There are usually three types of hydraulic pump constructions within mobile hydraulic applications. These include equipment, piston and vane; nevertheless, there are also clutch pumps, dump pumps and pumps for refuse automobiles such as for Hydraulic Pump china example 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 is certainly taken from what’s called the prime mover (a turning drive) such as the power take-off or directly from the pickup truck engine.
With each hydraulic pump, the pump will be of either a uni-rotational or bi-rotational design. As its name implies, a uni-rotational pump is made to operate 
in one direction of shaft rotation. However, a bi-rotational pump has the capacity to operate in either direction.