Hydraulic Pump displacement depends on the bore and stroke of a piston and the number of pistons. A swash plate’s angle determines the stroke, which can vary the hydraulic pump displacement by changing the angle. In a fixed angle’s unit, a swash plate is stationary in the housing. In a variable unit’s, it is mounted on a yoke, which can turn on pintles. Different controls can be attached to the pintles to vary hydraulic pump displacement delivery from zero to the maximum. With certain controls, the direction of flow can be reversed by swinging a yoke past center. In the center position, a swash plate is perpendicular to the cylinder’s, and there is no piston reciprocation; no oil is pumped. Read More

Hydraulic Valves Description: There are nearly as many types of hydraulic valves as there are ways to actuate them. You have solenoid valves, flow control valves and pressure control valves as the three primary groups of valves. Hydraulic Valves open and close, just as other valves, but these are more dynamic, with linear rise and fall of performance, based on the pressure acting upon them. Most pressure valvesare normally closed, meaning that it takes a rise in pressure to open them. However, the pressure-reducing valve is the only one that closes when pressure rises above a set point. Read More