High pressure valve construction

Claim 1

A PRESSURE SEAL CLOSURE IN A VALVE CONSTRUCTION, COMPRISING, A VALVE HOUSING INCLUDING A MAIN BODY HAVING A FLUENT MATERIAL FLOWWAY THERETHROUGH AND A BONNET EXTENSION THEREABOVE, A VALVE, A VALVE STEM RECIPROCABLE WITHIN AND RELATIVE TO THE EXTENSION, AN ANNULAR AXIALLY-MOVABLE BONNET WITHIN THE EXTENSION AND HAVING AN INTERNAL SURFACE FOR GUIDING THE VALVE STEM AND AN EXTERNAL SURFACE FOR SLIDINGLY ENGAGING THE EXTENSION, A YOKE HAVING A LOWERMOST DOWNWARDLY-FACING FACE SEATABLE UPON AN UPPERMOST UPWARDLY-FACING FACE OF THE EXTENSION AND AN ANNULAR RADIAL FLANGE EXTENDING INWARDLY OF THE SEAT, INOSCULATING SURFACES OF THE FACES OF THE YOKE AND EXTENSION FORMING AN INTERDIGITATED DIAMETRAL YOKE-EXTENSION INTERLOCK FOR EFFECTING CONCOMITANT TRANSLATIONAL MOVEMENTS OF THE YOKE AND EXTENSION, THE EXTENSION BEING EXTERNALLY THREADED WITH A THREAD OF ONE HAND ADJACENT ITS FACE AND THE YOKE BEING EXTERNALLY THREADED WITH A THREAD OF AN OPPOSITE HAND ADJACENT ITS FACE, AN EXTERNAL DIFFERENTIALLY-THREADED COUPLING MEANS HAVING FLIGHTS OF THREADS LEADING FROM OPPOSITE ENDS AND BEING ENGAGEABLE REPECTIVELY WITH THE THREADS OF THE EXTENSION AND THE YOKE, THE EXTENSION AND BONNET AND YOKE FLANGE DEFINING AN ANNULAR PRESSURE SEAL GASKET CHAMBER AT THEIR JUNCTURE OF OPPOSED RELATIONSHIP, AN ANNULAR PRESSURE SEAL GASKET DISPOSED WITHIN THE CHAMBER, MAKEUP LOADING MEANS TIGHTENABLE DOWN UPON THE YOKE FLANGE FOR PULLING THE BONNET UPWARDLY IN THE DEVELOPMENT OF CONTINUOUS PERIPHERAL CONTACT BETWEEN THE GASKET AND THE BONNET AND EXTENSION UNDER THE GASKETRETAINING INFLUENCE OF THE YOKE FLANGE FOR INITIAL SEALING IN THE ABSENCE OF SUBSTANTIAL APPLIED INTERNAL PRESSURE, THE BONNET BEING UPWARDLY MOVABLE INDEPENDENTLY OF THE MAKEUP LOADING MEANS UNDER THE INFLUENCE OF APPLIED INTERNAL PRESSURE FOR INCREASING THE PRESSURE SEALING ENGAGEMENT WITH OUTWARDLY-DIRECTED LOADING BEING SUSTAINED AND OPPOSED BY THE COUPLING MEANS AND DIAMETRAL INTERLOCK.