CRYOGENIC VALVES
Cryogenic Valves Engineered to Your Specification
Down to −196 °C for LNG and air separation.
Product Range
Each family is available as a made-to-order valve sized for your operating parameters — no standard catalogue SKUs, engineering-led specification. Compare the cryogenic gate valve specifications and the cryogenic valve size and pressure range.
Cryogenic Butterfly Valve — Triple-Offset with Maintenance Port
Triple-offset metal-seated cryogenic butterfly valve with a maintenance port, so the seat can be serviced without cutting the line. The extended bonnet keeps the stem packing above 0 °C in service down to −196 °C.
DN200–1600 ｜ Class 150–1500
Cryogenic Ball Valve — Floating & Trunnion-Mounted
Floating and trunnion-mounted cryogenic ball valve with a full bore, so pressure drop stays minimal. A drip pan and extended bonnet keep the packing above 0 °C, and excess cavity pressure relieves automatically.
DN15–1050 ｜ Class 150–2500
Cryogenic Gate Valve — Flexible Wedge with Stellite-Overlaid Seats
Flexible-wedge cryogenic gate valve with double-stellite seats that hold tight as the body contracts. A relief hole in the disc balances abnormal cavity pressure, and the extended bonnet keeps the packing above 0 °C.
DN15–800 ｜ Class 150–2500
Cryogenic Globe Valve — Conical Metal-to-Metal Seat
Conical metal-to-metal seat for repeatable shut-off and throttling duty. Short travel and low torque suit frequent cycling, and the extended bonnet keeps the packing above 0 °C.
DN15–800 ｜ Class 150–2500
Cryogenic Check Valve — Lift, Swing & Axial-Flow Patterns
Lift, swing and axial-flow patterns, so the body can match the piping layout. The seats are stellite-overlaid for erosion resistance, and the swing pattern has no external leakage path.
DN15–1000 ｜ Class 150–2500
Cryogenic extended-bonnet valve: the three things that decide the design
Extended bonnet, face-to-face and service range decide how a cryogenic valve is built. The full engineering notes sit in our guides.
- Extended bonnet
250 mm minimum stainless neck (BS 6364) - keeps the packing above -20 C so the gland seal stays elastic - Face-to-face & flanges
350 mm long pattern / 190 mm short pattern, DN100 PN16 (EN 558); EN 1092-2 flanges, OD 220 mm, 8 x Ø19 mm - Service range
Down to -162 C LNG (liquid nitrogen to -196 C) - frost and cold-box insulation shown on the body - Full engineering notes: why the extended bonnet is built this way →
Size Range
From DN15 to DN400+ — one production line.
Cryogenic valves are engineered to order in every size class: compact needle and ball valves for small-bore lines, volume batches of extended-bonnet gate valves, and large-bore butterfly and fully-welded ball valves supplied with lifting lugs for engineered projects.
Specification Range
Size range varies by valve family — see Size Range above for representative deliveries.
Service Temperature Bands
Cryogenic service is not one condition. What has to be confirmed before a valve is released changes with the temperature band, because the governing risk moves from brittle fracture at the warmer end to differential contraction and seat tightness at the colder end. The table lists what a buyer should settle at each band — it is a checklist for the enquiry, not a materials recommendation.
| Service band | Typical media | What to confirm before ordering |
|---|---|---|
| 0 °C to −46 °C | LPG, ammonia, propylene | Impact-tested body material at the minimum temperature; bonnet length matched to the insulation plan |
| −46 °C to −101 °C | Ethylene, ethane | Low-temperature impact data for body and trim; extended-bonnet length; packing temperature rating |
| −101 °C to −196 °C | LNG, liquid nitrogen, liquid oxygen, liquid argon | Austenitic body grade; cryogenic treatment record for pressure-retaining parts; liquid-nitrogen test report |
The bands follow conventional cryogenic practice. Which standard and which test regime govern a specific order are set by the project specification and confirmed against BS 6364 and ISO 28921 at quotation.
Frequently Asked
- Which valve types are supplied for cryogenic service?
- The five families shown in the Product Range above — butterfly, ball, gate, globe and check valves — each in the extended-bonnet arrangement. Bore and seat design follow the family; the cryogenic engineering sits in body material, bonnet length and test regime.
- What is the lowest service temperature?
- Down to −196 °C. Liquid-nitrogen functional testing at −196 °C is part of the manufacturing scope on this page; a warmer duty does not relax that scope, it simply does not require it.
- Why does a cryogenic valve need an extended bonnet?
- To keep the stem packing above 0 °C while the body sits at cryogenic temperature. The extended-bonnet design is what makes the packing live in a normal operating range instead of at the process temperature.
- Which design standards apply?
- The Specification Range above lists API 6D / 609 / 608 / 600 / 594 / 602, BS 6364, ISO 28921 and ASME B16.34. Which of these governs a given order is set by the project specification, and the applicable test regime is confirmed at quotation.
- What body material is used?
- Austenitic stainless steel to ASTM A351, in CF8M / CF3M / CF3 / CF8. The grade follows the medium and the minimum temperature; the recorded material is stated on the quotation rather than assumed from the valve type.
- What size and pressure range is available?
- Size 1/2"–64" (DN15–DN1600), pressure class 150–2500 (PN16–PN420). The reachable size varies by valve family, so the Size Range section above should be read per family rather than as one envelope.
- Are fire-safe and low-emission designs available?
- Fire-safe and low-emission (ISO 15848-1) designs are listed in the Manufacturing & Testing Capabilities section. Whether a given order carries them is confirmed on the quotation, since the requirement comes from the project specification.
- Can the cryogenic treatment and test records be supplied with the valves?
- Cryogenic treatment of pressure-retaining parts for dimensional stability, and liquid-nitrogen testing at −196 °C, both sit in the manufacturing scope shown above. The documentation package for a specific order is agreed when the order is quoted.
Applications
Manufacturing & Testing Capabilities
- Cryogenic treatment of pressure-retaining parts for dimensional stability
- Extended-bonnet design keeps stem packing above 0 °C during cryogenic service
- Liquid-nitrogen functional testing at −196 °C
- Fire-safe and low-emission (ISO 15848-1) certified designs
- Design life 30+ years (per manufacturer's datasheet)
Liquid-nitrogen functional testing at −196 °C — a valve submerged in the LN₂ bath, surface frosted and the cryogen boiling off during the test cycle.
Certifications
Our manufacturing partner holds API 6D / 6A / 602 / 609 monograms, type approvals from ABS, DNV, CCS, LR, BV, KR and RS classification societies, SIL product certificates, fire-safe and low-emission (ISO 15848-1) certifications, and operates a CNAS-accredited laboratory. Certificates available on request.
Factory Capability
Heavy-duty machining, assembly and in-house testing under one roof.
See how our valve plant is built — casting, machining, coating, assembly and testing in one place.
Track Record
Valves in service at LNG receiving terminals, petrochemical complexes and marine gas-fuel systems across China and overseas, including projects in the Middle East, Africa and Southeast Asia.
Company campus.
How to Order
Submit operating parameters
Engineering review & sizing
Quotation
Manufacturing, testing & delivery
Send your specification — we revert with a proposal based on the manufacturer's data.