Cryogenic Butterfly Valves

A cryogenic butterfly valve is a specialized valve designed for handling cryogenic fluids in pipeline systems. It is used to open, close, and regulate flow while maintaining safe and reliable operation under extremely low temperatures, often reaching as low as –196°C. Unlike standard butterfly valves, cryogenic versions are constructed with low-temperature-toughness materials and incorporate special structural designs that ensure smooth operation, excellent sealing performance, and durability in harsh cryogenic environments.

Cryogenic butterfly valves are essential in industries such as liquefied natural gas (LNG), liquefied petroleum gas (LPG), air separation plants, and other low-temperature applications. Their robust design ensures operational safety, prevents leakage, and allows for precise control of ultra-cold media.

Cryogenic environments place extreme demands on valve materials. Ordinary metals may become brittle or lose toughness at ultra-low temperatures, potentially leading to cracks or mechanical failure. Therefore, the body, disc, and stem of a cryogenic butterfly valve must be manufactured from low-temperature-toughness steels or alloys, such as 304L or 316L stainless steel and low-temperature carbon steel. These materials provide excellent impact resistance and maintain structural integrity under both thermal contraction and pipeline pressure fluctuations.

VERVO cryogenic butterfly valves are engineered for temperatures down to –196°C, making them suitable for LNG pipelines, LPG systems, air separation units, and other cryogenic applications. All parts are designed for replaceability, and the valves support in-line maintenance, simplifying service and reducing downtime.

Size, Pressure, and Connection Options

Size Range: 3 Inch to 120 Inch (DN80 to DN3000)

Pressure Rating: ASME Class 150–600 (PN20–PN100)

Body Materials: Stainless steel

End Connections: Wafer, Lug, RF (Raised Face), BW (Butt Weld)

Operation Methods: Pneumatic, Electric

This flexibility allows cryogenic butterfly valves to be integrated into a wide variety of industrial piping systems while meeting strict performance and safety requirements.

Cryogenic butterfly valves are specifically engineered for cold performance and long-term reliability. Their unique design elements include:

• Cold-Tough Body: Manufactured using low-temperature steels such as ASTM A352 LCB/LCC or stainless steel grades CF8M/CF3M, the valve body remains tough and resilient even at ultra-low temperatures, preventing brittle fracture and ensuring structural stability.
• Deep Cold Seals: Valve seats are designed with materials like modified PTFE (RPTFE), PCTFE, or specialized rubber (FFKM). These materials maintain elasticity and provide effective sealing even in extreme cold. Common sealing types include:
• Soft Seal: Ensures bubble-tight sealing in both directions, meeting standards such as ISO 5208 A or MSS SP-82.
• Double/Triple Offset Metal Seal: Provides durability and long service life, ideal for handling large temperature swings or contaminated fluids.
• Long Neck Bonnet: A defining feature of cryogenic butterfly valves, the extended stem moves packing and operating components away from the cryogenic flow. This design prevents freezing, reduces operational friction, and ensures smooth valve movement.
• Blow-Out Proof Stem: The T-head stem design enhances safety by preventing the stem from being ejected in the event of top seal failure, ensuring reliable operation under pressure.
• Pressure Relief: Some cryogenic butterfly valves incorporate an internal pressure relief channel to prevent valve damage due to accidental overpressure, enhancing system safety.

Cryogenic butterfly valves are widely used in industries that require safe handling of ultra-low-temperature fluids, including:

LNG terminals and pipelines

LPG storage and distribution

Air separation units (oxygen, nitrogen, argon)

Industrial gas processing plants

Petrochemical and chemical industries

Their combination of robust construction, precise flow control, and ultra-low-temperature compatibility makes them ideal for critical cryogenic systems worldwide.

As a leading cryogenic butterfly valve manufacturer in China, VERVO specializes in designing valves capable of withstanding extreme temperatures and pressures. Our valves offer:

Reliable operation at –196°C

Long service life with minimal maintenance

Flexible sizes and pressure ratings for diverse systems

Safe and efficient performance in critical cryogenic pipelines

With VERVO cryogenic butterfly valves, industries can ensure safe, efficient, and precise control of ultra-low-temperature media in even the most challenging environments.