Snap-acting and modulating valve

Claim 1

THE COMBINATION COMPRISING A VALVE BODY INCLUDING AN INLET, AN OUTLET AND AN APERTURED WALL THEREBETWEEN; A VALVE SEAT AT THE APERTURE OF SAID WALL; A PRESSURE REGULATOR VALVE POSITIONED IN SAID BODY ON THE INLET SIDE OF SAID APERTURED WALL AND COOPERABLE WITH SAID SEAT TO CONTROL THE FLOW OF FLUID THERETHROUGH; FIRST MEANS ON THE INLET SIDE OF SAID WALL BIASING SAID VALVE TOWARD ITS CLOSED POSITION; SECOND MEANS ON THE OUTLET SIDE OF SAID WALL BIASING SAID VALVE TOWARD ITS OPEN POSITION; PRESSURE RESPONSIVE MEANS IN SAID VALVE ON THE OUTLET SIDE OF SAID APERTURED WALL AND OPERABLY CONNECTED TO SAID VALVE; CONDITION RESPONSIVE MEANS ON THE OUTLET SIDE OF SAID WALL AND HAVING AN ACTUATOR FOR OPERATING SAID VALVE; AND SEPARATE MOTION TRANSMITTING MEANS EXTENDING BETWEEN SAID ACTUATOR AND SAID FIRST AND SECOND MEANS, ONE OF SAID SEPARATE MOTION TRANSMITTING MEANS INCLUDING SNAP-ACTION MEANS ARRANGED TO BE ACTUATED BY SAID ACTUATOR UPON INITIAL MOVEMENT THEREOF IN A VALVE-OPENING DIRECTION TO OVERPOWER SAID FIRST MEANS SO AS TO FREE SAID VALVE TO MOVE TO AN OPEN POSITION UNDER THE BIAS OF SAID SECOND MEANS, AND THE OTHER OF SAID SEPARATE MOTION TRANSMITTING MEANS BEING ARRNAGED TO VARIABLY LOAD SAID SECOND MEANS TO VARY THE PRESSURE AT WHICH SAID VALVE WILL REGULATE.