Submersible pump water flow problem how to do?

Submersible pump often causes and treatment flow is insufficient or no water during operation: the pump mounting height is too high, the immersion depth of the impeller is not enough, leading to pump out the water drops; control the water pump installation elevation of allowable deviation, can not arbitrarily expand; steering pump reverse pump motor idling operation before the first test, check the steering with the water pump; use process of the power supply should check whether to change the water outlet valve can not be opened. Check valves, and often for the maintenance of the valve; water pipeline is not smooth or impeller is blocked. The blockage cleaning pipe and impeller, often salvage debris in the reservoir; water pump at the bottom wear ring is badly worn or clogged. Cleaning or replacement of the wear ring; liquid density is too large or too high viscosity. Look for the reasons for the change of water quality and manage it. Reinforcement or replacement of the impeller; more than one pump common pipeline output, no one-way valve installed or one-way valve seal. Check the reason after the installation or replacement of one-way valve.