The Function and Purpose of the Bottom Valve of the Centrifugal Pump

There are two working modes of centrifugal pump: self-filling and suction. Pumping stations equipped with large-flow centrifugal pumps, high degree of automation, and high water supply safety requirements should adopt self-filling. The apex of the casing of the self-filling pump should be lower than the lowest water level in the suction pool. When the centrifugal pump adopts the suction working mode, water must be drawn before the pump is started. Water diversion methods can be divided into two categories, one is the suction pipe with a bottom valve, and the other is the suction pipe without a bottom valve.

Role

(1) Manual water diversion Pour water into the pump from the water diversion hole on the top of the centrifugal pump, and open the exhaust valve at the same time. This method is only suitable for temporary water supply and small centrifugal pump occasions.

(2) Use the water in the pressurized pipe to invert the water. When there is often water in the pressurized pipe, and the water pressure is not high and there is no check valve, directly open the gate valve on the pressurized pipe to pour the water back into the pump. If the water pressure in the water pressure pipe is large and a check valve is installed behind the pump, a bypass pipe must be installed after the water gate valve to divert water as shown in the pump casing, as shown in the figure. There is a gate valve on the bypass pipe. The gate valve is opened when the water is diverted, and the gate valve is closed after the pump is filled with water. This method has simple equipment and is generally used by medium and small water pumps (when the diameter of the suction pipe is within 300mm).