초록 ▼

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 oper

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.

대표청구항 ▼

A control system for sequential operation of a plurality of hydraulic motors, said system comprising: at least a first and a second hydraulic motor; a source of motive fluid for operation of said hydraulic motors; sequence control means including a first and a second pilot-operated control valve for

A control system for sequential operation of a plurality of hydraulic motors, said system comprising: at least a first and a second hydraulic motor; a source of motive fluid for operation of said hydraulic motors; sequence control means including a first and a second pilot-operated control valve for directing said motive fluid to and from said first and said second hydraulic motors for sequential operation thereof; a source of pilot fluid for shifting said valves; a pilot selector valve for selectively directing pilot fluid for shifting said first and said second control valves; and, said sequence control means further including a sequence control valve intermediate said pilot selector valve and said first and second control valves and responsive in a first position for communicating pilot fluid upon movement of said pilot selector valve in a first direction for shifting said first of said control valves first for extension of said first hydraulic motor, and pilot means responsive to extension of said first motor for shifting said sequence control valve to a second position for communicating pilot fluid for shifting the second of said control valves for operation of said second motor in a first direction after said first motor is extended a predetermined amount activating said pilot means, and said sequence control valve in said second position communicating fluid upon movement of said pilot selector valve in a second direction for communicating fluid for shifting said second of said control valves for retraction of said second motor and means responsive to full retraction of said second motor for shfting said sequence control valve to said first position for actuating said first control valve for retraction of said first motor.