Valve for fluid pressure device

Claim 1

IN A FLUID PRESSURE DEVICE, THE COMBINATION OF A BODY HAVING A CYLINDRICAL INTERNALLY THREADED BORE EXTENDING INWARDLY FROM AN EXTERIOR SURFACE OF THE BODY, A FIRST COUNTERBORE ALINGED AXIALLY WITH AND EXTENDING INWARDLY FROM SAID BORE AND PROVIDING A SMOOTH CYLINDRICAL WALL, A SECOND COUNTERBORE EXTENDING INWARDLY FROM AND ALIGNED AXIALLY WITH SAID FIRST COUNTERBORE AND PROVIDING A SMOOTH CYLINDRICAL INTERNAL WALL, MEANS ON SAID BODY DEFINING A CIRCULAR VALVE SEAT CONCENTRIC WITH SAID SECOND COUNTERBORE AND SPACED FROM SAID FIRST COUNTERBORE, AN ELONGATED CYLINDRICAL VALVE ELEMENT HAVING ONE END PORTION THREADED EXTERNALLY AND ITS OTHER END PORTION OF SMOOTH CYLINDRICAL EXTERNAL CONTOUR TELESCOPING CLOSELY AND GUIDED WITHIN SAID SECOND COUNTERBORE AND EXTENDING FROM SAID VALVE SEAT ALONG AND AXIALLY BEYOND THE REMOTE END OF THE SECOND COUNTERBORE AND INTO SAID FIRST COUNTERBORE, A RING OF RESILIENT SEALING MATERIAL SEATED IN THE BOTTOM OF SAID FIRST COUNTERBORE AND TELESCOPING CLOSELY WITH SAID INTERIOR WALL OF THE FIRST COUNTERBORE AND SAID SMOOTH OTHER END PORTION OF SAID ELEMENT, A HOLLOW CYLINDRICAL PLUG HAVING ONE END PORTION THREADED INTO SAID BORE AND FORMED WITH INTERNAL THREADS RECEIVING SAID THREADED END PORTION OF SAID ELEMENT AND ITS OTHER END PORTION OF REDUCED THICKNESS TELESCOPING CLOSELY WITH SAID SECOND COUNTERBORE WALL AND SAID SMOOTH END PORTION OF SAID VALVE ELEMENT, SAID OTHER END PORTION OF SAID PLUG APPLYING AN AXIAL FORCE TO COMPRESS SAID RESILIENT RING AND FORCE THE SAME RADIALLY INTO SEALING ENGAGEMENT WITH SAID SECOND COUNTERBORE WALL AND SAID SMOOTH END PORTION OF SAID VALVE ELEMENT, A BACK-UP RING INTERPOSED BETWEEN SAID SEALING RING AND SAID PLUG TO TRANSMIT SAID AXIAL COMPRESSION FORCE TO THE SEALING RING, AND SHOULDERS FORMED ON THE INTERIOR OF SAID PLUG AND ON SAID ELEMENT AND FACING AXIALLY TO ENGAGE EACH OTHER AND LIMIT AXIAL MOVEMENT OF THE ELEMENT AWAY FROM SAID SEAT.