Pressure regulating valve

Claim 1

IN A PRESSURE REGULATING VALVE, CAUSING MEANS FORMING A GENERALLY CYLINDRICAL CHAMBER, A DIAPHRAGM EXTENDING ACROSS SAID CHAMBER TO DIVIDE THE SAME INTO COAXIAL CHAMBER PORTIONS COMPRISING A VENTED CHAMBER PORTION AND AN OUTLET PRESSURE CHAMBER PORTION, SAID CASING MEANS HAVING AN INLET PRESSURE CHAMBER PORTION AT THE VENTED CHAMBER PORTION SIDE OF SAID DIAPHRAGM BUT SPACED AXIALLY THEREFROM AWAY FROM SAID DIAPHRAGM, SAID CASING MEANS HAVING AN AXIAL INLET PASSAGE AT THE INLET PRESSURE CHAMBER SIDE THEREOF IN OPEN FLUID COMMUNICATION WITH SAID INLET PRESSURE CHAMBER, SAID CASING MEANS INCLUDING AN AXIAL BEARING FORMATION SEPARATING SAID INLET PRESSURE CHAMBER PORTION AND SAID VENTED CHAMBER PORTION, A TUBULAR MEMBER AXIALLY SLIDABLE IN SAID BEARING FORMATION AND FIXED AT ONE END TO SAID DIAPHRAGM, THE OPPOSITE END OF SAID TUBULAR MEMBER BEING DISPOSED IN SAID INLET PRESSURE CHAMBER PORTION AND COMPRISING AN AXIALLY MOVABLE VALVE, A RADIAL FACE IN SAID INLET PRESSURE CHAMBER PORTION COOPERATING WITH SAID TUBULAR MEMBER TO FORM A VALVE BETWEEN SAID INLET PRESSURE CHAMBER PORTION AND SAID OUTLET PRESSURE CHAMBER PORTION BY WAY OF THE INTERIOR OF SAID TUBULAR MEMBER WHEREIN THE EFFECTIVE VALVE DIAMETER IS SUBSTANTIALLY THE SAME AS THE DIAMETER OF SAID VALVE IN SAID BEARING FORMATION WHEREBY PRESSURE IN SAID INLET PRESSURE CHAMBER IMPOSES SUBSTANTIALLY NO BIAS ON SAID TUBULAR VALVE MEMBER IN AN AXIAL DIRECTION, A MAIN COMPRESSION COIL SPRING IN SAID VENTED CHAMBER PORTION AND ACTING AGAINST SAID DIAPHRAGM, A MORE YIELDABLE COMPRESSION COIL SPRING OF LESS FORCE THAN SAID MAIN SPRING IN SAID OUTLET PRESSURE CHAMBER PORTION AND HAVING AN END THEREOF ACTING AGAINST SAID DIAPHRAGM TO PARTIALLY COUNTERACT THE BIAS OF SAID MAIN COMPRESSION COIL SPRING, AND AN AXIALLY ADJUSTABLE ANNULAR SPRING SEAT WITHIN SAID OUTLET PRESSURE CHAMBER PORTION BEARING AGAINST THE OTHER END OF SAID MORE YIELDABLE COIL SPRING TO VARY THE COUNTERACTING EFFECT THEREOF WITH RESPECT TO SAID MAIN COMPRESSION COIL SPRING AND THUS ADJUST THE OUTLET PRESSURE CONSTANT OF SAID VALVE, SAID ADJUSTABLE ANNULAR SPRING SEAT HAVING AN AXIAL BORE COMPRISING AN OUTLET PRESSURE PASSAGE.