Control apparatus

Claim 1

A PRESSURE RESPONSIVE EXHAUST VALVE FOR USE IN CONTROLLING A MAIN VALVE OF THE TYPE HAVING A MAIN CLOSURE MEMBER BIASED TO A CLOSED POSITION, A CONTROL CHAMBER INCLUDING A MOVABLE WALL OPERABLY CONNECTED TO THE MAIN CLOSURE MEMBER AND RESPONSIVE TO PRESSURE IN THE CONTROL CHAMBER TO OPEN THE CLOSURE MEMBER, AND CONTROL VALVE MEANS OPERABLE TO A FIRST POSITION TO CONNECT THE CONTROL CHAMBER TO PRESSURE AT THE INLET OF THE MAIN VALVE TO CAUSE OPENING OF THE MAIN CLOSURE MEMBER, AND OPERABLE TO A SECOND POSITION TO CONNECT THE CONTROL CHAMBER TO THE OUTLET OF THE MAIN VALVE TO CAUSE CLOSURE OF THE MAIN CLOSURE MEMBER, THE EXHAUST VALVE COMPRISING: A BODY HAVING A VOID THEREIN; A PAIR OF SPACED, GENERALLY PARALLEL DIAPHRAGMS DISPOSED IN SAID VOID AND DIVIDING IT INTO AN OPERATING CHAMBER BETWEEN THE FIRST OF SAID DIAPHRAGMS AND SAID BODY AND A TIMING CHAMBER BETWEEN THE SECOND OF SAID DIAPHRAGMS AND SAID BODY, AND A CENTRAL CHAMBER INTERMEDIATE SAID DIAPHRAGMS; FIRST FLUID PASSAGE MEANS INCLUDING A FLOW RESTRICTION AND CONNECTING SAID CENTRAL CHAMBER TO ATMOSPHERE; SECOND FLUID PASSAGE MEANS ADAPTED TO CONNECT SAID OPERATING CHAMBER TO THE OUTLET OF THE MAIN VALVE; THIRD FLUID PASSAGE MEANS ADAPTED TO CONNECT SAID OPERATING CHAMBER TO THE CONTROL CHAMBER; AN EXHAUST VALVE CLOSURE MEANS COOPERABLE WITH SAID THIRD FLUID PASSAGE TO CONTROL FLUID FLOW THERETHROUTH, SAID CLOSURE MEMBER BEING OPERABLY ENGAGED BY SAID FIRST DIAPHRAGM AND NORMALLY URGED THEREBY TO A POSITION TO CLOSE SAID THIRD PASSAGES MEANS, SAID FIRST DIAPHRAGM BEING RESPONSIVE TO FLUID PRESSURE IN SAID OPERATING CHAMBER FOR MOVEMENT TOWARD SAID CENTRAL CHAMBER TO ALLOW SAID CLOSURE MEMBER TO OPEN SAID THIRD PASSAGE MEANS; A PAIR OF SPACED GENERALLY PARALLEL LEVER MEMBER CANTILEVERED ON SAID BODY IN SAID CENTRAL CHAMBER AND EXTENDING GENERALLY PARALLEL TO SAID DIAPHRAGMS, SAID LEVELS HAVING A PAIR OF ALIGNED APERTURES THERETHROUGH, EACH OF SAID LEVERS HAVING A CALIBRATION TAB EXTENDING THEREFROM AT AN ACUTE ANGLE TO SAID LEVERS; A FIRST ADJUSTMENT MEMBER THREADED INTO SAID BODY AND EXTENDING INTO SAID CENTRAL CHAMBER GENERALLY PARALLEL TO SAID LEVERS AND ENGAGING THE CALIBRATION TAB ON THE FIRST OF SAID LEVERS SO THAT SAID ADJUSTMENT MEMBER MAY BE SELECTIVELY MANIPULATED TO DEFLECT SAID FIRST LEVER TOWARD OR AWAY FROM THE SECOND OF SAID LEVERS; A SECOND ADJUSTMENT MEMBER, SIMILAR TO SAID FIRST ADJUSTMENT MEMBER AND ENGAGING THE CALIBRATION TAB ON SAID SECOND LEVER SO THAT SAID SECOND ADJUSTMENT MEMBER MAY BE SELECTIVELY MANIPULATED TO DEFLECT SAID SECOND LEVER TOWARD OR AWAY FROM SAID FIRST LEVER; A GENERALLY CUP-SHAPED MEMBER HAVING AN ANNULAR FLANGE AROUND ITS EXTERIOR, SAID MEMBER BEING ENTRAPPED BETWEEN SAID LEVER MEMBERS WITH THE CLOSED END OF THE CUP EXTENDING THROUGH SAID SECOND LEVER TOWARD SAID SECOND DIAPHRAGM; A FIRST LOADING SPRING DISPOSED BETWEEN SAID CUP-SHAPED MEMBER AND SAID FIRST DIAPHRAGM AND URGING SAID FIRST DIAPHRAGM TO A POSITION TO CLOSE SAID CLOSURE MEMBER WITH RESPECT TO SAID THIRD PASSAGE AND URGING SAID CUP-SHAPED MEMBER TOWARD A POSITION WHEREIN THE FLANGE THEREON ENGAGES SAID SECOND LEVER; A SECOND, SUBSTANTIALLY LIGHTER SPRING INTERMEDIATE SAID CUP-SHAPED MEMBER AND SAID SECOND DIAPHRAGM AND NORMALLY URGING SAID SECOND DIAPHRAGM AWAY FROM THE CUP-