OpenFOAM is the leading free, open source software for computational fluid dynamics (CFD).4 shows a sectional view of a control block that has a built-in pressure port check valve and anti-cavitation valves. The purpose of the pressure port check valve is to hold the negative load during switching the valve from one position to the other and to prevent possible jerky movement at the load side. They connect the hydraulic lines to the reservoir in order to compensate for possible negative pressure and to avoid building cavitation in the actuator. Therefore, as shown in the figure, two check valves are included in the hydraulic lines to act as anti-cavitation valves. Hydraulic actuators, cylinders, or motors are most likely subject to overrunning load. The only difference is that, in mobile machines, the pressure-relief valves are built inside the control block. 3 also shows two auxiliary pressure-relief valves to protect a hydraulic cylinder in mobile applications. 2 shows how auxiliary pressure-relief valves are used to protect the two sides of a cylinder and a motor, consecutively, in industrial applications.įig. If the actuator is cycled very frequently, the pressure spikes fatigue the actuator and hydraulic lines. Gradually open the pump compensator until the pump pressure is lowered to the required value.Ĭhanging the direction of motion of an actuator, while it is connected to an external load, may result in pressure spikes.
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