Inlet pipe and pump body with air :
1.Before the start of the pump is not filled with enough water, sometimes looks like the water has been poured from the vent overflow, but did not turn the pump shaft to the air completely discharged, resulting in a little air left in the water pipe or pump body.
2.Contact with the water pump inlet of the horizontal application of reverse flow direction, fell more than 0.5% slope, connect one end of the highest import pumps, do not completely level. If the upward tilt, will be retained within the inlet air, reduce water pipes and pumps in the vacuum, the impact of water.
3.Pump packing has been used for long-term wear or packing pressed too loose, discharge gap caused by the large amounts of water from filling with the shaft sleeve, the external air gap into the pump from the inside, affected the water.
4.Because of the long-term potential of the water inlet pipe, the pipe wall corrosion appear holes, water pump works, the water continued to decline, when these holes exposed, the air enters the people from the hole into the water pipe.
5.The water inlet pipe bends in the cracks, the water inlet pipe and the water pump connection at the small gap, it is possible to make the air into the water inlet pipe.
