低温止回阀

       DH61F低温止回阀的工作原理是在一个方向流动的流体压力作用下，阀瓣打开；流体反方向流动时，由流体压力和阀瓣的自重合阀瓣作用于阀座，从而切断流动。DH61F低温止回阀又称为逆流阀、逆止阀、背压阀、单向阀。这类阀门是靠管路中介质本身的流动产生的力而自动开启和关闭的，属于一种自动阀门。止回阀用于管路系统，其主要作用是防止介质倒流、防止泵及其驱动电机机反转，以及容器内介质的泄放。 DH61F低温止回阀整体整体锻造而成，毛坯需经过低温处理后再精加工，该阀可以在-196℃的情况下耐压到42MPa,目前广泛应用在天然气行业。阀门通过承插焊和管道连接，具有安装方便 连接牢固 安全稳定等优点。

低温止回阀

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.

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