The function of pump sends the bottom valve, why the centrifugal pump should add the bottom valve an

The function of pump sends the bottom valve, why the centrifugal pump should add the bottom valve and check valve?

The action of the bottom valve

There are two types of centrifugal pump: self - filling and suction.The pump station equipped with high flow centrifugal pump, high degree of automation and high water supply safety requirements is suitable for self-irrigation.The peak of the pump housing of the self-irrigation works should be lower than the lowest water level in the suction tank.When the centrifugal pump adopts the suction working mode, the water pump must be introduced before starting.The water diversion method can be divided into two categories, one is the suction pipe with the centrifugal pump bottom valve, the other is the suction tube without the bottom valve.

The action of the bottom valve of the centrifugal pump

(1) the water is pumped into the pump with water from the suction hole at the top of the centrifugal pump, while opening the exhaust valve.This method only applies to temporary water supply and for small centrifugal pumps.

(2) water pouring in a pressure pipe is used to water the water in the pressure pipe. When the water is often in the water, and the water pressure is not large enough to check the valve, directly open the gate valve on the pressure pipe and pour the water into the pump.If the water pressure in the pressure pipe is larger and the check valve is installed after the pump, it should be installed with the water gate valve to be installed as the pump shell, as shown in the figure.A gate valve is provided on the by-pass pipe, and the gate valve is opened when the water is drawn. The water is filled with pump, and the gate valve is closed.This method is simple and generally used in many medium and small pumps (the diameter of suction pipe is within 300mm).