What is a check valve and what is the function of a water pump check valve

• What is a check valve?

A check valve is a valve with a circular disc as the opening and closing part. It relies on its own weight and the pressure of the medium to prevent the medium from flowing back. It is an automatic valve, also known as a non-return valve, a return valve or an isolation valve. The disc movement mode is divided into lift type and swing type. The structure of the lift check valve is similar to that of the stop valve, except that the valve stem that drives the disc is missing. The medium flows in from the inlet end (lower side) and flows out from the outlet end (upper side). When the inlet pressure is greater than the sum of the weight of the disc and its flow resistance, the valve opens. On the contrary, when the medium flows back, the valve closes. The disc of the swing check valve is inclined and can rotate around the axis, and its working mode is similar to that of the lift check valve. Check valves are often used as bottom valves in pumping devices to prevent water from flowing back. The combination of stop valves and stop valves can provide safe isolation. The disadvantage is that the resistance is large when closed and the sealing is poor.

• What is the function of a water pump check valve?

The main function of the check valve is to prevent the backflow of the medium, the reversal of the pump and the drive motor, and the discharge of the container medium.
Generally speaking, the water pump check valve refers to the prevention of the impact of high-pressure water backflow on the water pump impeller in the water pump water supply system. Due to some reason in the operation of the system, the water pump stops suddenly, the pressure in the pump disappears, and the high-pressure water connected to the water pump outlet will flow back to the water pump. If the outlet of the water pump is equipped with a check valve, it will be closed immediately to prevent high-pressure water from flowing back to the water pump. If the check valve is not installed at the outlet of the water pump, the high-pressure water will flow back to the water pump, and the water pump impeller will reverse under the impact of the high-pressure water. In this case, the water pump impeller will inevitably bear the impact load of the high-pressure water, and in severe cases, the impeller and other parts will loosen and be damaged. In this way, the impeller may be thrown out during the operation of the water pump, which will pose a great threat to the safety of the operator.