1. There are many elbows on the inlet pipeline of the pipeline centrifugal pump

If there are many elbows used in the water inlet pipeline, it will increase the local water flow resistance. And the elbow should turn in the vertical direction, and it is not allowed to turn in the horizontal direction, so as not to collect air.

2. When installing the water inlet pipeline, the horizontal section is horizontal or upturned

Doing so will accumulate air in the water inlet pipe, reduce the vacuum degree of the water pipe and the water pump, reduce the water suction head of the water pump, and reduce the water output. The correct way is: the horizontal section should be slightly inclined towards the water source, and should not be horizontal, and should not be raised upwards.

3. The water inlet of the pipeline centrifugal pump is directly connected to the elbow

This will make the water flow unevenly distributed through the elbow and into the impeller. When the diameter of the water inlet pipe is larger than the water inlet of the pump, an eccentric reducing pipe should be installed. The flat part of the eccentric reducer should be installed on the top, and the inclined part should be installed on the bottom. Otherwise, the air will gather, the water output will be reduced or the water will not be pumped, and there will be impact sounds. If the diameter of the water inlet pipe and the water inlet of the pump are equal, a straight pipe should be added between the water inlet of the pump and the elbow, and the length of the straight pipe should not be less than 2 to 3 times the diameter of the water pipe.

If the water outlet is above the normal water level of the water outlet, although the pump head is increased, the flow rate is reduced. If the water outlet must be higher than the water level of the water outlet due to terrain constraints, elbows and short pipes should be added to the nozzle to make the water pipe siphonic and reduce the height of the water outlet.

a. The distance between the water inlet of the water inlet pipe and the bottom of the water inlet pool and the pool wall is less than the diameter of the water inlet. If there is sediment and other dirt at the bottom of the pool, and the distance between the water inlet and the bottom of the pool is less than 1.5 times the diameter, it will cause poor water intake or suck in sediment and debris during pumping, blocking the water inlet.

b. When the water inlet of the water inlet pipe is not deep enough, this will cause a vortex on the water surface around the water inlet pipe, which will affect the water inlet and reduce the water output. The correct installation method is: the water depth of small and medium-sized water pumps shall not be less than 300-600mm, and the depth of large-scale water pumps shall not be less than 600-1000mm.

If installed in this way, the valve cannot close by itself, causing water leakage. The correct installation method is: the water inlet pipe with the bottom valve, the bottom section is preferably vertical. If it cannot be installed vertically due to terrain constraints, the angle between the axis of the water pipe and the horizontal plane should be more than 60°.