3/4″-800LB-SW Bellows Seal Gate Valve

3/4″-800LB-SW Bellows Seal Gate Valve

Nominal Size 3/4 inch (DN 20)
Pressure Class Class 800LB (equivalent to PN 140 ~ 160 bar, depending on standard)
End Connection Socket Weld (SW)
Structure Type Outside Screw & Yoke (OS&Y) / Solid Wedge
Stem Sealing Bellows seal + auxiliary graphite packing

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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.

  1. Basic Parameters

Item

Paramètre

Taille nominale

3/4 inch (DN 20)

Pressure Class

Class 800LB (equivalent to PN 140 ~ 160 bar, depending on standard)

End Connection

Socket Weld (SW)

Structure Type

Outside Screw & Yoke (OS&Y) / Solid Wedge

Stem Sealing

Bellows seal + auxiliary graphite packing

  1. Normes de conception

Item

Standard

Design & Manufacture

API 602 (Steel Gate, Globe and Check Valves for Petroleum and Natural Gas Industries – Compact Design)

Pressure-Temperature Rating

ASME B16.34

End Connection (SW)

ASME B16.11

Face-to-Face Dimension

ASME B16.10 / Manufacturer’s standard

Inspection & Testing

API 598 (or ISO 5208)

Bellows Testing

ISO 15848-1 (Fugitive Emissions Standard)

  1. Bill of Materials (Typical Configuration)

Part Name

Material (Typical Options)

Remarques

Corps

A105 / A182 F316

Carbon steel / Stainless steel optional

Wedge

A105 + 13Cr / F316

13Cr or Stellite hardfacing on sealing faces

Seat Ring

Integral per API 602

Stellite 6 hardfacing on body seat

Tige

A182 F6a / F316

Precipitation hardened stainless / Austenitic SS

Bellows Assembly

SS304 / SS316L

Multi-ply formed, high cycle life

Bonnet

A105 / A182 F316

Matching body material

Packing

Flexible Graphite

With corrosion inhibitor

Handwheel / Stem Nut

Carbon steel (or ductile iron) / Copper alloy

  1. Dimensions & Weight (Reference)

Item

Value

Face-to-Face (L)

Approx. 117 mm (per API 602)

Handwheel Diameter (W)

Approx. 100 mm

Overall Height (H)

Approx. 240 mm

Socket Weld Bore (D)

Per ASME B16.11, socket depth approx. 10 mm

Approx. Weight

5.5 ~ 7.5 kg (depending on material)

  1. Operating Conditions

Item

Paramètre

Suitable Media

Steam, thermal oil, toxic gases/liquids, corrosive media, hydrocarbons

Temperature Range (Carbon Steel)

-29°C ~ 425°C

Temperature Range (Stainless Steel)

-196°C ~ 538°C (cryogenic / high temperature)

Max. Allowable Pressure

Per ASME B16.34, Class 800LB at ambient temperature (38°C) approx. 13.8 MPa (138 bar)

  1. 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.
  1. 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.

GARANTIE :

SAVVY VALVES s'engage à fournir des produits d'une qualité exceptionnelle et un service après-vente sans souci. Nos vannes sont garanties pour une durée de vie minimale de 12 mois, période durant laquelle nous fournissons gratuitement toutes les pièces de rechange nécessaires et des instructions d'entretien détaillées. Pendant la période de garantie, en cas de dommage non causé par l'homme, nous remplaçons gratuitement les composants et fournissons une assistance technique professionnelle. Après l'expiration de la garantie, seuls les pièces de rechange sont à votre charge, tout en bénéficiant de services de maintenance à prix réduits. Notre objectif est d'aider nos clients à réduire leurs coûts d'exploitation et à optimiser leur production grâce à une qualité fiable et un service après-vente complet. Qu'il s'agisse de questions techniques ou de besoins de maintenance, notre équipe d'experts répondra rapidement pour garantir le fonctionnement optimal de votre système de vannes.

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