Magnetic coupling:  YAVOZI magnetic coupling is applied to the shaft end seal of each high pressure metering pump. The motor drives the external magnetic rotation and transmits the torsional moment through the space, so that the internal magnetic force on the shaft of the high-pressure metering pump sealed in the isolation sleeve rotates synchronously, and the dynamic sealing and static sealing of the pump shaft is eliminated, thereby realizing the fundamental solution of the polyurethane. Chemical equipment such as high-pressure foaming machines in the production process of liquid raw materials, leakage problems appearing on the pump shaft of the metering pump.