Reasons and methods of filling water before starting the centrifugal pump

Centrifugal pump before the start, the first to be filled with water, in order to discharge the air inside the pump casing. The working principle of the centrifugal pump, the impeller rotates, the water by centrifugal force and is thrown to the outer edge of the impeller, the impeller center of the vacuum, water is sucked, forming a continuous working process of water pump. If you start the pump body is filled with water, but is filled with air, the air density is much less than the density of water, the impeller to rotate at the same speed, the centrifugal force generated by the centrifugal force of the air will be far less than water. This will gather in the impeller center, so that the impeller center can not form a sufficient vacuum to prevent water intake, affecting the formation of the continuous process of water pumps. Therefore, the centrifugal pump before starting, must first be filled with water, the air discharged in the body, in order to maintain the normal operation of the pump.
The centrifugal pump to the water pump and a water inlet pipe filled with water before, otherwise the pump is not pumping work. After the start of the centrifugal pump does not water, often because the air in the pump is not discharged, the water is not filled due to.
Before starting the pump, the water tank filled with water for sealing. Pump starts to pump water from the vacuum tank, the tank water level resulted in the formation of a certain degree of vacuum in the tank, into the water in the pool will be under the influence of the atmospheric pressure through the inlet into the tank, thus forming the water cycle, the pump started running. The water filling method has the following advantages: small hydraulic loss, high efficiency of pumping station, low labor intensity of technical personnel, easy to start, and is conducive to the realization of the automatic control of pump unit.
There are two kinds of main water filling method before startup: one is by the end of valve assembly with water valve, check valve, installed in the inlet pipe imports, the disadvantage of this method is that valve head loss is bigger, affect the efficiency of the pump device; the other is not the end of valve with water, the greatest advantage of this method is energy saving relative to the valve of the pumping station, can save 10% ~ 15%.