Dually effective hydraulic valve

Claim 1

A HYDRAULIC SYSTEM, COMPRISING, IN COMBINATION: (A) HYDRAULIC MOTOR MEANS HAVING AN INLET AND AN OUTLET; (B) HYDRAULIC PUMP MEANS HAVING PRESSURE AND RETURN LINES CONNECTED TO SAID INLET AND SAID OUTLET RESPECTIVELY SO AS TO DEFINE A CLOSED FLOW PATH HYDRAULIC SYSTEM; AND (C) VALVE MEANS DISPOSED TO CONTROL FLOW BETWEEN SAID INLET AND OUTLET AND SAID PRESSURE AND RETURN LINES, SAID VALVE MEANS INCLUDING (1) A HOLLOW VALVE BODY HAVING A RECOIL CYLINDER, A CYLINDER CHAMBER ON EACH SIDE OF SAID RECOIL CYLINDER, TWO PUMP CHAMBERS EACH IN COMMUNICATION WITH A CYLINDER CHAMBER AND ONE IN COMMUNICATION WITH SAID PRESSURE LINE AND THE OTHER IN COMMUNICATION WITH SAID RETURN LINE, TWO MOTOR CHAMBERS EACH IN COMMUNICATION WITH A PUMP CHAMBER VIA A VALVE SEAT ALIGNED WITH THE CYLINDER CHAMBER, AND ONE IN COMMUNICATION WITH SAID INLET AND THE OTHER IN COMMUNICATION WITH SAID OUTLET, A RADIAL BORE FORMED THROUGH EACH CYLINDER CHAMBER TO COMMUNICATE SAID CHAMBER WITH THE RESPECTIVE MOTOR CHAMBERS, (2) A RECOIL PISTON DISPOSED IN SAID RECOIL CYLINDER AND HAVING A PISTON ROD EXTENDING FROM EACH END THEREOF, (3) VALVE RODS CONNECTED WITH AND ON EITHER SIDE OF SAID RECOIL PISTON AND PASSING THROUGH SAID CYLINDER CHAMBERS AND SAID PUMP CHAMBERS RESPECTIVELY AND HAVING A VALVE ELEMENT ON THE END THEREOF WHICH IS DISPOSED TO FIT IN SAID VALVE SEAT AND BLOCK COMMUNICATION BETWEEN THE PUMP CHAMBERS AND THE MOTOR CHAMBERS, AND CONNECTED TO BE MOVED OFF THE VALVE SEAT BY SAID PISTON ROD AND VALVE ROD WHEN SAID RECOIL PISTON IS MOVED, (4) A POT-SHAPED HOUSING PORTION DISPOSED WITHIN EACH PUMP CHAMBER AND OPENING TOWARD THE CYLINDER CHAMBER, AND (5) A HOLLOW SLIDE VALVE DISPOSED IN EACH CYLINDER CHAMBER AND HAVING A RADIAL WALL WHICH FORMS TWO INTERNAL SPACES WITHIN EACH VALVE, WITH THE VALVE RODS PASSING THROUGH SAID WALL, AND SAID SLIDE VALVE BEING DISPOSED WITHIN SAID HOUSING PORTION WHEREBY THE SPACE WHICH FACES THE HOUSING PORTION DEFINES A CHAMBER THEREWITH, A BORE FORMED THROUGH SAID VALVE ROD, SAID PISTON ROD, AND SAID PISTON WHEREBY THE CHAMBER FORMED BY THE HOUSING PORTION AND THE SLIDE VALVE ON ONE SIDE OF THE RECOIL PISTON COMMUNICATES WITH THE SPACE ON THE OTHER SIDE OF SAID PISTON, SAID SLIDE VALVE BEING MOUNTED TO NORMALLY BLOCK SAID RADIAL BORE BUT BEING SLIDABLY MOVABLE WHEREBY SAID BORE CAN PROVIDE A SECONDARY PATH OF COMMUNICATION BETWEEN THE MOTOR CHAMBER AND THE PUMP CHAMBER EVEN WHEN SAID VALVE ELEMENT IS YET SEATED IN SAID VALVE SEAT.