Hydraulic transmission and speed and direction control valve therefor

Claim 1

A VALVE FOR CONTROLLING THE DIRECTION AND VOLUMETRIC RATE OF FLOW OF FLUID THROUGH A HYDRAULIC MOTOR FROM A PRESSURE SOURCE OF THE TYPE HAVING HYDRAULICALLY OPERATED MEANS FOR ADJUSTING ITS VOLUMETRIC OUTPUT, SAID VALVE COMPRISING: A VALVE BODY; A DIRECTION CHAMBER FORMED IN SAID VALVE BODY; AN INLET PORT, AND OUTLET CHAMBER AND A PAIR OF MOTOR PORTS FORMED IN SAID VALVE BODY AND COMMUNICATING WITH SAID DIRECTION CHAMBER; MOVABLE DIRECTION CONTROLLING MEANS POSITIONED IN SAID DIRECTION CHAMBER FOR SELECTIVELY INTERCONNECTING EITHER OF SAID MOTOR PORTS TO SAID INLET PORT AND THE OTHER OF SAID MOTOR PORTS TO SAID OUTLET CHAMBER WHEREBY THE DIRECTION OF FLUID FLOW THROUGH SAID MOTOR IS SELECTIVELY REVERSIBLE; A FLOW RATE CHAMBER FORMED IN SAID VALVE BODY AND IN SERIES WITH THE FLUID OPERATING SAID MOTOR; ADJUSTABLE FLOW RATE CONTROLLING MEANS POSITIONED IN SAID FLOW RATE CHAMBER FOR SELECTIVELY RESTRICTING THE FLOW PATH OF THE FLUID OPERATING SAID MOTOR; MEANS FOR HYDRAULICALLY CONNECTING SAID FLOW RATE CONTROLLING MEANS TO SAID PRESSURE SOURCE ADJUSTING MEANS, SAID CONNECTING MEANS BEING RESPONSIVE TO A PRESSURE DIFFERENTIAL ACROSS THE FLOW RATE CONTROLLING MEANS FOR CAUSING ADJUSTMENT OF THE VOLUMETRIC OUTPUT OF SAID PRWSSURE SOURCE TO MAINTAIN SAID PRESSURE DIFFERENTIAL CONSTANT; AND MEANS WITHIN SAID BODY MECHANICALLY INTERCONNECTING SAID DIRECTION CONTROLLING MEANS AND SAID FLOW RATE CONTROLLING MEANS FOR COORDINATING CONTROL OF THE DIRECTION OF FLOW THROUGH SAID MOTOR AND THE VOLUMETRIC RATE OF SAID FLOW.