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

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

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

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.

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.*

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. Druckbewertung: Class 300 LB
3. Endverbindung: Stumpfschweißen (BW) gemäß ASME B16.25
4. Gehäusematerial: 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. Zertifizierung: 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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