1/2"-300LB BW Ends Cryogenic Bellows Seal Gate Valve
1/2"-300LB BW Ends Cryogenic Bellows Seal Gate Valve - Image 2
1/2"-300LB BW Ends Cryogenic Bellows Seal Gate Valve - Image 3
1/2"-300LB BW Ends Cryogenic Bellows Seal Gate Valve - Image 4

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

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Description

Technical Data Sheet: 1/2″-300LB BW Ends Cryogenic Bellows Seal Gate Valve (F316L)

Item Specification
Product Name Cryogenic Bellows Seal Gate Valve / Low Temperature Bellows Gate Valve
Valve Type Gate Valve (Bolted Bonnet, Rising Stem, Bellows Seal)
Nominal Size 1/2 Inch (DN15)
Pressure Rating Class 300 LB (PN50)
End Connection Butt-Weld Ends (BW) per ASME B16.25
Body Material ASTM A182 F316L (Austenitic Stainless Steel)
Design Standard API 602 / ASME B16.34 / BS 5352

General Description

The 1/2″-300LB Cryogenic Bellows Seal Gate Valve is specifically designed for service in low-temperature applications requiring zero leakage, such as handling liquefied gases (LNG, LN₂, LOX, LAr). Constructed entirely from ASTM A182 F316L stainless steel, this valve ensures excellent toughness and ductility at cryogenic temperatures down to -196°C . It features an extended bonnet (long neck) design combined with a metal bellows seal to protect the packing and stem seals from extreme cold while providing absolute containment of the medium. The butt-weld ends provide a permanent, leak-free connection suitable for critical cryogenic service .

Technical Parameters

Parameter Value / Range Remarks
Pressure Rating Class 300 LB (PN50 / 5.0 MPa) Working pressure per ASME B16.34
Nominal Size 1/2 Inch (DN15)
Design Temperature -196°C to +80°C Suitable for cryogenic media down to -196°C (LNG, LN₂)
Applicable Media LNG, LN₂, LO₂, LAr, LC₂H₄ Liquefied natural gas, nitrogen, oxygen, argon, ethylene
Connection Type Butt-Weld Ends (BW) Per ASME B16.25 / ASME B36.19M
Sealing Mechanism Bellows Seal + Packing Double sealing system for zero leakage
Operation Handwheel Manual rising stem
Special Feature Extended Bonnet + Bellows Seal Protects packing from freezing; ensures zero fugitive emissions

Materials of Construction

All pressure-containing parts are manufactured from ASTM A182 F316L austenitic stainless steel, specifically selected for its superior low-temperature toughness and corrosion resistance.

Component Material (ASTM) Remarks
Body ASTM A182 F316L Austenitic Stainless Steel (0.03% max Carbon)
Bonnet / Valve Cover ASTM A182 F316L Extended bonnet design for cryogenic service
Gate / Wedge ASTM A182 F316L Solid wedge, fully guided
Stem ASTM A182 F316L Rising stem, roll-threaded for strength
Bellows Assembly ASTM A182 F316L Metal bellows for zero leakage sealing
Seat Ring Integral with Body / Deposit welded Stellite hardfacing optional for extended life
Body-Bonnet Gasket Spiral Wound, 304SS + Flexible Graphite Ensures leak-tight seal at low temperatures
Bolting (Studs) ASTM A193 Grade B8 (Class 2) Stainless steel, strain-hardened
Bolting (Nuts) ASTM A194 Grade 8 Stainless steel
Packing Flexible Graphite Secondary seal, low fugitive emissions
Packing Gland ASTM A182 F316L
Yoke / Support ASTM A182 F316L
Stem Nut Copper Alloy / Bronze
Handwheel Carbon Steel / Malleable Iron ASTM A197 / A47

Dimensional Data

*Note: Dimensions are typical for 1/2″ Class 300 BW bellows seal gate valve with F316L body. For exact installation dimensions, refer to manufacturer’s certified drawing.*

Dimension Value (mm) Value (inches) Remarks / Standard
Face-to-Face Length (L) 140 mm 5.51″ For BW ends, Class 300, 1/2″ (per API 602 / manufacturer data)
Overall Height (H) – Closed ~ 200-210 mm ~ 8.0″ From centerline of valve to top of handwheel (approx.)
Extended Bonnet Height (B) 150-180 mm (typical) 6.0-7.0″ From body centerline to bottom of packing flange
Handwheel Diameter (W) 120-140 mm 4.7-5.5″
Weld End OD (A) 21.3 mm 0.84″ Per ASME B16.25 (Schedule 40S typical)
Weld End Wall Thickness (t) 3.73 mm 0.147″ Per ASME B36.19M (Schedule 40S)
Approx. Weight ~ 9-10 kg ~ 20-22 lbs Slightly heavier than standard due to bellows assembly

Applicable Standards

  • Design & Manufacture: API 602, ASME B16.34, BS 5352

  • Bellows Design: ISO 15848 (Fugitive Emission Standards)

  • Face-to-Face Dimensions: ASME B16.10 (for BW ends, refer to manufacturer)

  • Butt-Weld Ends: ASME B16.25 / ASME B36.19M

  • Pressure-Temperature Rating: ASME B16.34 (F316L Group 2)

  • Inspection & Testing: API 598, ISO 5208

  • Cryogenic Testing: ISO 28921 (Low temperature valve testing)

  • Material Certification: EN 10204 Type 3.1 (Mill Certificates with traceability)

  • Low-Temperature Impact Testing: Per ASME B16.34 / ASTM A370 (Charpy V-Notch at -196°C)

Key Features & Applications

Key Features:

  • F316L Austenitic Stainless Steel: Provides exceptional toughness, ductility, and corrosion resistance at cryogenic temperatures as low as -196°C .

  • Bellows Seal Design: Metal bellows assembly provides zero-leakage stem sealing, eliminating fugitive emissions and preventing介质 loss .

  • Extended Bonnet with Bellows + Packing Double Seal: The long neck raises the stuffing box away from the cold line, ensuring the packing remains above freezing. The bellows provides primary seal, with packing as secondary backup .

  • Zero Leakage Performance: Bellows seal eliminates the need for gland packing adjustments and ensures compliance with ISO 15848 fugitive emission standards .

  • Low-Temperature Toughness: All F316L components are impact-tested at -196°C to guarantee resistance to brittle fracture .

  • Leak-Free Construction: Butt-weld ends eliminate flange leakage paths, critical for cryogenic service.

  • Long Service Life: Bellows design eliminates stem seal wear, significantly extending valve life in cyclic service .

  • Full Traceability: Material test reports (MTRs) available per EN 10204 3.1.

Main Applications:

  • LNG (Liquefied Natural Gas) Plants and Terminals

  • Air Separation Units (LOX, LIN, LAr)

  • Ethylene and Petrochemical Cryogenic Processes

  • Storage and Transportation of Cryogenic Liquids

  • Hydrogen Liquefaction (LH₂) Facilities (subject to material compatibility review)

  • Critical Service Applications Requiring Zero Fugitive Emissions

Ordering Information

When ordering, please specify:

  1. Product: 1/2″ Cryogenic Bellows Seal Gate Valve

  2. Pressure Rating: Class 300 LB

  3. End Connection: Butt-Weld (BW) per ASME B16.25

  4. Body Material: ASTM A182 F316L (for -196°C service)

  5. Bellows Material: ASTM A182 F316L

  6. Test Requirements: API 598, with Impact Test at -196°C per ASME B16.34

  7. Fugitive Emission Test: ISO 15848 (optional)

  8. Media: LNG / LN₂ / LO₂ / etc.

  9. Certification: EN 10204 Type 3.1 Material Certificates required

Notes:

  • This datasheet is based on API 602, ASME B16.34, and common industry practice for cryogenic bellows seal valves .

  • F316L material provides optimum performance for services below -101°C due to its low carbon content and fully austenitic structure.

  • For oxygen service (LOX), special cleaning and degreasing procedures are required (refer to ASTM G93).

  • Bellows seal valves are recommended for critical applications requiring zero fugitive emissions and maximum reliability .

  • Always consult the manufacturer’s certified dimensional drawing for installation and ensure weld end schedule matches mating pipe.

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