Pilot valve control reverse valve

Claim 1

IN COMBINATION WITH A TOOL HAVING CASING, A REVERSIBLE ROTARY MOTOR IN SAID CASING ADAPTED TO BE DRIVEN BY FLUID WITH A PAIR OF FLUID OPENINGS THEREIN, AND SPACED FLUID SUPPLY AND EXHAUST CONDUIT MEANS IN SAID CASING FOR SAID MOTOR, A VALVE COMPRISING A VALVE CASING HAVING A CHAMBER IN COMMUNICATION WITH SAID OPENINGS AND SAID SUPPLY AND EXHAUST CONDUIT MEANS, A VALVE MEMBER SLIDABLE IN SAID CHAMBER AND OPERABLE TO CONTROL FLOW THROUGH SAID MOTOR OPENINGS TO SELECTIVELY CONTROL THE DIRECTION OF ROTATION OF SAID MOTOR, SPRING MEANS IN SAID CHAMBER TO BIAS THE VALVE MEMBER INTO A FIRST POSITION TO ASSOCIATE THE SUPPLY CONDUIT MEANS WITH ONE OF SAID OPENINGS AND THE OTHER OF SAID OPENINGS WITH THE EXHAUST CONDUIT MEANS, SAID VALVE MEMBER HAVING A PAIR OF INTER-CONNECTED SURFACES IN SAID CHAMBER, AND VALVE EXHAUST MEANS ADAPTED TO LOWER THE PRESSURE FORCES ACTING ON ONE OF SAID SURFACES TO OVERCOME THE FORCE OF SAID SPRING MEANS TO MOVE THE VALVE MEMBER INTO A SECOND POSITION TO REVERSELY ASSOCIATE SAID OPENINGS WITH SAID SUPPLY AND EXHAUST CONDUIT MEANS.