Working principle: the motor slows down through the reducer, the spindle drives the eccentric wheel to rotate, the connecting rod pushes the prefix, and transforms its circular movement into the straight reciprocating motion of the piston. The piston moves reciprocated in the piston cylinder, which drives the diaphragm of the diaphragm chamber through the hydraulic oil of the slurry into the lower inlet check valve, pushed into the diaphragm chamber into the upper chamber, and opened by the upper nitrogen package for high pressure discharge.