Durable Valves For Lng And Industrial Cryogenic Systems
The cryogenic valve ensures reliable flow control in extreme low-temperature environments like lng systems, featuring corrosion-resistant stainless steel for durability up to -196°c and pn40 pressure ratings.
The Cryogenic Valve is a specialized flow control device engineered for extreme low-temperature environments, providing reliable shutoff and throttling in liquefied natural gas (LNG), industrial gases, and cryogenic fluid systems. Designed to withstand temperatures as low as -196°C, this low temperature valve features extended bonnets and specialized packing to prevent stem freeze-up and material embrittlement, ensuring safe operation in harsh cryogenic conditions. Constructed from austenitic stainless steels like 304L or 316L, with optional bronze or aluminum alloys for specific applications, it offers superior corrosion resistance against moisture-induced pitting and thermal contraction stresses, making it essential for LNG terminals, air separation plants, and medical gas distribution.
Compliant with API 6D for pipeline valves and BS 6364 for cryogenic service, the cryogenic gate valve or ball variant is available in sizes from 1/2" to 24" (DN15 to DN600) with flanged, welded, or threaded ends per ASME B16.5 and B16.25. It supports pressure ratings up to PN40 (ANSI Class 150-600) and full vacuum capability, with extended stems (250-500mm) to keep the packing above the cold zone and bellows seals for zero-leakage in hazardous applications. The valve's low thermal conductivity materials minimize heat ingress, preserving cryogenic fluid integrity, while fire-safe designs per API 607 ensure reliability in emergency scenarios. Testing includes cryogenic hydrostatic tests at -196°C and helium leak detection for bubble-tight shutoff, confirming compliance with EN 12516 for pressure equipment.
The LNG ball valve variant features a trunnion-mounted ball with floating seats for low torque operation, reducing actuator requirements in automated systems, while gate types offer full-port flow for minimal pressure drop (Cv up to 15,000). Its industrial cryogenic valve construction resists brittle fracture through impact-tested materials (Charpy V-notch >27J at -196°C), ensuring safety in seismic or vibration-prone installations. Surface treatments like electropolishing or passivation enhance corrosion resistance, preventing oxidation in moist cryogenic environments, and optional position indicators support remote monitoring via SCADA. With tensile strengths above 515 MPa and yield strengths of 205 MPa, the valve withstands thermal cycling without deformation, ideal for regasification plants or hydrogen liquefaction facilities.
Compared to standard valves, the cryogenic valve excels in preventing leaks and ice formation, with a 3-5 times longer service life due to specialized metallurgy and design features like insulated bonnets. Its compact footprint suits space-constrained LNG carriers or cryogenic storage tanks, while customizable actuators (pneumatic or electric) enable automation for precise flow control. The valve's ability to handle multiphase flows without galling or seat damage makes it superior for dynamic applications, reducing operational costs by minimizing downtime in critical cryogenic processes.
Addressing challenges like thermal contraction, fugitive emissions, and material brittleness in low temperature valve systems, this cryogenic gate valve incorporates double-block-and-bleed configurations and secondary seals for enhanced safety. Its compatibility with international standards like MSS SP-134 for cryogenic valves ensures global applicability, from offshore FPSOs to biomedical cryostorage. Whether isolating LNG transfer lines or regulating helium flows in superconductors, the Cryogenic Valve delivers unmatched reliability, safety, and efficiency for extreme low-temperature industrial operations.
Cryogenic valves are designed to handle extremely low temperatures and prevent leakage of sensitive cryogenic fluids. While various types exist, all share a basic feature: a tight shut-off to ensure safety and efficiency.
Triple-offset butterfly valves are ideal for cryogenic service due to their non-friction, metal-to-metal seal that ensures bubble-tight shut-off. They provide fast opening/closing and are well-suited for remote operation. Example: Durco TX3 with excellent shutoff, low torque, and reduced wear.
Featuring a spherical body and a disc that rotates 90° to the seat plane, these valves provide long-term sealing. However, they are not suitable for high flow rates due to erosion risks. A full Stellite trim is recommended to reduce wear since cryogenic fluids lack lubricity.
Widely used in liquid gas applications, double-seal ball valves (e.g., L&T, AMPO Poyam) provide excellent flow characteristics and a tight seal. Their design incorporates a vapor space that keeps gland packing near ambient temperature, reducing thermal conductivity. Best for unrestricted flow paths, though seals and the ball may wear over time.
Equipped with a wedge-shaped gate, these valves ensure minimal pressure drop when fully open, making them desirable for large-size applications. Brands like Poyam, L&T, and NEWCO Douglas-Chero are commonly used. However, gate valves are more difficult to actuate compared to butterfly valves and are prone to wear under frequent operation. An advantage: metal-to-metal sealing avoids cold flow issues seen in Teflon-sealed ball valves.
| Organization | Standard | Description |
|---|---|---|
| ANSI | American National Standards Institute | General industrial standards |
| API | American Petroleum Institute | Standards for oil and gas industry |
| ASME | American Society of Mechanical Engineers | Boiler and pressure vessel codes |
| BS | British Standards | UK national standards |
| GB, JB, HG | China Valve Standards | Chinese national and industry standards |
Upstream, midstream, and downstream operations, including drilling, refining, and transportation.
Handling corrosive and hazardous chemicals in various chemical plants.
Steam, water, and fuel systems in thermal, nuclear, and hydroelectric plants.
Municipal water supply, wastewater treatment, and industrial water management.
Heating, ventilation, and air conditioning systems in commercial and industrial buildings.
Sterile and hygienic applications, precise flow control in sensitive industries.
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