Selector valve

Claim 1

A SELECTOR VALVE COMPRISING: TWO BODY MEMBERS; EACH OF SAID MEMBERS HAVING OPPOSED CAVITIES HAVING WALLS WITH RIM PORTIONS; MEANS FOR SECURING SAID BODY MEMBERS TOGETHER WITH THEIR RESPECTIVE CAVITIES CONTIGUOUS IN THE PROVISION OF A CHAMBER; AN INLET PORT FORMED IN EACH BODY MEMBER, EACH INLET CONNECTING WITH SUITABLE POSITIVE PRESSURE LINES HAVING POSITIVE FLUID SOURCES OF RELATIVE LOW AND HIGH PRESSURE; A VENTED OUTLET PORT FORMED IN ONE OF SAID BODY MEMBERS LEADING FROM SAID CHAMBER, SAID INLET PORTS WHEN SAID BODY MEMBERS ARE SECURED TOGETHER BEING IN SPACED ALIGNMENT, THE TERMINUS OF EACH INLET PORT BEING DEFINED BY AN ANNULAR COUNTERSUNK PORTION IN THE PROVISION OF VERTICALLY SPACED VALVE SEATS BELKOW THE RIM OF THE WALLS OF EACH RESPECTIVE OPPOSED BODY CAVITY; AND A PRESSURE RESPONSIVE FLEXIBLE DIAPHRAGM CLAMPED BETWEEN SAID BODY MEMBERS AT A PERIPHERAL PORTION THEREOF EXTENDING BETWEEN SAID OPPOSED CAVITIES AND SAID VERTICALLY SPACED VALVE SEATS, SAID DIAPHRAGM HAVING A CENTRAL VALVE PORTION FOR SELECTIVE SEATING ON SAID VALVE SEATS BY DIFFERENTIAL PRESSURE ACROSS SAID DIAPHRAGM TO CUT OFF THE INLET PORT HAVING THE LOWER PRESSURE, AND A PLURALITY OF OPENINGS FORMED IN SAID DIAPHRAGM ADJACENTLY SPACED WITH RESPECT TO SAID CENTRAL VALVE PORTION RADIALLY OUTWARD OF THE RESPECTIVE VALVE SEATS, SAID OPENINGS PERMITTING DISCHARGE OF CONTROL PRESSURE FROM THE SAID VENTER OUTLET PORT REGARDLESS OF WHICH INLET PORT IS CUT OFF BY SAID VALVE.