LNG
Cryogenic valves engineered for liquefied natural gas processing and transportation. FLOWKS cryogenic service valves are tested to -196degC per BS 6364.
Recommended Solutions
Trunnion Mounted Ball Valve
Anchored ball design with spring-loaded seats for reliable sealing in high-pressure service. Side-entry and forged body options available.
Top Entry Ball Valve
Inline maintainable design allowing seat and seal replacement without removing the valve from the pipeline. Ideal for buried and welded pipelines.
Triple Offset Butterfly Valve
Metal-to-metal seal with zero friction, ideal for high-temperature and cryogenic service.
All-Welded DBB Valve
All-welded body DBB valve with extended bonnet for buried pipeline service. Zero external leakage design per ISO 15848.
Applications in LNG
Liquefaction Trains
LNG liquefaction plants compress and cool natural gas to -162degC using mixed refrigerant cycles (C3MR, AP-X). Cryogenic ball valves isolate liquefaction exchangers and LNG storage tank feed lines. Extended bonnet designs keep stem packing above 0degC, preventing frost accumulation and packing failure. Austenitic stainless steel (304L/316L) prevents brittle fracture at cryogenic temperatures.
LNG Storage & Loading
LNG storage tanks use cryogenic valves for fill, withdrawal, and boil-off gas management. Marine loading arms connect LNG carriers to terminal piping via cryogenic DBB isolation valves. Top-entry designs allow in-line maintenance without removing valves from cryogenic service, critical for continuous terminal operations.
Regasification Terminals
LNG import terminals regasify LNG using seawater vaporizers, submerged combustion vaporizers, or ambient air vaporizers. Cryogenic butterfly valves control seawater flow to vaporizer units. After vaporization, the natural gas enters the distribution pipeline through pressure letdown stations using globe control valves.
LNG Carrier Ships
LNG carriers use cargo handling systems with cryogenic valves for loading, unloading, and tank management. All-welded DBB valves eliminate body joint leaks in marine environments. Valves must withstand ship motion, vibration, and thermal cycling between ambient and cryogenic conditions. IGC Code compliance is mandatory.
Industry Standards
Valves for Cryogenic Service
Design and testing for cryogenic valves
Pipeline & Piping Valves
Pipeline valve specification
International Gas Carrier Code
Marine LNG carrier safety
Cryogenic Valves -- Industrial Valves
European cryogenic valve standard
Valves for Cryogenic Service
US cryogenic valve specification
Materials Available
- ●316L
- ●304L
- ●Aluminum Bronze
- ●Inconel 600
- ●Inconel 718
- ●9% Nickel Steel
Frequently Asked Questions
What is the purpose of extended bonnets on cryogenic valves?+
How are cryogenic valves tested?+
Why is austenitic stainless steel required for cryogenic service?+
What is boil-off gas (BOG) and how do valves handle it?+
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