We Are Serving the API6D & LNG Industry
Valves for LNG are classified as one of the cryogenic service valves, and they are also categorized by application and facilities where the valves are used.
Various types of valves are used for this service, including gate, globe, check, ball and butterfly valves. Many automated valves and control valves are also used with air cylinders or air motors mounted on the valves.
In LNG operations, valves can regularly encounter temperatures below -320 F (-196 C) and pressures above 750 pounds per square inch (psi). They are also subjected to periodic variations in temperatures known as “thermal cycling,” which can result in hardware expansion as well as shrinkage and material stresses. These factors make reliable, long-term valve operation an engineering challenge.
Efficient, reliable valve performance is critical to the success of any LNG/CNG operation, and seals play a central role in keeping valves up and running. But their job is made difficult by the demanding service conditions.
Sealing success factors:
To provide superior protection against leakage in cryogenic valves for LNG, seals should have:
1. Jacket matrial that tolerates thermal cycling
2. An energizer to compensate for shrinkage
3. Anti-extrusion lip geometry
With the right material formulation and design, they can actually provide much better sealing service than alternative technologies, such as metallic seals, elastomeric seals and packings—especially in dynamic applications. In fact, the right polymer seals can actually help engineers achieve new levels of valve performance.
Sealing at cryogenic temperatures has its own unique set of challenges. JST has a wide range of solutions for cryogenic sealing applications. Cryogenic seals require skillful design by combining the right type of material, seal configuration, and spring energizer to overcome the dimensional fluctuation of all mating parts.
LOW TEMPERATURE CRYOGENIC SEALS APPLICATION:
Rocket propulsion Filling Systems
LNG Compressors
Cryogenic Valves Stem Seals
Cryogenic Butterfly Seat Seals
Cryogenic Transfer Pumps
LNG Fueling Systems
Petroleum
Scientific Instrumentation
Specialty Gas Manufacturing
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