1-1/2″ – 300LB Cryogenic Bellows Seal Gate Valve

Technical Datasheet: Cryogenic Bellows Seal Gate Valve

Product Name: Cryogenic Bellows Seal Gate Valve
Connection: Flanged Ends (ASME B16.5)
Nominal Size: 1.5 inches (DN40)
Pressure Rating: Class 300 LB
Body Material: Stainless Steel (CF8 / CF8M / CF3M)

1. General Design Features

• Type: Bellows-sealed gate valve, specifically designed for cryogenic services.
• Service Temperature: Designed for cryogenic applications down to -196°C (-320°F) (LNG, Liquid Nitrogen, Liquid Oxygen) .
• Seal Design: Zero-leakage to atmosphere via a primary welded metal bellows. A secondary graphite packing provides backup sealing.
• Bonnet Design: Extended bonnet construction to ensure the stem packing and bellows assembly remain above 0°C, preventing ice formation and seal failure .
• Cryogenic Treatment: All pressure-containing parts are subjected to deep cryogenic treatmentat -196°C to ensure dimensional stability and prevent austenite transformation .
• Back Seat: Integral back seat allows for repacking under pressure (if bellows fails) and protects the packing from direct media flow.
• Operation: Rising stem with non-rising handwheel for visual position indication.

2. Applicable Standards & Specifications

3. Operating Parameters

4. Bill of Materials (Stainless Steel Cryogenic Design)

Note: Materials are selected to meet BS 6364 cryogenic requirements .

5. Dimensional Data (1.5″ – Class 300 LB)

Note: The extended bonnet length (H) is critical for cryogenic service to maintain the packing box temperature above 0°C.

6. Special Requirements for Cryogenic Service (Per BS 6364)

6.1 Deep Cryogenic Treatment

All stainless steel pressure parts shall be thermally cycled to -196°C to stabilize the austenitic structure and prevent dimensional changes during operation .

6.2 Extended Bonnet (Cold Box Design)

The bonnet length must be sufficient to ensure the temperature at the stuffing box is maintained above 0°C to prevent ice formation on the stem and bellows .

6.3 Stellite Hardfacing

Seat and wedge surfaces must be overlaid with Stellite (Cobalt-Chromium alloy) to prevent galling and seizure at cryogenic temperatures .

6.4 Cleanliness & Degreasing

Valves for oxygen service (LO₂) require oxygen cleaning to remove all hydrocarbons and prevent combustion risks.

7. Inspection & Testing Procedure (Per BS 6364)

8. Features & Benefits

• Zero Fugitive Emissions: Welded metal bellows eliminates stem leakage, critical for volatile cryogenic fluids.
• BS 6364 Certified: Full compliance with international cryogenic valve standard .
• No Icing: Extended bonnet prevents ice formation on stem seals .
• Long Cycle Life: Bellows design handles thermal cycling without failure.
• Stellite Protection: Prevents galling of stainless steel at cryogenic temperatures .

GUATANTEE:

SAVVY VALVES is committed to delivering exceptional product quality and worry-free after-sales service. Our valves are guaranteed to provide a minimum service life of 12 months, during which we will supply all necessary spare parts and detailed maintenance instructions free of charge. Within the warranty period, if any non-human-induced damage occurs, we will replace components at no cost and provide professional technical support. After the warranty expires, customers only need to pay for the cost of spare parts, while still benefiting from discounted maintenance services. Our goal is to help clients reduce operational costs and enhance production efficiency through reliable quality and comprehensive after-sales support. Whether for technical inquiries or maintenance needs, our expert team will respond promptly to ensure your valve system maintains optimal performance at all times.