We Jacktech Hydraulics are dealing in Yuken Hydralic Pump which is of good quality also the price range is too good range,
A variable displacement pump is a device that converts mechanical energy to hydraulic (fluid) energy. The displacement, or amount of fluid pumped per revolution of the pump's input shaft can be varied while the pump is running.
Because the inner and outer rotors have different rotating axes, more space is created on the suction side due to the rotating motion. The oil is drawn in and transported to the pressure side. On the pressure side, the space between the teeth becomes smaller again, and oil is forced into the oil circuit.