The bottom valve of the suction pipe of centrifugal pump is also a kind of check valve, which is to prevent the liquid from flowing out of the pump before starting. It ACTS as a one-way valve to prevent the material in the inlet pipe of the pump from pouring into the pool and causing no material in the inlet pipe when the pump is stopped. In this way, the pump can be started again without filling the bottom valve of the pump, but with a filter screen, which can prevent the solid particles in the liquid from being sucked in and block the pipe and pump housing. Therefore, the bottom valve and the screen can become a combination, each has a different function.

If the inlet pipe of the centrifugal pump is lower than the inlet pipe of the centrifugal pump, for example, if the centrifugal pump is installed on the ground, the material below the ground must be extracted. The bottom valve should be installed at the end of the suction pipe of the centrifugal pump to filter impurities and protect the pump from being blocked. It can also check to ensure that the inlet pipe of the centrifugal pump is filled and filled with the pump.

If not installed bottom valve, once the pump stopped, the water absorption pipe will all leak out, and have to re - water, in order to reduce this trouble, install a bottom valve, to avoid water leakage and re - water.