The Bellow Seal Gate Valve is a specialized type of gate valve designed to provide zero leakage in critical applications involving hazardous, toxic, or high-temperature fluids. It incorporates a metallic bellows seal that acts as a secondary barrier, ensuring complete isolation of the fluid from the environment and enhancing safety in demanding industrial processes.
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Key Specifications:
- Main specifications:
- Size: 2 to 14 inches DN 50 to 350
- Pressure: 150 to 600lbs
- Design and manufacture: ANSI B16.34
- Face to face: ANSI B16.10
- Flanged ends: ANSI B16.5
- BW ends: ANSI B16.25
- Test and inspection: API 598, API 6D
- Main parts materials:
- Body-bonnet: cast steel A216WCB, alloy steel A217 WC6, WC9, stainless steel
- Sealing face: A182 F6, A182 F304, F316, monel
- Stem: A182 F6, A182 F304, F316, monel
- Full range of trim materials to match any services
Key Features:
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Bellow Seal Design:
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Metallic Bellows: A stainless steel or alloy bellows forms a hermetic seal around the valve stem, eliminating leakage paths and preventing fugitive emissions.
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Double Sealing: Combines the primary seat seal with the bellows seal for redundant leak protection.
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Material:
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Body Material: Typically constructed from cast steel (WCB, WCC), stainless steel (CF8, CF8M), or exotic alloys for corrosion resistance.
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Seat and Disc: Hardened stainless steel or surface-coated materials to ensure durability and tight sealing.
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Operation:
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Manual operation (handwheel or gear operator) or automated actuation (electric, pneumatic).
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Smooth stem movement enabled by the bellows, reducing friction and wear.
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Applications:
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Ideal for handling hazardous chemicals, high-pressure steam, cryogenic fluids, and volatile hydrocarbons.
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Standards:
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Compliant with API 602 (compact gate valves), ASME B16.34 (pressure-temperature ratings), and ISO 15848 (emission standards).
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