Variable radial piston pump variable displacement pump includes a piston and shaft eccentric eccentric variable pump, including the swash plate type axial piston variable displacement pump and Cline - variable motor speed control loop speed range equal to the pump speed range Rp and motor speed range Rm product types for high-power hydraulic circuit system is particularly suitable for systems with two or more hydraulic pumps and motors can require separate occasions for speed variable pressure piston pump is made variable cylinder and pressure regulator components. Constant pressure pump has not reached before the set pressure regulating valve on the pump, variable pump swash plate angle specializing in the largest variable pump *, the largest displacement pump and a variable displacement pump * constant maintenance, in fact, at this stage constant variable pump quite dosing pumps. After reaching the set pressure regulating valve refinement variable pump * control variable oil into the cylinder, the cylinder push variable displacement swash plate pump decreases. In the constant variable pump system, if there is relief valve, pressure regulator valve on the pump is set to be less than the system relief valve set pressure 0.5-1Mpa. Otherwise pump pressure regulating valve can not reach the set value, it can not care variable variable pump *, Jing Chong 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.