3/4″-800LB-SW Bellows Seal Gate Valve

Technical Data Sheet

Product: Bellows Seal Gate Valve
Model / Size: 3/4″ – 800LB – SW

1. Product Description

This valve adopts a bellows seal design, which fundamentally eliminates stem packing leakage commonly found in conventional gate valves. The bellows assembly, combined with the stem, forms a static seal. An additional packing box serves as a secondary backup seal, achieving a “zero leakage” stem sealing performance. It is suitable for severe service conditions including high temperature, high pressure, high vacuum, and toxic, flammable, or corrosive media.

2. Basic Parameters

3. 設計基準

4. Bill of Materials (Typical Configuration)

5. Dimensions & Weight (Reference)

6. Operating Conditions

7. Testing & Inspection

• Shell Strength Test: 1.5 times rated pressure, no leakage.
• High-Pressure Seat Test: 1.1 times rated pressure.
• Low-Pressure Pneumatic Test: 0.6 MPa compressed air.
• Bellows Leak Test: Helium mass spectrometry, leakage rate < 1×10⁻⁶ Pa·m³/s (or meeting Class V sealing requirement).
• Operational Test: Valve cycled fully open/close under rated differential pressure.

8. Features & Benefits

1. Zero Leakage Assurance: The bellows isolates the stem from the atmosphere, eliminating external stem leakage – ideal for stringent environmental applications.
2. Long Service Life: High-cycle-life bellows design ensures reliability under frequent operation.
3. Low Maintenance: Dual stem sealing (bellows + packing) provides a secondary seal in the event of bellows failure, ensuring system safety.
4. High Temperature & Pressure Capability: Class 800 rating with socket weld ends is suitable for high-pressure steam and thermal oil systems.

Notes:

1. Dimensions and weights are typical values based on API 602; actual values may vary slightly depending on manufacturer design (e.g., handwheel size, bonnet height).
2. For NACE MR0175 (sour service) compliance, please specify when ordering.
3. During installation, follow the approved Welding Procedure Specification (WPS) for socket weld connections to avoid welding stress that could affect bellows life.

保証:

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