Cryogenic Valves, Fittings & Piping Suppliers & Manufacturers
Cryogenic valves, fittings, and piping are the flow control and containment components of every liquefied gas system. Together they connect storage vessels, pumps, vaporizers, and end-use equipment while maintaining low-temperature integrity from -50 °C down to -269 °C. Component selection depends on the cryogen, service pressure, cleanliness requirements, and whether the installation is stationary or mobile.
Valves in this category include ball, globe, gate, check, control, and safety relief designs with extended bonnets and low-temperature-compatible seats and packing. Fittings include cryogenic-rated flanges, welded transitions, bayonet connectors, dry-break couplings, and flexible metal hoses. Piping includes standard low-temperature stainless steel pipe under ASME B31.3 or EN 13480, vacuum jacketed rigid pipe, and vacuum jacketed flexible hose. Applications span LNG bunkering, hydrogen fueling, air separation cold boxes, industrial gas distribution, and research infrastructure.
This directory lists cryogenic valve, fitting, and piping suppliers worldwide as a combined listing. Each supplier profile covers component types manufactured or distributed, pressure and temperature ratings, materials of construction, certifications including BS 6364, MSS SP-134, EN 1626 for valves, ASTM A312 for piping materials, cleaning standards for LOX and hydrogen service, and geographic coverage.
Buyers comparing suppliers typically weigh cryogenic type test documentation, fire-safe certification where applicable, oxygen cleanliness per ASTM G93 or CGA G-4.1, hydrogen-compatibility documentation and embrittlement mitigation, delivery lead times which range from stock items to 26 weeks for engineered valves, and after-sales technical support. Filter by country, component category, or cryogen served.
Frequently asked questions
What defines a cryogenic-rated valve?
A cryogenic valve is designed and tested for service below -50 °C. Key features are an extended bonnet to keep stem packing above the frost line, low-temperature-compatible body materials (austenitic stainless steel, bronze), and seat materials rated for cryogenic sealing such as PCTFE or PEEK. Testing to BS 6364 or EN 1626 verifies performance.
What is a bayonet connector?
A bayonet is a specialized cryogenic pipe joint that allows connection and disconnection without breaking vacuum in adjacent sections. It uses a male-female geometry with low thermal conductivity and controlled vacuum penetration. Bayonets are common in laboratory helium supply, quantum computing infrastructure, and reconfigurable research systems.
Which piping code applies to cryogenic systems?
In the US, ASME B31.3 for process piping including cryogenic. In Europe, EN 13480. For LNG specifically, EN 1473 for onshore facilities and NFPA 59A. Material selection is critical — only austenitic stainless steel, aluminum alloys, or 9% nickel steel avoid brittle fracture at cryogenic temperature.
Do valves and fittings for oxygen service require special cleaning?
Yes. Components in liquid oxygen or gaseous oxygen service must be cleaned to CGA G-4.1, ASTM G93 Level C or better, or EIGA Doc 33. Hydrocarbons and particulate must be removed to specified limits, and components are shipped with cleaned-and-capped end protection until installation.
How are cryogenic valves and piping tested before shipment?
Valves undergo shell hydrostatic tests, seat leakage tests at both ambient and cryogenic temperature (typically LN2 immersion at -196 °C) per BS 6364. Piping systems receive hydrostatic tests at 1.5× design pressure per the applicable code, plus positive material identification (PMI) for cryogenic-critical materials.