The Structure of Labial-Velar Stops

A hydraulic control system having a plurality of hydraulic motors is provided with a sequencing control means for sequentially controlling or operating the motors from a single selector valve. The selector valve is operative to direct pilot fluid through a sequential controlling valve for pilot operation of separate pilot-operated control valves for the separate motors. The sequential control valve is operative to direct the fluid for operation of one of the control valves first for full operation of the first motor and then for directing pilot fluid to the second valve for operating the second motor. For operating the motors in the reverse direction, the second control valve is operative to control the second motor to its fully retracted position and then the first control valve becomes operative until the first motor is fully retracted.

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