PST standard centrifugal pump (hereinafter referred to as electric pump) has the advantages of compact structure, small volume, beautiful appearance, small installation area, stable operation, long service life, high efficiency, low power consumption, and convenient decoration. And can be used in series according to the needs of head and flow. This electric pump consists of three parts: an electric motor, a mechanical seal, and a water pump. The motor is a single-phase or three-phase asynchronous motor; The mechanical seal is used between the water pump and the motor, and the rotor shaft of the electric pump is made of high-quality carbon steel material and subjected to anti-corrosion treatment to ensure more reliable mechanical strength, which can effectively improve the wear and corrosion resistance of the shaft. At the same time, it is also convenient for the maintenance and disassembly of the impeller. The fixed end seals of the pump are sealed with “o” shaped rubber sealing rings as static sealing machines.