止回阀的安装是为了保证泵内的水流，从而保证泵的正常运行。因此，止回阀的安装位置可分为两种情况：

The installation of the check valve is to ensure the water flow inside the pump, thereby ensuring the normal operation of the pump. Therefore, the installation position of check valves can be divided into two situations:

一种安装在水泵前面的垂直吸管末端，也称为底阀。其目的是在不抽水的情况下向水泵注水一次，因为当水泵和泵前的吸管中没有水时，水泵只能空转，不能抽水，因此水泵必须充满水才能抽水。这种水泵的安装方法高于液位，也称为负压法。

A vertical suction pipe end installed in front of a water pump, also known as a bottom valve. The purpose is to inject water into the water pump once without pumping, because when there is no water in the pump and the suction pipe in front of the pump, the pump can only idle and cannot pump, so the pump must be filled with water to pump. The installation method of this water pump is higher than the liquid level, also known as negative pressure method.

另一个安装在水泵的后面。这种安装方法是在液位高于水泵的情况下，在启停水泵时，特别是对于母管水泵系统，不需要关闭水泵出口阀，以防止回流。

Another one is installed behind the water pump. This installation method is used when the liquid level is higher than the water pump, and when starting and stopping the water pump, especially for the main pipe water pump system, there is no need to close the water pump outlet valve to prevent backflow.

阀门生产厂家说泵出口必须安装止回阀.出口控制阀前的位置用于维修止回阀。一般泵的第1个出口是软连接(减震器)，其次是止回阀，然后是隔断阀(如蝶阀).闸阀.截止阀等）

The valve manufacturer said that a check valve must be installed at the pump outlet. The position in front of the outlet control valve is used for repairing the check valve. The first outlet of a typical pump is a soft connection (shock absorber), followed by a check valve, and then an isolation valve (such as butterfly valve), gate valve, globe valve, etc

先装止回阀，再装闸阀或蝶阀

Install the check valve first, then the gate valve or butterfly valve

优点：可保护止回阀，特别是在并联泵中，当泵不启动时，出口门关闭，另一个泵启动时，冲击力由闸阀或蝶阀承担。止回阀故障后，可关闭进出口阀隔离系统进行维修。

Advantages: It can protect the check valve, especially in parallel pumps. When the pump is not started, the outlet valve closes, and when another pump starts, the impact force is borne by the gate valve or butterfly valve. After the check valve malfunctions, the inlet and outlet valve isolation system can be closed for maintenance.

先安装闸阀或蝶阀，然后回阀

First install the gate valve or butterfly valve, then the return valve

优点：能保护蝶阀或闸阀，冲击力由止回阀承担。

Advantages: It can protect butterfly or gate valves, and the impact force is borne by the check valve.

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