precise flow regulation, E long-term reliability in demanding industrial applications. Designed with a multi-layer stainless steel bellows seal, this valve completely isolates the process fluid from the atmosphere, significantly reducing fugitive emissions while ensuring safe and efficient operation.
Manufactured in accordance with BS 1873, ASME B16.34, ASME B16.5, E API598, this 10 Inch Bellows Sealed Globe Valve is widely used in power plants, refineries, petrochemical facilities, LNG terminals, thermal oil systems, chemical processing plants, offshore platforms, and industrial steam pipelines.
As a professional Bellows Sealed Globe Valve Manufacturer, STV Valves supplies high-quality flanged globe valves in carbon steel, stainless steel, alloy steel, duplex stainless steel, and special alloy materials to customers worldwide.
Why Choose a Bellows Sealed Globe Valve?
Traditional globe valves rely on graphite packing around the valve stem to prevent leakage. Over time, repeated valve operation can wear the packing, increasing the risk of fugitive emissions and product loss.
UN Bellows Sealed Globe Valve uses a precision-welded stainless steel bellows to create a permanent pressure barrier between the process media and the environment, providing a much higher level of sealing reliability.
Key Benefits
- Virtually zero stem leakage
- Excellent fugitive emission control
- Reliable shut-off performance
- Accurate throttling capability
- Long bellows fatigue life
- Reduced maintenance requirements
- Enhanced environmental protection
- Lower total cost of ownership
Product Specifications
| Item | Specifica |
|---|---|
| nome del prodotto | Bellows Sealed Globe Valve |
| Tipo di valvola | Bellows Sealed Globe Valve |
| Nominal Size | 10 Inch (DN250) |
| Valutazione della pressione | ASME Class 300 (300LB) |
| Body Material | ASTM A216 WCB (Standard) |
| Optional Materials | ASTM A351 CF8, CF8M, WC6, WC9, LCB, Duplex, Super Duplex |
| Bellows Material | SS316L Multi-layer Stainless Steel |
| Stem Material | ASTM A182 F6a / F316 |
| Disc Material | WCB + 13Cr or Stellite Hard Facing |
| Seat Material | Integral Seat / Stellite Overlay |
| Imballaggio | Flexible Graphite Secondary Seal |
| Termina connessione | RF Flanged End |
| Flange Standard | ASME B16.5 Class 300 |
| Norma di progettazione | BS 1873 |
| Face-to-Face | ASME B16.10 |
| Pressure Design | ASME B16.34 |
| Inspection & Testing | API598 |
| Operazione | Handwheel (Gear, Pneumatic & Electric Optional) |
What Is a Bellows Sealed Globe Valve?
A bellows sealed globe valve is a linear motion valve designed for both flow regulation E tight shut-off.
Unlike conventional valves, it incorporates a welded stainless steel bellows assembly that seals the valve stem from the atmosphere.
Working Principle
- Turning the handwheel moves the valve stem.
- The welded bellows expands and contracts with the stem movement.
- Process media remain completely contained within the valve body.
- Flexible graphite packing provides a secondary safety seal.
- The valve delivers accurate flow control with virtually no external leakage.
This dual sealing system significantly improves operational safety and environmental protection.
Main Features
Zero Fugitive Emissions
The stainless steel bellows eliminates stem leakage, helping plants comply with environmental regulations and reducing product loss.
Excellent Flow Regulation
The globe valve design provides:
- Precise throttling
- Stable pressure control
- Smooth operation
- Excellent shut-off performance
- Minimal vibration
Heavy-Duty Flanged Construction
The RF flanged connection offers:
- Easy installation
- Reliable gasket sealing
- Convenient maintenance
- Compatibility with ASME Class 300 piping systems
Long Bellows Service Life
The precision-formed multi-layer stainless steel bellows is designed for thousands of operating cycles while maintaining leak-tight performance.
Secondary Packing Safety
Graphite packing acts as a backup seal, providing additional protection even if the bellows reaches the end of its fatigue life.
Advantages Over Conventional Globe Valves
| Feature | Bellows Sealed Globe Valve | Standard Globe Valve |
| Stem Leakage | Near Zero | Possible |
| Fugitive Emissions | Very Low | Higher |
| Maintenance | Low | Regular Packing Adjustment |
| Environmental Protection | Excellent | Standard |
| Service Life | Longer | Standard |
| Operating Safety | Higher | Normal |
Although the initial investment is higher, bellows sealed valves provide lower maintenance costs and greater long-term reliability.
Typical Applications
Steam Systems
Suitable for:
- Main steam pipelines
- Boiler systems
- Condensate recovery
- Steam distribution networks
Petrochemical Plants
Used in:
- Refining processes
- Hydrocarbon service
- Solvent transfer
- Process utilities
Chemical Processing
Ideal for:
- Hazardous chemicals
- Toxic media
- Organic solvents
- Corrosive process fluids
Sistemi ad olio termico
Provides dependable sealing under elevated operating temperatures.
LNG & Industrial Gas
Suitable for:
- Natural gas
- Nitrogen
- Hydrogen
- Process gases
Power Generation
Commonly installed in:
- Feedwater systems
- Turbine auxiliaries
- Cooling water systems
- Boiler piping
Optional Configurations
STV Valves offers customized options including:
- Electric Actuator
- Pneumatic Actuator
- Gear Operator
- Position Indicator
- Locking Device
- Stellite Trim
- Progettazione antincendio
- Low Fugitive Emission Packing
- Cryogenic Bonnet Extension
- NACE MR0175 Compliance
- EN 10204 3.1 / 3.2 Material Certificates
- Third-Party Inspection (SGS, BV, DNV, TÜV)
Inspection and Quality Assurance
Every Bellows Sealed Globe Valve undergoes strict inspection before shipment.
Quality procedures include:
- Hydrostatic Shell Test
- Seat Leakage Test
- Bellows Integrity Test
- Air Leakage Test
- Backseat Test
- Positive Material Identification (PMI)
- Dimensional Inspection
- Functional Operation Test
- Final Visual Inspection
Testing is performed according to API598, ASME B16.34, and customer specifications.
Why Choose STV Valves?
STV Valves is a trusted global manufacturer of industrial valves for oil & gas, petrochemical, chemical processing, power generation, marine, mining, and water treatment industries.
Our Product Range
- Bellows Sealed Globe Valves
- Valvole a globo
- Gate Valves
- Valvole a sfera
- Controlla le valvole
- Butterfly Valves
- Valvole a saracinesca a coltello
- Y Strainers
- Basket Strainers
Available Materials
- ASTM A216 WCB
- ASTM A351 CF8 / CF8M
- ASTM A352LCB
- ASTM A217 WC6 / WC9
- Duplex Stainless Steel
- Super Duplex Stainless Steel
- Titanio
- Hastelloy C276
- Monel 400
- Inconel 625
With advanced manufacturing facilities, CNC machining centers, and rigorous quality control, STV Valves delivers reliable valve solutions that comply with API, ASME, DIN, EN, and ISO standards.
Visit www.stvvalves.com to request technical documentation, pricing, or customized engineering support.
Frequently Asked Questions (FAQ)
What is the advantage of a bellows sealed globe valve?
A bellows sealed globe valve prevents stem leakage by using a welded metal bellows, improving safety, reducing fugitive emissions, and lowering maintenance costs.
Why choose a 10-inch Class 300 globe valvola?
A 10-inch Class 300 valve is ideal for medium- to high-pressure industrial pipelines handling steam, oil, gas, chemicals, and process fluids where precise flow control is required.
Can this valve be automated?
Yes. It can be supplied with electric, pneumatic, or gear actuators to meet automated process control requirements.
Which materials are available?
In addition to WCB carbon steel, STV Valves offers stainless steel, alloy steel, duplex, super duplex, titanium, Hastelloy, Monel, and Inconel materials.
Which standards does this valve comply with?
The valve is manufactured according to BS 1873, ASME B16.34, ASME B16.5, ASME B16.10, E API598.
