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How To Install Check Valve

 Today we will discuss the check valve installation position. So how to determine the installation position of the check valve? What is the difference between the front of the pump and the check valve after the pump, and where is the front of the pump suitable?
Check valves are usually used in conjunction with other valves. Where should they be installed when used with other valves? cast iron check valve supplier to share with you.
Gost check valve china (also called check valve) is an automatic valve. It relies on the pressure of the flowing medium in the pipeline to push the valve flap to close and open the valve. When the medium stops flowing, the check valve flap is closed. It can effectively prevent the medium in the pipeline from flowing backward, which plays a role in ensuring the safety of the pipeline Great effect.
According to the structure of the check valve, it can be divided into three types: lift check valve, swing check valve and butterfly check valve.
Lift check valve can be divided into two types: vertical and straight. Swing check valve is divided into three types: single, double and multi-lobe. The butterfly check valve is divided into butterfly double flap and butterfly single flap. The above types of check valves can be divided into four types of screw connection, flange connection, welding and wafer connection.
The check valve is installed to ensure the flow direction of the water flow inside the pump, thereby ensuring the normal operation of the pump. Therefore, regarding the installation position of the check valve, whether it is installed before or after the pump can be divided into two cases:
One is the end of the vertical suction pipe installed in front of the pump, also called the bottom valve. The purpose is to fill the pump once without pumping water. Because there is no water in the pump and in the suction pipe in front of the pump, the pump can only pump when it is idling, so the pump must be filled with water to pump water. This kind of water pump installation is a method when the liquid level is higher, also called negative pressure method.

Gost Check Valve China
Gost Check Valve China

The other is installed behind the water pump. This installation method is in the case where the liquid level is higher than the water pump, which makes it convenient to start and stop the water pump without closing the pump outlet valve, especially for the mother-controlled water pump system to prevent backflow.
Cast iron check valve must be installed at the pump outlet, in front of the outlet control valve, in order to repair the check valve. The first outlet of the pump is usually a soft connection (shock absorber), followed by a check valve, and then a shutoff valve (such as a butterfly valve, a gate valve, a stop valve, etc.)
1.Install check valve first and then gate or butterfly valve
Advantages: It can protect the check valve, especially in parallel pumps. When one pump is not started, its outlet door is closed, and when the other pump is started, the impact force is borne by the gate valve or butterfly valve. After the check valve fails, the inlet and outlet valve isolation system can be closed for repair.
Disadvantage: Who will protect the gate valve or butterfly valve? There has been a case where the valve plate of a butterfly valve was damaged.
2.Install gate valve or butterfly valve first and then check valve
Advantages: It can protect the butterfly valve or gate valve, and the impact force is borne by the check valve.
Disadvantages: Whoever protects the check valve, the check valve is opened and closed by the pressure difference. If the pressure of the main pipe is high, the pressure of the pump is high. If the flow used is unstable, the check valve will open and close repeatedly. Affects the check valve life. And the check valve is broken, especially the mother control system, which needs to be shut down before repairs can be made.
In general, due to the frequent opening and closing of check valves, the internal connection parts and sealing parts are prone to damage. In order to facilitate repair and prevent the entire system from being shut down due to check valve failure, from this perspective, check valves The valve will be installed before the outlet gate valve or butterfly valve. Do you see this basically?

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