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1, pumping sand pump has not been running for a long time, so that the impeller, sealing parts bonding, causing the motor to plug the switch;
2, pumping sand pump itself defects, when it appears dead point, this event should be dissolved to inspect the sand pump parts for damage, and timely replacement of damaged parts.
3, electrical failure, check the motor and line there is no fault, the protection system has the correct action, to ensure the power system frequency to normal after the test machine.
No pressure may be the following:
1, the pipeline is leaking pressure, may be a part of the pipeline leakage caused by reducing pressure, thereby reducing the system pressure; can shut down the suction pump outlet valves, check the pressure situation.
2, lack of water, the pipeline of water shortage is also one of the reasons for pressure, many is due to the sand suction pump construction environment There is garbage or weed blockage pipeline imports, at this time after the boot can hear the pump noise is very large, gradually shut down the export valve this sound will gradually decrease. Cleaning up the suction sand pump filter on the net and improve the water level.
3, impeller corrosion or the impeller ring wear, replace the impeller pump.