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China Orbital Hydraulic Motor manufacturers Hydraulic Pump Motor 聽 Introduction 聽 Hydraulic pumps work by transferring rotary power into an area of changing volume. As the volume increases, atmospheric pressure acting on top of the fluid in the reservoir pushes the fluid into the new space. The pump should not suck the fluid as this is likely to result in damaging cavitation or aeration. Once the full volume has been reached then timing grooves or ports of the pump, open to allow an area of decreasing volume to push the fluid out into the hydraulic system. The system will set the pressure by the load, not the pump, but each pump type will be capable of operating at a different maximum pressure. 聽 Hydraulic motors work in the reverse direction to pumps e.g. pressurised fluid acts against the motor pistons or gears and drives the shaft rotation. Often pumps and motors use identical parts except for the timing slots / port plates and additional case drain line. The case drain line is required to stop high internal pressure exceeding the limit of the shaft seal. In practice some designs are more suited to pumps and others more suited to motors. All pumps work by transferring rotary power into an area of changing volume.  China Orbital Hydraulic Motor manufacturers website:http://www.yikde.com/orbital-hydraulic-motor/