| 摘要 |
A hydraulic control device which uses throttle means preferably a one-way valve with a spring loaded ball to produce a differential pressure signal when pressure medium flows through the device. The pressure signal is used to move a piston which in turn actuates control means, such as a slide extension of the piston rod, to control the flow of pressure medium through control channels. The initiation of a working cycle effected by the flow of pressure medium through the control channels can thus be inhibited until the flow of pressure medium through the device has ceased indicating that a preceding working cycle has been completed.
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