The plastic extrusion industry is an important part of plastic product production, and the pressure calibration pump has crucial application value in it. In the screw extrusion system of a plastic extruder, the plasticization and transportation of materials depend on precise pressure control. The pressure calibration pump can calibrate the pressure measurement and control system of the extruder, ensuring that the plastic raw materials are uniformly plasticized under the appropriate pressure and temperature conditions under the rotation of the screw and are extruded from the die head at a stable pressure, forming plastic profiles with uniform quality and precise dimensions, such as plastic pipes and profiles. In the plastic blow molding process, the air pressure inside the blow mold needs to be precisely controlled. The pressure calibration pump can calibrate the pressure devices in the blow molding equipment, ensuring that the plastic parison is subjected to a uniform and appropriate air pressure during the blow molding process, making the wall thickness of the blow molded product uniform and the shape regular, improving the product qualification rate and quality stability, meeting the diverse and high-performance requirements of plastic products in many industries such as construction, packaging, and automobiles, and promoting the efficient and precise production of the plastic extrusion industry.