Dual sealed automatic lubricant sealed gate valve

Claim 1

AN AUTOMATIC LUBRICANT SEALED GATE VALVE INCLUDING A HOUSING HAVING A GATE CHAMBER THEREIN, UPSTREAM AND DOWNSTREAM FLOW PORTS COMMUNICATING WITH SAID CHAMBER, A GATE MEMBER MOVABLE IN SAID CHAMBER RELATIVE TO THE INNER ENDS OF SAID FLOW PORTS, SEALANT GROOVES DISPOSED ABOUT THE THE UPSTREAM AND DOWNSTREAM FLOW PORTS BETWEEN THE RELATED FLOW PORT ENDS AND ADJACNT GATE FACES, AND MEANS FOR AUTOMATICALLY SEALING BOTH THE UPSTREAM AND DOWNSTREAM SIDES OF THE GATE MEMBER SUBSTANTIALLY SIMULTANEOUSLY, SAID MEANS COMPRISING, A SEPARATE SEALANT RESERVOIR COMMUNICATING WITH EACH OF SAID GROOVES FOR SUPPLYING SEALANT THERETO, A FIRST MOVABLE BARRIER IN EACH RESERVOIR RESPONSIVE TO THE DIFFERENTIAL BETWEEN THE PRESSURE IN THE UPSTREAM FLOW PORT AND THE PRESSURE IN SAID CHAMBER TO DELIVER SEALANT ONLY TO THE UPSTREAM IN SAID CHAMBER AND SEPARATE MOVABLE BARRIER IN EACH RESERVOIR RESPONSIVE TO THE DIFFERENTIAL BETWEEN THE PRESSURE IN SAID CHAMBER AND THE PRESSURE IN THE DOWNSTREAM FLOW PORT TO DELIVER SEALANT ONLY TO THE DOWNSTREAM GROOVE, AND MEANS FOR INTRODUCING SEALANT INTO SAID RESERVOIRS.