Where should the check valve be installed?
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Release Time：2020-09-28
How to determine the installation position of the check valve? What is the difference between installing the check valve before and after the pump? Where was the pump installed before? The check valve should usually be used with other valves. When used with other valves, where should the check valve be installed?
How to determine the installation position of the check valve? What is the difference between installing the check valve before and after the pump? Where was the pump installed before? The check valve should usually be used with other valves. When used with other valves, where should the check valve be installed?
The check valve, also known as the check valve, is an automatic valve that can close and open the valve according to the pressure of the flowing medium in the pipeline. The medium stops flowing and the check valve closes to prevent the medium in the pipeline from flowing back, which plays a big role.
A check valve is installed to ensure the water flow in the pump and ensure the normal operation of the pump. Therefore, the installation position of the check valve can be installed in front of or behind the pump. It depends on the situation. Generally, there are two types: one is installed at the end of the vertical suction pipe before the pump, and the other is the installation method of the pump with the liquid level higher than the pump. This method is usually used for secondary water supply. Since the liquid level is higher than the pump, there is no need to close the pump valve when starting the pump, so the check valve must be installed behind the pump.
To repair the check valve, a check valve must be installed at the pump outlet and in front of the outlet control valve. The first outlet of an ordinary pump is a soft connection (shock absorber), then a check valve, and then a shut-off valve (such as butterfly valve, gate valve, shut-off valve, etc.).
1. Before installing the gate valve or butterfly valve, please install the check valve.
Advantages: It can protect the check valve. Especially in parallel pumps, one pump cannot be started, and when the other pump is started, the impact force is borne by the gate valve or butterfly valve.
Disadvantages: Who will protect the gate valve or check valve? The valve of the butterfly valve is easy to break.
2. First install the gate valve or butterfly valve, and then install the check valve
Advantages: can protect the butterfly valve or gate valve, the impact force depends on the check valve
Disadvantages: Who will protect the check valve? The check valve is switched by pressure difference. The high pressure of the gun tube will open the high-pressure pump, and the unstable flow will repeatedly switch the check valve, which will affect the service life of the check valve.
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