Pressure balanced valve having yieldable seating

Claim 1

A VALVE FOR CONTROLLING THE FLOW OF PRESSURE FLUIDS THERETHROUGH COMPRISING IN COMBINATION, A HOUSING HAVING A FLOW PASSAGE FORMEE THEREIN, INLET MEANS IN FLUID FLOW COMMYNICATION WITH SAID FLOW PASSAGE FOR THE INTRODUCTION OF PRESSURE FLUID THERETO, EXPANDABLE CHAMBER MEANS IN SAID FLOW PASSAGE IN FLUID FLOW COMMUNICATION WITH SAID INLET MEANS, SAID EXPANDABLE CHAMBER MEANS BEING ADAPTED TO BE CONNECTED TO CONTROLLER MEANS TO CONTROL THE EXPANSION THERETO AND COMPRISING OPPOSITELY ORIENTED SIGNAL AND BALANCING PORTIONS, RESPECTIVELY, OF SUBSTANTIALLY EQUAL OUTWARD AREAS WHEREBY THE FORCES EXERTED THEREON BY SAID PRESSURE FLUID WITHIN SAID FLOW PASSAGE WILL BE SUBSTANTIALLY EQUAL AND BALANCED, PARTITION MEANS EXTENDING ACROSS SAID FLOW PASSAGE AND INCLUDING PORT MEANS FORMED THEREIN IN FLUID FLOW COMMUNICATION WITH SAID FLOW PASSAGE, SAID PORT MEANS HAVING VALVE SEAT MEANS FORMED THEREON, OUTLET MEANS IN FLUID FLOW COMMUNICATION WITH SAID PORT MEANS FOR THE FLOW OF PRESSURE FLUID FROM SAID HOUSING, VALVE MEANS OF THE FREELY FLOATING TYPE COOPERATIVELY ASSOCIATED WITH SAID PORT MEANS AND MOVABLE RELATIVE TO SAID VALVE SEAT MEANS TO PREVENT OR PERMIT FLUID FLOW BETWEEN SAID PORT MEANS AND SAID FLOW PASSAGE, VALVE OPERATING MEANS COOPERATIVELY ASSOCIATED WITH SAID VALVE MEANS AND ONE OF SAID EXPANDABLE CHAMBER PORTIONS AND OPERABLE TO MOVE SAID VALVE MEANS RELATIVE TO SAID VALVE SEAT MEANS, SAID SIGNAL AND BALANCING PORTIONS BEING DISPOSED TO OPPOSITE SIDES OF SAID PARTITION MEANS, AND CONNECTING MEANS EXTENDING THROUGH SAID PARTITION MEANS, WITH CLEARANCE THEREBETWEEN, AT LOCATIONS OFFSET FROM SAID PORT MEANS, FOR CONNECTING SAID SIGNAL AND BALANCING PORTIONS TO TRANSMIT MOTION THREBETWEEN WHEREBY, PRESSURE FLUID INTRODUCED TO SAID FLOW PASSAGE THROUGH SAID INLET MEANS WILL EXERT SUBSTANTIALLY EQUAL AND OPPOSITELY DIRECTED FORCES ON SAID EXPANDABLE CHAMBER PORTIONS AND SAID VALVE MEANS MAY BE MOVED RELATIVE TO SAID VALVE SEAT MEANS THROUGH THE ACTION OF SAID CONTROLLER MEANS.