Rubber flap check valve introduces the how to install the check valve
How to determine the installation position of the rubber flap check valve? What is the difference between the front installation of the pump and the installation of the rubber flap check valve after the pump, and where does the installation before the pump apply?
Check valves are usually used together with other valves. When used with other valves, where should the rubber flap check valves be in stalled? Let's discuss it together.
Rubber flap check valve, 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 rubber flap check valve flap closes. It can effectively prevent the medium in the pipeline from flowing back, which plays a role in ensuring the safety of the pipeline. Great effect.
According to the structure of t he rubber flap check valve, it c an be divided into three types: lift check valve, swing check valve and butterfly check valve.
Lift rubber flap check valves can be divided into two types: vertical and straight-through. Swing check valves are divided into three types: single, double and multiple. Butterfly check valves are divided into butterfly double flaps and butterfly single flaps. The above types of check valves can be divided into four types in connection form: threaded connection, flange connection, welding and wafer connection.
The check valve is installed to ensure the flow direction of the water flow inside the pump, so as to ensure the normal operation of the pump. Therefore, regarding the installation position of the check valve, whether it is installed before or after the water pump, there are two situations:
One is installed at the end of the vertical suction pipe in front of the pump, also called a bottom valve. The purpose is to fill the pump without pumping water once, because when there is no water in the pump and the suction pipe in front of the pump, the pump can only be idling and cannot pump water, so the pump must be filled with water to pump out water. The installation of this kind of water pump is a method when it is above the liquid level, also called negative pressure method.
The other is installed behind the pump. This installation method is that when the liquid level is higher than the water pump, it is convenient to start and stop the water pump without closing the water pump outlet valve, especially for the main control water pump system to prevent backflow.
The rubber flap check valve m ust be installed at the outlet of the pump and before the outlet control valve in order to check the check valve. Generally, the first outlet of the pump is the soft connection (shock absorber), the next is the check valve, and then the isolation valve (such as butterfly valve, gate valve, stop valve, etc.)
Install th e rubber flap check valve first a nd then the gate valve or butterfly valve.
Advantages: It can protect check valves, especially in parallel pumps. When one pump does not start, its outlet door is closed, and when the other pump starts, 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.
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