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Water ring vacuum pump is a vane with a vane eccentric mounted in the water pump casing, the impeller in the pump casing rotating water ring, its role is equivalent to a piston, relying on changing the volume of the vacuum evacuation of the vacuum pump. Thus, the water ring vacuum pump is pumping gas, rather than liquid. If the water ring pump as a mechanical transport liquid will result in the water ring pump cavity liquid can not be removed in a timely manner caused by excessive pressure pump chamber caused by motor overload, motor phase loss, exhaust obstruction and impeller drag and other part. If in the process of actual use, it is necessary to remove the water vapor and water through the water ring pump, then a pre-separator needs to be arranged between the water ring pump and the heat exchanger to separate the gas and water and then reach the vacuum negative pressure pumping pumping the goal of. Therefore, the water ring vacuum pump can not be used alone to pump water.