High pressure valve

Claim 1

IN A VALVE STRUCTURE SUITABLE FOR HIGH FLUID PRESSURES, THE COMBINATION OF A VALVE CASING HAVING INLET AND OUTLET PASSAGES WITH A COMMUNICATING SUBSTANTIALLY CYLINDRICAL VALVE CHAMBER THEREBETWEEN, THE VALVE CHAMBER BEING DEFINED FOR PREDETERMINED AXIALLY SPACED APART PORTIONS OF ITS LENGTH BY UPPER AND LOWER ANNULAR TAPERED SURFACES AND AN AXIALLY ALIGNED THREADED PORTION BETWEEN SAID LATTER SURFACES, A BODY SEAT HAVING A THICKENED HEAD PORTION RECEIVED IN AN UPPER PORTION OF SAID VALVE CHAMBER IN A PLANE BELOW THE SAID INLET PASSAGE, THE SAID BODY SEAT HEAD PORTION HAVING ITS OUTER PERIPHERY DEFINED BY A FRUSTO-CONICAL SURFACE FOR FLUID-SEALING ENGAGEMENT OF SAID UPPER ANNULAR TAPERED SURFACE OF THE VALVE CHAMBER, STEM AND CLOSURE MEMBER INSERTABLE AXIALLY THROUGH A LOWER ENLARGED OPENING IN SAID CASING VALVE CHAMBER AND BEING MOVABLE AXIALLY PREDETERMINATELY TO MAKE FLUID SEALING CONTACT WITH SAID BODY SEAT, THE SAID BODY SEAT HAVING A CENTRAL CHAMBER FORMING AN ANNULAR DEPENDING WALL THEREON AND CLOSED AT A LOWER END OF SAID CHAMBER, THE LATTER WALL FOR A PORTION THEREOF BEING TRANSVERSELY PORTED IN A PLANE ABOVE SAID CLOSED END OF THE CHAMBER, A SUBSTANTIALLY TUBULAR RETAINING NUT FOR SAID BODY SEAT, A SEAL RING INTERPOSED BETWEEN AN ANNULAR TAPERED SURFACE OF SAID BODY SEAT AND THE UPPER ONE OF SAID ANNULAR TAPERED SURFACES OF THE SAID VALVE CHAMBER, THE SAID RETAINING NUT ENGAGING SAID AXIALLY ALIGNED THREADED PORTION OF SAID CYLINDRICAL VALVE CHAMBER AND HAVING A TRANSVERSELY PORTED WALL PORTION COMMUNICATING WITH THE PORTED WALL PORTION OF THE SAID BODY SEAT AND THE SAID CENTRAL CHAMBER THEREOF, SAID RETAINING NUT RECEIVING SAID DEPENDING WALL PORTION OF SAID BODY SEAT FOR A SUBSTANTIAL PORTION OF THE LENGTH OF SAID WALL PORTION, A BODY SEAL PLUG HAVING A HEAD PORTION RECEIVED SLIDABLY WITHIN A LOWER ENLARGED PORTION OF THE SAID VALVE CHAMBER OF THE CASING, THE SAID PLUG HEAD PORTION HAVING AN ANNULAR TAPERED SURFACE DEFINING THE LOWER PERIPHERAL LIMIT OF SAID HEAD PORTION, AN UPPER PERIPHERAL LIMIT OF SAID PLUG HEAD PORTION BEING DEFINED BY A FRUSTO-CONICAL SURFACE FOR FLUID SEALING ENGAGEMENT WITH SAID LOWER ANNULAR TAPERED SURFACE OF THE VALVE CHAMBER, A SECOND SEAL RING INTERPOSED BETWEEN THE LOWER ONE OF SAID ANNULAR TAPERED SURFACES OF SAID VALVE CHAMBER AND THE SAID PLUG HEAD ANNULAR TAPERED SURFACE AT SAID LOWER PERIPHERAL LIMIT THEREOF, AND MEANS FOR RETAINING SAID SECOND SEAL RING IN FLUID SEALING POSITION AGAINST SAID ANNULAR TAPERED SURFACE DEFINING THE LOWER PERIPHERAL LIMIT OF THE PLUG HEAD PORTION AND SAID LOWER ONE OF SAID VALVE CHAMBER ANNULAR TAPERED SURFACES.