When high operating pressures are required, piston pumps are often used. Piston pumps will typically endure higher pressures than gear pumps with comparable displacements; however, there exists a higher initial cost associated with piston pumps in addition to a lower level of resistance to contamination and increased complexity. This complexity falls to the equipment designer and service technician to understand in order to assure the piston pump is certainly working correctly with its extra shifting parts, stricter filtration requirements and closer tolerances. Piston pumps tend to be used with truck-mounted cranes, but are also discovered within other applications such as snow and ice control where it might be desirable to vary system movement without varying engine acceleration.

A cylinder prevent containing pistons that move around in and out is housed within a piston pump. It’s the motion of the pistons that draw essential oil from the supply port and then push it through the store. The position of the swash plate, that your slipper end of the piston rides against, determines the length of the piston’s stroke. As the swash plate remains stationary, the cylinder prevent, encompassing the pistons, rotates with the pump’s input shaft. The pump displacement can be then dependant on the total volume of the pump’s cylinders. Fixed and variable displacement designs are both available.