Automatic sealed gate valve

Claim 1

IN AN AUTOMATIC LUBRICANT SEALED VALVE, A HOUSING HAVING A CLOSURE CHAMBER THEREIN, AN OPERABLE CLOSURE IN THE CHAMBER HAVING UPSTREAM AND DOWNSTREAM SEALING FACES, ALIGNED FLOW PORTS OPENING INTO SAID CHAMBER, SEAT MEMBERS MOUNTED IN THE INNER ENDS OF SAID FLOW PORTS COOPERATING WITH SAID SEALING FACES, AND AN INDEPENDENT LUBRICANT SEALING SYSTEM FOR EACH OF SAID SEALING FACES, EACH SYSTEM BEING PROVIDED WITH A SEALANT RESERVOIR, A MOVABLE BARRIER THEREIN, PASSAGE MEANS TO CONDUCT SEALANT FROM EACH SAID RESERVOIR SOLELY TO ONE OF SAID SEALING FACES OF SAID CLOSURE, CONDUIT MEANS INDEPENDENT OF SAID CHAMBER COMMUNICATING WITH THE FLOW PORT UPSTREAM OF SAID CLOSURE TO ADMIT UPSTREAM LINE PRESSURE DIRECTLY TO THE UPSTREAM RESERVOIR WHICH IS IN COMMUNICATION WITH THE UPSTREAM SEALING FACE OF SAID CLOSURE AND OPERABLE WHEN THE CLOSURE IS IN THE FLOW PORT-CLOSING POSITION TO FORCE SEALANT FROM SAID UPSTREAM RESERVOIR THROUGH THE UPSTREAM SEALING SYSTEM SOLELY TO THE UPSTREAM FACE OF SAID CLOSURE IN RESPONSE TO A DOMINANT FLUID PRESSURE EXISTING IN THE UPSTREAM FLOW PORT IN RELATION TO THE PRESSURE IN SAID CLOSURE CHAMBER, SAID PASSAGE MEANS INCLUDING A FULL PORT SEALANT GROOVE ABOUT A FLOW PORT BETWEEN THE ADJACENT FACES OF A SEAT MEMBER AND SAID CLOSURE, AND A BRIDGING RECESS DISPOSED BETWEEN SAID FACES TO ESTABLISH COMMUNICATION BETWEEN SAID GROOVE AND SAID RESERVOIR ONLY WHEN SAID CLOSURE IS IN THE PORT-CLOSING POSITION.