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)
Jmenovitá velikost: 1.5 inches (DN40)
Jmenovitý tlak: Class 300 LB
Materiál těla: Stainless Steel (CF8 / CF8M / CF3M)
- General Design Features
- Typ: 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.
- Operace: Rising stem with non-rising handwheel for visual position indication.
- Applicable Standards & Specifications
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Item
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Standard / Specification
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Design & Manufacturing
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BS 6364 (Specification for valves for cryogenic service) , API 600, ASME B16.34, GB/T 44916
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Face-to-Face Dimensions
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ASME B16.10
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Flange Connection
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ASME B16.5 (Class 300 LB)
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Pressure-Temperature Rating
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ASME B16.34
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Testing & Inspection
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BS 6364, API 598, ISO 5208, GB/T 24925
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Bellows Standard
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ISO 15761 / BS EN 137-1
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Fugitive Emissions
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ISO 15848-1 (Optional)
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- Operating Parameters
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Item
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Specifikace
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Velikost
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1.5 inches (DN40)
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Jmenovitý tlak
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Class 300 LB (Max 51 bar @ ambient per ASME B16.34)
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Shell Test Pressure
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77 bar (Hydrostatic, 1.5 x Class 300 rating)
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Seat Test Pressure
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56 bar (Hydrostatic, 1.1 x Class 300 rating)
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Design Temperature
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-196°C to +80°C (Cryogenic service)
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Suitable Media
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LNG, LPG, Liquid Nitrogen (LN₂), Liquid Oxygen (LO₂), Liquid Argon, Ethylene
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Leakage Rate
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Zero leakage to atmosphere (bellows seal)
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- Bill of Materials (Stainless Steel Cryogenic Design)
Note: Materials are selected to meet BS 6364 cryogenic requirements .
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Item
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Part Name
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Material Specification
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1
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Tělo
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ASTM A351 CF8M (316 Stainless Steel Casting)
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2
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Bonnet (Extended)
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ASTM A351 CF8M (316 Stainless Steel Casting)
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3
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Gate / Wedge
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ASTM A182 F316L with Stellite hardfacing (Co-Cr alloy)
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4
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Seat Ring
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Stellite hardfaced (integral with body)
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5
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Bellows
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ASTM A240 316L (Multi-ply Stainless Steel)
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6
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Zastavit
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ASTM A182 F316L (Austenitic Stainless Steel)
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7
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Body Gasket
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Spiral Wound 316SS + Graphite
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8
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Packing
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Graphite Ribbon Rings (Backup seal)
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9
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Bonnet Bolting
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ASTM A193 B8 / A194 8 (Stainless Steel)
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10
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Handwheel
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Ductile Iron / Fabricated Steel
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- 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.
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Dimension
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Value (mm / inches)
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Standard / Reference
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Face-to-Face Length (L)
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368 mm (14.50 inches)
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ASME B16.10
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Extended Bonnet Height (H)
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Approx. 580 – 620 mm
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Required to keep stem seal above freezing point (BS 6364 requirement)
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Flange Diameter (D)
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190 mm (7.48 inches)
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ASME B16.5 (Class 300)
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Bolt Circle Diameter (K)
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152.4 mm (6.00 inches)
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ASME B16.5 (Class 300)
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Number of Bolt Holes
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8
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ASME B16.5 (Class 300)
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Bolt Hole Diameter
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22 mm (0.88 inches)
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For 3/4″ bolts
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Weight
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Approx. 30 – 40 kg
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Dependent on bonnet extension length
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- 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.
- Inspection & Testing Procedure (Per BS 6364)
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Test Type
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Procedure
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Acceptance Criteria
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Shell Test
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Hydrostatic test at 1.5 x rated pressure (77 bar) .
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No visible leakage through pressure boundary
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Seat Test (Ambient)
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Hydrostatic test at 1.1 x rated pressure (56 bar) .
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No visible leakage across seat
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Cryogenic Test
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Test at -196°C per BS 6364 Clause 8
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Valve must operate without seizure; leakage rate ≤ 100 mm³/s (per nominal size)
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Bellows Integrity
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Helium leak test
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Leak rate ≤ 1×10⁻⁶ mbar·L/s
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Operational Torque
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Measure at ambient and cryogenic temp
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Torque must be within design limits
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- 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 .
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