低温止回阀
商品详情
性能特点
技术参数
低温止回阀是专用于低温介质（如液化天然气LNG、液氮、液氧、液氩、液态二氧化碳等）输送系统的关键阀门。其核心功能是防止低温介质倒流，保护上游设备（如低温储罐、低温泵、气化器等）安全，确保低温系统在极端工况下的稳定、稳定运行。
低温止回阀核心特点：
低温止回阀超低温材料：阀体、阀盖等主要部件采用耐低温的奥氏体不锈钢（如304、316L），其低温冲击韧性优良，能有效防止低温脆性。
低温止回阀延长阀盖设计：采用长颈阀盖结构，使阀杆填料函远离低温流体，填料函的温度保持在0℃以上，防止其冻结失效，确保密封和操作正常。
低温止回阀特殊密封设计：采用改性聚四氟乙烯（PTFE）、石墨、不锈钢金属密封等低温适应性好的材料，确保在低温下的密封性能。
低扭矩操作：精心设计的阀瓣和枢轴，即使在低温下也能灵活启闭，操作力矩小。
低温止回阀防火与安全：许多产品设计符合防火安全标准，在极端情况下仍能保持一定的密封性。
低温止回阀典型应用：
LNG产业链：LNG接收站、液化厂、加注站、储罐的进出口管线。
空分行业：液氮、液氧、液氩的储运和设备保护。
工业气体：液态二氧化碳、液态乙烯等介质的输送系统。
低温罐车：铁路或公路低温槽车的装卸系统。
Product Overview of Cryogenic Check Valves
Cryogenic Check Valves are specialized valves designed for use in cryogenic media (such as Liquefied Natural Gas (LNG), liquid nitrogen, liquid oxygen, liquid argon, liquid carbon dioxide, etc.) transmission systems. Their core function is to prevent the backflow of cryogenic media, protecting upstream equipment (e.g., cryogenic storage tanks, cryogenic pumps, vaporizers) ensuring the stable reliable operation of the cryogenic system under extreme conditions.
Key Features:
Cryogenic Materials: Primary components like the valve body bonnet are made cryogenic-grade austenitic stainless steel (e.g., SS304, SS316L), which offers excellent low-temperature impact toughness effectively prevents brittle fracture.
Extended Bonnet Design: Features a long-neck bonnet structure that positions the stem packing box away the cryogenic fluid. This ensures the packing temperature remains above 0°C (32°F), preventing it freezing failing, thus guaranteeing proper sealing operation.
Specialized Sealing: Utilizes sealing materials suitable for low temperatures, such as modified PTFE, graphite, stainless steel metal seals, to ensure reliable sealing performance in cryogenic environments.
Low Torque Operation: The disc pivot are meticulously designed to ensure smooth opening closing even at cryogenic temperatures, requiring minimal operating torque.
Fire-Safe Design: Many products are designed to comply with fire-safe standards, maintaining a degree of sealing integrity in extreme events.
Typical Applications:
LNG Industry: Inlet/outlet pipelines for LNG receiving terminals, liquefaction plants, fueling stations, storage tanks.
Air Separation Industry: Storage, transportation, equipment protection for liquid nitrogen, liquid oxygen, liquid argon.
Industrial Gases: Transfer systems for media like liquid carbon dioxide liquid ethylene.
Cryogenic Tankers: Loading unloading systems for railway road tankers.