Valve for controlling movement of a fluid power unit

Claim 1

A VALVE FOR USE IN A FLUID SYSTEM FOR CONTROLLING THE ACTUATION OF A FLUID POWERED MOTOR UNIT, COMPRISING, A HOUSING HAVING A BORE THEREIN, MOTOR PORTS COMMUNICATING WITH SAID BORE, INLET AND EXHAUST PORTS COMMUNICATING WITH SAID BORE, SPACED VALVE ASSEMBLIES IN SAID BORE AND ADAPTED TO CONTROL FLUID PRESSURE BETWEEN SAID MOTOR PORTS AND SAID INLET AND EXHAUST PORTS, A FORCE TRANSFER PLUNGER DISPOSED IN SAID BORE IN COACTING RELATION BETWEEN SAID VALVE ASSEMBLIES AND BEING RESPONSIVE TO INLET PRESSURE, FOR OPERATING ONE OF SAID VALVE ASSEMBLIES TO CONTROL FLUID FLOW TO SAID EXHAUST PORT FROM ONE OF SAID MOTOR PORTS, AT LEAST SAID ONE VALVE ASSEMBLY COMPRISING A CYLINDER, A BALANCING PISTON INCLUDING AN OUTWARDLY EXTENDING STEM DISPOSED FOR AXIAL MOVEMENT IN SAID CYLINDER, A POPPET VALVE MEMBER MOUNTED ON SAID STEM FOR AXIAL MOVEMENT RELATIVE TO SAID PISTON MEMBER, THE CONFRONTING SURFACES OF PISTON MEMBER AND VALVE MEMBER BEING ADAPTED FOR EXPOSURE TO THE FLUID PRESSURE AT SAID ONE MOTOR PORT, A SEAT IN SAID BORE ADAPTED TO PROVIDE SEATING MEANS FOR SAID VALVE MEMBER, MEANS URGING SAID VALVE MEMBER AWAY FROM SAID PISTON MEMBER INTO SEATING ENGAGEMENT WITH SAID SEAT, MEANS ON SAID PISTON MEMBER ADAPTED FOR ENGAGEMENT WITH SAID VALVE MEMBYER TO LIMIT MOVEMENT OF THE LATTER AWAY FROM SAID PISTON MEMBER, MEANS URGING SAID PISTON TOWARD SAID FORCE TRANSFER PLUNGER, ABUTMENT MEANS FOR LIMITING THE TRAVEL OF SAID PISTON MEMBER TOWARD SAID PLUNGER, AND MEANS COMMUNICATING THE INTERIOR OF SAID CYLINDER WITH SAID EXHAUSR PORT, THE EFFECTIVE PRESSURE AT SAID VALVE MEMBER EXPOSED TO THE FLUID PRESSURE AT SAID ONE MOTOR PORT BEING SUBSTANTIALLY THE SAME AS THE EFFECTIVE PRESSURE AREA OF SAID PISTON MEMBER EXPOSED TO FLUID PRESSURE AT SAID ONE MOTOR PORT.