A variety of hydraulic pumps and motors are using the "sealed volume (chamber)" cyclical changes to work. Working in both the need for auxiliary devices such as valve plate hydraulic pump (import agent), and that "sealed volume" is divided into two separate parts high and low pressure areas. Both at work will produce the phenomenon of trapped oil and radial forces unbalanced hydraulic pump (import service) phone, hydraulic shocks, flow pulsation and fluid leaks and some common physical phenomena. Hydraulic motors generally require inversion, so the internal structure should have symmetry, but the hydraulic pump is generally rotated in one direction, do not have this requirement. In order to reduce oil absorption resistance, reducing the radial force, general pump suction port is larger than the size of the oil port. Low pressure and the pressure of the hydraulic motor is slightly higher than the atmospheric pressure chamber, so there is no above-mentioned requirements. Hydraulic motor requirements can work in a wide speed range, therefore, should be used hydraulic bearings or hydrostatic bearings. When the motor speed is low because the hydraulic pump (import finishing), the use of hydrodynamic bearings, it is not easy to form a lubricating synovial. Vane pump with rotor blades together rely on high-speed rotation of the centrifugal force generated by the inner surface of the stator blade is always snapped, and from seal oil, the formation of the working volume. If its use as a motor, blade root must be spring loaded hydraulic motor pump, in order to ensure the inner surface of the stator blade is always snapped to the normal starter motor. Pump in the structure need to ensure self-priming capability, but it is not required for the hydraulic motor. Hydraulic motor must have a large starting torque. So-called starting torque, the motor is activated by a stationary state, the torque of the motor can output shaft, the torque is normally greater than the torque running state is in the same working pressure, therefore, in order to make the starting torque as close to the operating condition torque requirement of the motor torque ripple is small, a small internal friction. Hydraulic pump (import maintenance) _ hydraulic pump _ from Jinan Jing Jing Chong Chong Hydraulic Machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) strong, credible, in Jinan, Shandong mining machinery industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement to create innovative ideas will lead crystal hydraulic and you hand into the brilliant, for a better future!