Poppet valve

Claim 1

FOR USE IN A HIGH PRESSURE POPPET-TYPE VALVE, A VALVE STRUCTURE WHICH COMPRISES A SEATING ELEMENT OF HARD MATERIAL HAVING AN APERTURE AND A SEATING SURFACE HAVING A STRAIGHT LINE OUTWARD PROJECTION SURROUNDING SAID APERTURE, A COMPOSITE MOVABLE VALVE MEMBER SHIFTABLE BY OPPOSED VALVE SEATING AND VALVE OPENING FLUID PRESSURES BETWEEN A SEATING AND AN OPEN POSITION COMPRISING A METALLIC CORE MEMBER HAVING A SEAT ENGAGING PORTION FOR ENGAGEMENT WITH A PORTION OF SAID SURFACE ADJACENT SAID APERTURE, AND A STEM PORTION, AND A VALVE CLOSING COMPONENT OF SAID MOVABLE VALVE MEMBER OVERLYING SAID METALLIC CORE MEMBER COMPOSED OF A PLASTIC MATERIAL HAVING SUITABLE QUALITIES OF STRENGTH, DUCTILITY, AND PLASTIC FLOW, SAID VALVE CLOSING PLASTIC COMPONENT HAVING A SEATING SURFACE ENGAGING PORTION FORMING AN OUTWARD EXTENSION OF SAID CORE MEMBER SEATING SURFACE ENGAGING PORTION AND SUBSTANTIALLY FLUSH THEREWITH FOR EFFECTING A SIMULTANEOUS ENGAGEMENT OF SAID SEATING SURFACE ENGAGING PORTIONS WITH SAID SEATING ELEMENT ALONG SAID STRAIGHT LINE PROJECTION OF SAID SEATING SURFACE, AND SAID VALVE CLOSING PLASTIC COMPONENT HAVING A CENTRALLY DISPOSED UPWARDLY EXTENDING BORE OPEN AT ITS LOWER END TO RECEIVE SAID STEM PORTION OF SAID CORE MEMBER AND OF A DIAMETER TO PROVIDE A LEAK-TIGHT FIT WITH SAID STEM AND EXTENDING LONGITUDINALLY IN EXCESS OF THE LENGTH OF SAID STEM TO PROVIDE AN UNSUPPORTED AREA OF SAID VALVE CLOSING COMPONENT EQUAL TO THE CROSS-SECTIONAL AREA OF SAID STEM, WHEREBY, THE EFFECTIVE PRESSURE EXERTED BY THE SEATING PORTION OF SAID VALVE CLOSING PLASTIC COMPONENT AGAINST SAID SEATING ELEMENT SEATING SURFACE IS SUBSTANTIALLY INTENSIFIED TO PRODUCE A STRONG INITIAL SEAL BETWEEN SAID VALVE CLOSING PLASTIC COMPONENT AND SAID SEATING ELEMENT SEATING SURFACE, SAID VALVE STRUCTURE FURTHER DEFINING A MEANS BIASING SAID COMPOSITE MOVABLE VALVE MEMBER IN A DIRECTION TO CLOSE SAID VALVE.