Low Temperature Liquid Nitrogen Gate Valve Factory Direct – -196 Degree Celsius Cryogenic Service
Standard valves fail at these temperatures due to material embrittlement and packing failure, making specialized cryogenic construction essential. This article provides essential information on factory direct manufacturers and key selection parameters for -196 degree Celsius cryogenic gate valves.The main gate valve product names of China gate valve Network include:Electric Rising Stem Double Disc Parallel Gate Valve,Electric Non-rising Stem Single Disc Wedge Gate Valve,Electric Rising Stem Single Disc Wedge Gate Valve,Electric Wafer Knife-shaped Gate Valve,Electro-hydraulic Wafer Knife-shaped Gate Valve,Electric Slurry Valve,Electric Flange Gate Valve.
Why Cryogenic Gate Valves for Liquid Nitrogen Service
Liquid nitrogen service at -196 degree Celsius presents unique engineering challenges. Standard carbon steel becomes dangerously brittle, and conventional packing materials lose sealing capability. Cryogenic gate valves address these challenges through extended bonnet (long neck) design that keeps the packing box at ambient temperature, preventing ice formation and maintaining reliable stem sealing . Materials undergo deep cryogenic treatment before machining to eliminate residual stresses and prevent deformation at ultra-low temperatures . The valve cavity features a pressure relief vent on the gate inlet side to prevent abnormal cavity pressure buildup during thermal cycling .
Factory Direct Manufacturers
Fangzheng Valve Group (方正阀门集团) offers Z40H/Zp43/44/48H cryogenic gate valves with temperature range from -196°C to 300°C and pressure ratings Class 150 to 2500. Their valves feature hardfaced sealing surfaces for erosion resistance and comply with BS 6364 cryogenic standards . Chaoda Group (超达集团) manufactures DZ40H/DZ40Y cryogenic gate valves with extended bonnet design for liquid nitrogen, LNG, and liquid oxygen service. Their products meet BS 6364, API 602, and GB/T 24925 standards with sizes from DN50 to DN900 . Yancheng Fangding Cryogenic Valve (盐城方鼎低温阀门) is a specialized manufacturer with 12 years of experience, holding Chinese special equipment manufacturing license (TS2732887-2019) and CCS classification society certification. They produce DJ61F-40P cryogenic valves for liquid nitrogen, oxygen, argon, and LNG service . Powell Valves operates four cryogenic cleaning facilities certified by major industrial gas end users, offering valves from ½" to 60" for service temperatures as low as -423°F, with full material traceability and MTR portal access .
Technical Specifications
Cryogenic gate valves for -196°C service are available in sizes from DN15 to DN900 (NPS ½" to 36"), with pressure ratings PN16 to PN420 (Class 150 to 2500) . Body materials include LCB, LC3, CF8, CF8M, and other low-temperature-rated alloys . Design features include extended bonnet, anti-blowout stem, cavity pressure relief, and ISO 15848 Class A fugitive emission compliance . Standards include BS 6364 for cryogenic service, API 598 for testing, and ASME B16.34 for pressure-temperature ratings .
Selection Considerations
When specifying a cryogenic gate valve for liquid nitrogen service, verify the extended bonnet length meets your insulation and installation requirements. Confirm all pressure-containing materials are certified for -196°C service with Charpy impact test results. Ensure the valve includes cavity pressure relief to prevent overpressure during thermal cycling. Request full material traceability (EN 10204 3.1) and cryogenic test certification per BS 6364 .
Summary
Low temperature liquid nitrogen gate valves are essential for reliable isolation in cryogenic service down to -196 degree Celsius. Factory direct manufacturers such as Fangzheng Valve, Chaoda Group, Yancheng Fangding, and Powell offer certified cryogenic gate valves with extended bonnet design and deep cryogenic treatment. Selection requires careful evaluation of temperature rating, extended bonnet length, and material certification based on specific cryogenic system requirements.
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