The main parts of the pump are: pump body, pump cover, impeller, shaft, double suction sealing ring, sleeve, etc.The pump body and the cover constitute the working chamber of the impeller, on the inlet and outlet water flange, made of vacuum gauge and pressure gauge installation pipe screw holes.The lower part of the inlet and outlet water flange is provided with a pipe threaded hole for discharging water.The impeller, which has been verified by static balance, is fixed on the shaft with the axle sleeve nuts on both sides of the sleeve, and its axial position can be adjusted by the axle sleeve nut.The pump shaft is supported by two single row radial ball bearings.The bearing is installed inside the bearing and installed at both ends of the pump body, and lubricated with butter.Double suction seal ring to reduce water leakage of pump pressure chamber back to suction chamber.The pump is driven directly by a motor through an elastic coupling. It also use internal combustion engine when necessary.The shaft seal is a soft packing seal, which can adopt mechanical seal structure according to user's requirement.