Locked Cylinder Using Pilot Check Valves
A check valve (Fig. 1.9) blocks flow in one direction but allows free flow in the opposite direction. A pilot-operated check valve permits flow in the normally blocked opposite direction when pilot pressure is applied at the pilot pressure port of the valve.
Pilot-operated check valves are used to lock the cylinder, so that its piston cannot be moved by an external force. The cylinder can be extended and retracted by the DCV. If regular check valves are used, the cylinder could not extend or retract. External force acting on the piston rod does not move the piston in either direction thus locking the cylinder.
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