Pressure responsive valve

Claim 1

A GOVERNOR SYSTEM COMPRISING A MOVABLE SPEED CONTROL MEMBER, A SPEED RESPONSIVE VACUUM PUMP FOR DEVELOPING A VACUUM IN PROPORTION TO THE SPEED TO BE GOVERNED, A UNITARY DEVICE COMPRISING A HOUSING, A SUBSTANTIALLY RIGID BARRIER EXTENDING TRANSVERSELY ACROSS THE INTERIOR OF SAID HOUSING, A VALVE PORT EXTENDING THROUGH SAID RIGID BARRIER, A FIRST MOVABLE WALL IN SAID HOUSING SPACED SUBSTANTIALLY FROM SAID BARRIER AND DEFINING WITH A PORTION OF SAID HOUSING AND WITH ONE SIDE OF SAID RIGID BARRIER AN EXPANSIBLE WORK CHAMBER, MEANS CONNECTING SAID FIRST MOVABLE WALL TO SAID SPEED CONTROL MEMBER, FIRST RESILIENT MEANS OPERATIVELY CONNECTED TO SAID FIRST MOVABLE WALL FOR BIASING SAID FIRST MOVABLE WALL IN A DIRECTION TO CLOSE SAID SPEED CONTROL MEMBER, A SECOND MOVABLE WALL IN SAID HOUSING ON THE OTHER SIDE OF SAID RIGID BARRIER AND SPACED SUBSTANTIALLY FROM SAID BARRIER, SAID SECOND MOVABLE WALL DIVIDING SAID HOUSING ON SAID OTHER SIDE OF SAID BARRIER INTO AN EXPANSIBLE VALVE CHAMBER AND AN EXPANSIBLE CONTROL CHAMBER, SAID VALVE CHAMBER BEING LOCATED ADJACENT TO SAID RIGID BARRIER AND IN FLUID COMMUNICATION WITH SAID WORK CHAMBER THROUGH SAID VALVE PORT, A RESTRICTED PASSAGE IN THE WALL OF SAID HOUSING CONNECTING SAID VALVE CHAMBER TO ATMOSPHERE, A TAPERED VALVE IN SAID VALVE PORT, MEANS CONNECTING SAID TAPERED VALVE TO SAID SECOND MOVABLE WALL FOR CONTROLLING THE RATE OF FLUID COMMUNICATION BETWEEN SAID WORK AND VALVE CHAMBERS, SAID VALVE WHEN OPENED