| 摘要 |
A fluid powered actuator system has first and second piston actuators, the fluid flows to and from which pass through first and second flow paths which include respective first and second valve devices, the valve devices being coupled for operation in unison and being responsive to the flow levels therethrough, so that the valve devices operate to equalize these flows and thereby to equalize the rates of movement of the piston actuators. A further valve is responsive to a predetermined level of difference between the flows in the first and second paths to apply a servo actuating pressure which urges the first and second valve devices to a position in which flow to or from the piston actuators is prevented.
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