低温高压止回阀产品介绍:

   低温高压止回阀是一款专为严苛工况设计的阀门，主要用于防止介质倒流，确保系统安全稳定运行，属于自动阀门。它能有效避免泵及驱动电动机反转，以及容器介质的异常泄放，还可用于给压力可能超过系统压力的辅助系统提供补给的管路上。

低温高压止回阀产品特点:

    耐低温性能：采用特殊处理的不锈钢等材料，能在-196℃甚至更低的极寒温度下，依旧保持良好的机械性能与密封性能，确保阀门正常运作。

    高压力承受能力：可承受高达35MPa甚至更高的压力，满足高压环境下的使用需求。

    特殊的密封性能：运用特殊的密封结构与材料，在低温高压条件下也能有效防止泄漏，保障系统的密封性。

    流阻小，寿命长：阀瓣经过特殊设计，如镀铬或氮化处理，降低流阻的同时，提高了表面硬度，延长了阀门的使用寿命。

    开关灵活：能迅速响应介质流动状态的变化，及时开启和关闭，有效防止介质倒流。

低温高压止回阀工作原理:

   当介质在管道中按规定方向正常流动时，介质的压力推动阀瓣，使其克服自身重力及弹簧的作用力（如有弹簧结构），自动开启，介质得以顺利通过阀门。而当介质停止流动或出现倒流趋势时，阀瓣在自身重力、介质反向压力以及弹簧回复力（如有）的共同作用下，迅速回落至阀座上，紧密贴合，从而阻断介质倒流，保护系统安全。

低温高压止回阀技术参数:

   公称通径：DN6 - DN100mm（可根据实际需求定制更大或更小口径）

   公称压力：16MPa、25MPa、35MPa、50MPa等

   适用温度：-253℃ ～ +80℃

   阀体材质：锻造SS304、SS316、SS304L、SS316L等不锈钢材质

   阀盖材质：与阀体材质相同或采用H62等适配材料

   阀瓣材质：堆焊司太立合金，增强耐磨性和耐腐蚀性

   填料、密封圈材质：PTFE（聚四氟乙烯）、紫铜等，确保良好的密封性能

   连接方式：承插焊、对焊连接的牢固性和密封性

低温高压止回阀应用领域:

   气体液化与空分设备：在氧气、氮气、氩气等气体的液化和分离过程中，用于防止介质倒流，保障设备稳定运行。

   天然气液化与储运：广泛应用于液化天然气（LNG）的生产、储存和运输管道，确保LNG在低温高压环境下的安全输送。

   液态气体贮槽及槽车：如液态氧、氮、氩、氢、二氧化碳等低温贮槽及槽车，防止介质泄漏和倒流。

   能源与石化行业：在石油炼制、化工生产等过程中，用于处理低温高压的介质，保障生产流程的连续性和安全性。

   航天、核工业与铁道等行业：满足这些特殊领域对低温高压环境下流体控制的严格要求 。

低温高压止回阀安装与维护:

   安装前：必须彻底冲洗和清除管道中残存的杂质，避免杂质进入阀门，影响阀门的正常工作。

   安装时：注意阀门的流向，确保与介质的流动方向一致；可在水平或立式管路上安装，但需根据实际工况选择合适的安装方式，以确保阀门性能的正常发挥。

   安装后：定期检查阀门的密封性能、阀杆的灵活性等，如发现密封面磨损、垫片老化等问题，应及时更换相关部件；为了阀门的正常使用，尽可能在管路进口处安装过滤器，防止杂质卡在阀瓣，导致阀门止回功能失效

Product Introduction of Low - Temperature  High - Pressure Check Valve

The low - temperature  high - pressure check valve is a valve specifically designed for harsh working conditions. As an automatic valve, it is mainly used to prevent the backflow of media, ensuring the safe  stable operation of the system. It can effectively prevent the reverse rotation of pumps  drive motors, as well as the abnormal discharge of media in containers. Additionally, it can be used in pipelines that supply auxiliary systems  the pressure may exceed the system pressure.

Product Features of Low - Temperature  High - Pressure Check Valve

- Outstanding Low - Temperature Resistance: High - quality materials such as specially treated stainless steel are used. The valve can maintain good mechanical  sealing properties even at extremely low temperatures of - 196°C  lower, ensuring its normal operation.

- High Pressure - Bearing Capacity: It can withstand pressures up to 35MPa  even higher, meeting the requirements of high - pressure environments.

- Reliable Sealing Performance: By applying special sealing structures  materials, it can effectively prevent leakage under low - temperature  high - pressure conditions, guaranteeing the tightness of the system.

- Low Flow Resistance  Long Service Life: The valve disc is specially designed, for example, through chrome - plating  nitriding treatment. This reduces the flow resistance while increasing the surface hardness, thus extending the valve's service life.

- Flexible Opening  Closing: It can quickly respond to changes in the flow state of the media, opening  closing in a timely manner to effectively prevent the backflow of media.

Working Principle of Low - Temperature  High - Pressure Check Valve

When the media flow normally in the pipeline in the specified direction, the pressure of the media pushes the valve disc, enabling it to overcome its own gravity  the force of the spring (if there is a spring structure),  then the valve opens automatically, allowing the media to pass through smoothly. When the media stop flowing  show a tendency of backflow, the valve disc, under the combined action of its own gravity, the reverse pressure of the media,  the restoring force of the spring (if any), quickly drops back onto the valve seat  fits tightly, thereby blocking the backflow of media  protecting the safety of the system.