Clutch and pressure modulator valve

Claim 1

IN A FRICTION DISC POWER TRANSMISSION MECHANISM HAVING A ROTARY DISC MEMBER, A MULTIPLE DISC ASSEMBLY CARRIED BY SAID CARRIER MEMBER, SAID CARRIER MEMBER DEFINING AN ANNULAR CYLINDER AT A RADIALLY OUTWARD LOCATION RELATIVE TO THE AXIS OF ROTATION THEREOF, AN ANNULAR PISTON DISPOSED IN SAID CYLINDER, SAID PISTON AND CYLINDER DEFINING A FLUID PRESSURE CHAMBER, A FLUID PRESSURE SOURCE, PASSAGE STRUCTURE EXTENDING FROM SAID PRESSURE SOURCE AND COMMUNICATING WITH SAID PRESSURE CHAMBER, A VALVE CHAMBER DISPOSED IN AND PARTLY DEFINING SAID PASSAGE STRUCTURE, AN EXHAUST PORT COMMUNICAITING WITH SAID VALVE CHAMBER, AND A VALVE ELEMENT MOVABLY DISPOSED IN SAID VALVE CHAMBER, SAID PASSAGE STRUCTURE INCLUDING PORTIONS EXTENDING FROM SAID PRESSURE SOURCE TO POINTS IN SAID VALVE CHAMBER ON RADIALLY INWARD AND RADIALLY OUTWARD SIDES OF SAID VALVE ELEMENT, SAID EXHAUST PORT BEING LOCATED BETWEEN SAID POINTS, SAID VALVE ELEMENT BEING ACTUATED IN RESPONSE TO CENTRIFUGAL FORCE ADAPTED TO CONTROL THE DEGREE OF COMMUNICATION BETWEEN SAID PRESSURE SOURCE AND SAID PRESSURE CHAMBER AND BETWEEN SAID PRESSURE CHAMBER AND SAID EXHAUST PORT WHEREBY CHANGES IN THE EFFECTIVE PRESSURE SUPPLIED BY SAID PRESSURE SOURCE TO SAID PRESSURE CHAMBER WILL TEND TO COMPENSATE FOR CHANGES IN THE CENTRIFUGAL HEAD IN SAID PRESSURE CHAMBER DUE TO ROTATION OF SAID CARRIER MEMBER.