Pressure regulating valve

Claim 1

IN A VALVE, THE COMBINATION OF: A BODY HAVING A CIRCULAR INLET AND A CIRCULAR OUTLET WITH A FLOW PASSAGE THEREBETWEEN AND HAVING A DIAPHRAGM CHAMBER, SAID FLOW PASSAGE INCLUDING A FIRST THROAT SECTION, A VALVE SEAT AND A SECOND THROAT SECTION IN AXIAL ALIGNMENT, WITH SAID THROAT SECTIONS HAVING A TRAPEZODIAL CROSS SECTION WITH THE CENTER OF AREA OF THE TRAPEZODIAL CROSS SECTION OFFSET FROM THE CENTER LINE OF THE CIRCULAR INLET ALONG A LINE PERPENDICULAR TO THE PARALLEL SIDES OF THE TRAPEZODIAL CROSS SECTION AND WITH SAID CIRCULAR OUTLET CHANGING TO THE ADJACENT TRAPEZODIAL THROAT SECTION AT A TRANSITION ZONE, A VALVE MEMBER CARRIED IN SAID BODY DISPOSED BETWEEN SAID THROAT SECTIONS FOR MOVEMENT TOWARD AND AWAY FROM SAID SEAT; A DIAPHRAGM POSITIONED IN SAID CHAMBER DIVIDING SAID CHAMBER INTO TWO ZONES, SAID BODY INCLUDING MEANS PROVIDING A FLOW PATH BETWEEN ONE OF SAID CHAMBER ZONES AND SAID TRANSITION ZONE; AND MEANS FOR CONNECTING SAID DIAPHRAGM TO SAID VALVE MEMBER IN DRIVING RELATION WHEREBY A CHANGE IN PRESSURE DIFFERENTIAL IN SAID ZONES WILL MOVE SAID VALVE MEMBER RELATIVE TO SAID SEAT.