什么是止回阀？
止回阀一般安装在管道中以防止倒流。止回阀基本上是一个单向阀，其中水流可以自由地单向运行，但如果水流转向，阀门就会关闭，以保护管道、其他阀门、泵等。如果水流转向而没有安装止回阀，就会发生水锤。水锤往往以极大的力量发生，很容易损坏管道或部件。
止回阀用在哪里？
止回阀被用于许多不同的应用中。例如，它们通常被放置在泵的出口侧，以保护泵免受倒流。离心泵是最常见的水泵类型，没有自吸功能，因此止回阀对于保持管道内的水是必不可少的。此外，止回阀还经常被用于HVAC系统（供暖、通风和空调系统）中。例如，HVAC-系统用于大型建筑，其中冷却剂被泵送到许多层楼上。在这里安装止回阀是为了确保冷却剂不被冲回地面。
CPI止回阀是为高压应用而设计的，在这些应用中，反向流动和泄漏必须保持在最低限度。典型的应用包括发动机、泵和压缩机气缸/填料润滑和液压系统。这些止回阀中相对坚硬的弹簧有助于提高电路的可靠性。
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