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. 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.

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.