Patent ID: 6945336

Claim:
In a rotation motor system including a rotation motor having first and second ports, first and second media lines respectively operably coupled with the first and second ports for receipt and discharge of pressurized media by the motor for operation thereof, and a first, pressure-responsive control system operably coupled with the motor, the improvement, which comprises a second, pressure-independent control system, comprising: a valve interposed between the first and second media lines and shiftable between a closed position wherein the first and second media lines are substantially isolated from one another and a pressure differential exists between the first and second media lines, and an open position wherein the first and second media lines are in communication with one another and the pressure differential between the first and second lines is reduced as compared with the pressure differential when the valve is in the closed position; and a manually controlled control mechanism coupled with the valve and operable to shift the valve from the closed to the open position independently of the pressure-responsive operation of the first control system and of the pressure differential between the first and second media lines.