1) The inlet and outlet valves are closed or blocked, or the impeller flow passage is blocked.
2) Motor running direction is wrong, the motor is short of phase, and the speed is very slow;
3) Air leakage of suction pipe;
4) The pump is not filled with liquid or there is air in the pump chamber;
5) Water supply is insufficient, the suction head is too high, and the bottom valve leaks water;
6) The pipeline resistance is too large, and the selection of water pump is not appropriate.
1) Cavitation occurred inside the pump;
2) Impeller imbalance;
3) The pump shaft is not concentric with the motor shaft;
4) Foundation bolts are loose;
5) Shaft bending;
6) Bearing wear.
The outlet valve is a part that can adjust the flow, and it can separate the pump and system when opening and shutting down for maintenance.
1) Speed will affect the flow rate and pump head.
2) Temperature will affect the suction height, NPSHr and inlet pressure.
3) Viscosity and density will affect power.
1) Quality of the seal itself
2) Process operation conditions
3) Installation accuracy
4) Accuracy of the host
5) Sealing auxiliary system
Prevent the water in the pump and inlet pipe from flowing back to the water tank after the pump stops, so that when the pump started next time, the pump is still full of water, and the pump can be started directly without filling the pump.