High pressure valve having soft seating and balanced seal

Claim 1

A HIGH PRESSURE CONTROL VALVE, COMPRISING: (A) A VALVE BODY HAVING A GENERALLY CYLINDRICAL WALL DEFINING A CENTRAL VALVE CHAMBER WITH A SEAT-RECEIVING BOTTOM SURFACE, AND AT LEAST TWO ORIFICES OPENING INTO SAID VALVE CHAMBER, A FIRST ORIFICE OPENING GENERALLY COAXIALLY INTO SAID VALVE CHAMBER THROUGH SAID BOTTOM SURFACE AND A SECOND ORIFICE OPENING INTO SAID VALVE CHAMBER ABOVE SAID BOTTOM SURFACE THROUGH SAID VALVE WALL; (B) A BARREL MEMBER DETACHABLY RECEIVED IN THE UPPER PORTION OF THE CHAMBER, SAID BARREL HAVING A CHAMBER CENTRALLY DISPOSED THEREIN DEFINING A CLOSURE CHAMBER FOR RECEIVING A VALVE CLOSURE MEMBER; (C) A VALVE CLOSURE MEMBER DISPOSED IN SAID CLOSURE CHAM BER FOR RECIPROCATING MOVEMENT THEREIN, AND INCLUDING A CONTROL CHAMBER AND SAID BARREL, THEREFROM THROUGH SAID CLOSURE CHAMBER AND SAID BARREL, THE LOWER END OF SAID CLOSURE MEMBER HAVING A DEPENDING ANNULAR CLOSURE WALL MEANS WITH A SEAT-ENGAGING SURFACE AT THE LOWER END THEREOF AND ALSO HAVING AND UPWARDLY RECESSED ANNULAR CAVITY AROUND THE INSIDE OF SAID CLOSURE WALL, THE LOWER END OF SAID CLOSURE MEMBER ALSO HAVING A DEPENDING METERING PIN PORTION; (D) ANNULAR, GENERALLY UPSTANDING FLEXIBLE BY-PASS MEANS LOCATED ON SAID BOTTOM SURFACE AND BEING SURROUNDED ON ITS OUTSIDE DIAMETER BY A PLASTIC SEAT MEANS EXTENDING BETWEEN THE BY-PASS AND VALVE CHAMBER WALL SO THAT THE BY-PASS HAS LIMITED LATERAL MOVEMENT, SAID BY-PASS MEANS BEING ADAPTED TO BE CONTACTED BY SAID METERING PIN PORTION IN SUCH A WAY THAT TRAVEL OF SAID CLOSURE MEMBER IS NOT OBSTRUCTED BY CONTACT OF SAID BY-PASS AND SAID METERING PIN PORTION; AND (E) SAID ANNULAR CLOSURE WALL BEING OF SUFFICIENT DIAMETER TO ENGAGE SAID PLASTIC SEAT SO THAT WHEN SAID VALVE IS CLOSED SAID BY-PASS MEANS IS RECEIVED IN SAID ANNULAR CAVITY IN SUCH A WAY THAT SAID METERING PIN PORTION EXTENDS INTO SAID BY-PASS IN ITS CLOSED POSITION, AND SAID BY-PASS MEANS IS IN SPACED RELATION TO THE DEEPEST PART OF SAID ANNULAR CAVITY.