Manual Water Pump - manufacturer, factory, supplier from China

Centrifugal pump does not start after the start of water, why the centrifugal pump does not start after the start of water pump does not start after the water is what is the reason 1. The inlet pipe and the pump body air (1) before the start of centrifugal pump is not filled with enough water, and sometimes it seems Irrigation water has overflowed from the vent, but did not turn the pump shaft to air completely discharged, resulting in a little air remaining in the inlet pipe or pump body. (2)...