When high operating pressures are required, piston pumps are often used. Piston pumps will typically withstand higher pressures than gear pumps with similar displacements; however, there is a higher initial price associated with piston pumps as well as a lower level of resistance to contamination and increased complexity. This complexity falls to the gear designer and service technician to understand to be able to assure the piston pump is usually working correctly using its additional 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 could be desirable to vary system movement without varying engine rate.
A cylinder prevent containing pistons that move in and out is housed within a piston pump. It’s the motion of these pistons that draw oil from the supply port and then force it through the wall plug. The position of the swash plate, that your slipper end of the piston rides against, determines the distance of the piston’s stroke. As the swash plate remains stationary, the cylinder prevent, encompassing the pistons, rotates with the pump’s insight shaft. The pump displacement is usually then determined by the total volume of the pump’s cylinders. Fixed and variable displacement styles are both available.