An Extended Stem Bellows Seal Valve is a type of valve equipped with a bellows seal for enhanced leak-proof performance and an extended stem for temperature-sensitive applications.
Ext. Stem Bellow Seal Globe / Gate Valve
A Ext. Stem Bellow Seal Globe / Gate Valve is a construction that is a kind Valve that seals the valve stem components using bellow.
A Bellow is contained within the Globe / Gate valve, and the lower end of the stainless-steel / nickel alloy Bellow is welded to the stem to prevent the stem from being eroded by system fluid.
The other end is inserted between the valve's body and cover to form a permanent seal. This double seal structure prevents leakage; in the event that the bellow collapse, the stem packaging will prevent further leakage. The bellow are welded to the valve stem to provide steady operation and to eliminate valve stem vibration caused by the valve insert movement.
Specifications | Features |
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Type : Globe / Gate End Connection: Flange (B16.5) / Butt Weld (B16.25) Size: 15 NB - 600 NB Class: #150 - #900 Temperature Range: -190° C to 350 ° C MOC: Carbon Steel / Stainless Steel / Alloy Design Standard: MSS SP-117 / API 623 / API 600 / API 602 Cycle Life: 3000 - 5000 - 10000 Cycle Face to Face: ASME B16.10 Rev 2009 Operation: Manual & Actuated (Diaphragm / Electric / Gear / Cylindrical) Fire safe design: API 6FA Testing: API 598 Rev 2009 / ISO 15848 Documents: BS/EN 10204-3.1 REV 2019 |
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FAQ’s
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- What is an Extended Stem Bellows Seal Gate/ Globe Valve?
- How does it work?
It operates by using a flexible metallic bellows to seal the valve stem, which is extended to accommodate insulation or remote operation. The bellows expand or contract to open or close the valve while maintaining a hermetic seal, preventing leaks.
- What are the main applications?
These valves are mainly used in industries such as chemical processing, oil and gas, pharmaceuticals, power generation, and cryogenics. They are ideal for applications involving insulated systems, hazardous media, high temperatures, or cryogenic environments.
- What are the benefits of using one?
Benefits include superior leak prevention, the ability to handle hazardous and high-temperature media, suitability for insulated systems, reduced maintenance needs, and increased service life.
- What materials are used in their construction?
Consider the type of media, operating temperature and pressure, required flow rate, industry standards, and the need for insulation or remote operation. Select appropriate materials and design features to ensure compatibility with your specific application.
- How do I choose the right one for my application?
Yes, but repairs should be performed by qualified professionals or the manufacturer to ensure the valve's integrity and performance.
- Can they be repaired?
Minimal maintenance is required due to their robust design. Regular inspections and adherence to the manufacturer’s maintenance guidelines are recommended to ensure optimal performance.
- Are they available in different designs?
Yes, they are available in various designs to meet different application requirements, including straight, angle, and Y-pattern designs, with options for manual, pneumatic, or electric actuation.
- What standards govern the manufacturing of Extended Stem Bellow Seal Globe Valves?
Manufacturing is governed by standards such as API, ASME, ANSI, DIN, and ISO, ensuring the valves meet stringent safety, quality, and performance criteria.
Industries where Extended Bellow Seal Globe / Gate Valve is Used
Chemical Processing
Oil and Gas Industry
Pharmaceutical Industry
Power Generation
Natural Gas Industry
Applications of Extended Stem Bellow Seal Globe / Gate Valves:
- Insulated Systems: Used in processes requiring valve operation through insulation layers.
- Chemical Processing: Ideal for handling corrosive and hazardous chemicals safely.
- Cryogenic Services: Maintains tight seals in extremely low-temperature environments.
- Oil and Gas: Prevents leaks in pipelines and refineries, especially in remote locations.
- Power Generation: Manages high-temperature steam and fluids in power plants.
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