Axial piston pump is the use of the drive shaft parallel to the volume change of the piston reciprocating plunger bore arising in to work. Because plunger, and a circular hole is variable pump parts finishing, can achieve high accuracy when working with a variable pump, so the volumetric efficiency of the high variable pump care, smooth operation, flow uniformity, low noise, stress Training advantages variable pump, but more sensitive to contamination of the hydraulic oil, the structure is more complex, higher cost. Pressure limiting type variable vane pump is a single-acting} {stator pump, the pump along a certain direction for translational motion, work, according to changes in system load by the force balance are located on both sides of the variable stator vane pump piston and spring preload principle, you can change the variable displacement pump and variable displacement pump rotor stator eccentricity, thus changing the variable vane pump flow. Steady flow pump system {} double acting vane pump: the completion of each revolution of the rotor suction, each secondary drain. Double acting vane pump compared with single acting vane pump, the flow uniformity, the basic balance suffered radial hydraulic pressure rotor body. Double acting vane pump is generally quantitative outflow, played the role of steady flow. Asker evaluation study, O (∩_∩) O Thank variable pump maintenance, crystal creating hydraulic (certified), variable pump from Jinan Jing Chong hydraulic machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) Shandong Jinan, mining machinery leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum meet customer needs. In the crystal to create a hydraulic leadership with the staff warmly welcome all inquiries negotiations to create the crystal to create a better future for the hydraulic.