Shut off valves for high temperature service

Claim 1

A VALVE COMPRISING A BODY HAVING A FLUID PASSAGEWAY THERETHROUGH, A VALVE SEAT IN SAID BODY DISPOSED IN AN INCLINED PLANE ACROSS SAID PASSAGEWAY, A MOVABLE VALVE GATE INCLUDING A MEMBER DEFINING A FACE DISPOSED AT AN ANGLE APPROXIMATING THE ANGLE OF SAID SEAT, MEANS MOUNTING SAID MEMBER FOR ADJUSTIVE MOVEMENTS TO AND FROM SAID SEAT ALONG AN AXIS PARALLEL TO A LINE NORMAL TO SAID SEAT, RESILIENT MEANS ON SAID GATE ADAPTED TO APPLY FORCE TO SAID MEMBER UNIFORMLY ALONG THE FULL EXTENT OF THE PERIMETER OF SAID FACE TO URGE SAID MEMBER ALONG SAID AXIS IN THE DIRECTION OF SAID SEAT, MEANS FOR ACTUATING SAID GATE IN ONE DIRECTION TO CARRY SAID FACE INTO ENGAGEMENT WITH SAID SEAT AND IN THE OPPOSITE DIRECTION TO CARRY SAID FACE AWAY FROM SAID SEAT, SAID FACE IN MOVING TO THE SAID SEAT ENGAGING POSITION INITIALLY CONTACTING SAID SEAT AND IN ITS FURTHER MOVEMENT RUBBING RELATIVE TO SAID SEAT WHILE MOVING ALONG SAID AXIS AGAINST THE URGING FORCE OF SAID RESILIENT MEANS TO FORM A TIGHT SEAL BETWEEN SAID FACE DEFINING MEMBER AND SAID SEAT, AND MEANS INDEPENDENT OF SAID MEMBER ENGAGING SAID RESILIENT MEANS FOR APPLYING A PRELOAD THERETO SUFFICIENT TO MAINTAIN SAID FACE AND SAID SEAT IN SEALING RELATION AGAINST THE FORCES ON SAID MEMBER DUE TO THE FLUID AND THE SEATING OF SAID FACE ON SAID SEAT.