There are typically three types of hydraulic pump constructions within mobile hydraulic applications. These Hydraulic Pump china include equipment, piston and vane; however, there are also clutch pumps, dump pumps and pumps for refuse vehicles such as dry valve pumps
The hydraulic pump is the element of the hydraulic system that takes mechanical energy and converts it into fluid energy in the form of oil flow. This mechanical energy can be taken from what’s called the primary mover (a turning force) such as the power 
take-off or directly from the vehicle engine.
With each hydraulic pump, the pump will be of the uni-rotational or bi-rotational design. As its name implies, a uni-rotational pump is made to operate in one direction of shaft rotation. On the other hand, a bi-rotational pump has the capacity to operate in either path.