A check valve is a device that allows fluid to flow in only one direction. They have two ports, one as the media inlet and the other as the media output. Because they only allow one-way flow of medium, they are usually called "one-way valves" or "check valves". Xiaobian tells you that the main purpose of the check valve is to prevent backflow of the system.

止回阀依靠压差工作。它们需要阀门输入侧的压力高于输出侧的压力才能打开阀门。当出口侧压力较高（或输入侧压力不够高）时，阀门将关闭。上阀阀门厂告诉你根据阀门类型，关闭机制是不同的。与其他阀门不同，它们不需要手柄、杠杆、执行器或人工即可正常工作。它们通常安装在回流会导致问题的应用程序中。但是，由于它们是止回阀，因此它们是解决潜在问题的廉价、有效且简单的解决方案。如果回流被污染，回流可能会导致问题，因此会污染上游介质。

The check valve works by pressure difference. They require the pressure on the input side of the valve to be higher than the pressure on the output side to open the valve. When the outlet side pressure is high (or the input side pressure is not high enough), the valve will close. The valve factory tells you that the closing mechanism is different according to the valve type. Unlike other valves, they do not require handles, levers, actuators, or labor to function properly. They are usually installed in applications where reflow can cause problems. However, since they are non-return valves, they are inexpensive, effective and simple solutions to potential problems. If the backflow is contaminated, the backflow may cause problems and thus contaminate the upstream medium.

下水道将有一个止回阀，以确保废物可以离开但不会重新进入系统。如果回流会对上游设备造成损坏，并且只能允许介质沿一个方向流动，则也可以使用它们。上阀阀门厂告诉你反渗透过滤器只能让水从一个方向通过，因此在下游安装了一个单向阀来防止这种情况。有各种尺寸、设计和材料，以确保每个应用都有一个止回阀。

The sewer will have a check valve to ensure that waste can leave but not re-enter the system. They can also be used if backflow can damage the upstream equipment and only allow the media to flow in one direction. The valve manufacturer told you that the reverse osmosis filter can only allow water to pass in one direction, so a one-way valve is installed at the downstream to prevent this situation. There are various sizes, designs and materials to ensure that each application has a check valve.

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