| 摘要 |
This hydraulic lock, for preventing escape of working fluid from a motor cylinder, is constructed so that working fluid flows freely to the cylinder for the working stroke of the cylinder, but reverse flow is prevented automatically unless a special flow control valve is operated. A valve assembly includes an actuator and two valve elements, one of which is a check valve that prevents outflow of working fluid from the cylinder; but the check valve permits free inflow to the cylinder. The other valve element has a reference orifice for flow control and a piston controlling the actuation. The second valve element maintains a flow control based on force applied to the actuator and on the pressure drop of working fluid flowing from the cylinder. In the preferred construction, the flow control valve closes against a seat carried by the check valve.
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