Lubricated valve with means to relieve

Claim 1

A VALVE, COMPRISING A VALVE BODY HAVING A FLOWWAY THERETHROUGH AND A CHAMBER THEREIN INTERSECTING THE FLOWWAY, A VALVE MEMBER IN THE CHAMBER, MEANS FOR MOVING THE VALVE MEMBER BETWEEN OPENED AND CLOSED POSITIONS, AN ANNULAR SEAT SLIDABLY MOUNTED IN THE FLOWWAY FOR ENGAGEMENT AT ITS INNER END WITH THE VALVE MEMBER, A FIRST SEAL RING CARRIED BY ONE OF THE BODY AND SEAT TO SEAL THEREBETWEEN, A SECOND SEAL RING CARRIED BY ONE OF THE BODY AND SEAT TO SEAL THEREBETWEEN AT A LOCATION MORE DISTANT FROM THE INNER END OF THE SEAT THAN SAID FIRST SEAL RING, A SEALANT INJECTION PORT IN THE VALVE BODY CONNECTING WITH THE FLOWWAY INTERMEDIATE THE SEAL RINGS, A PASSAGEWAY THROUGH THE SEAT CONNECTING THE OUTER SIDE THEREOF INTERMEDIATE SAID SEAL RINGS AND THE INNER END THEREOF, SAID SEAL RINGS PROVIDING A SEAL BETWEEN THE SEAT AND BODY ALONG SUBSTANTIALLY EQUAL DIAMETER PORTIONS OF THE SEAT SO THAT, UPON INJECTION OF SEALANT, THE FORCE ON THE SEAT DUE TO SEALANT PRESSURE INTERMEDIATE SAID SEAL RINGS IS BALANCED IN AN AXIAL DIRECTION, AND AN ANNULAR GROOVE CONNECTING WITH SAID PASSAGEWAY BETWEEN SAID INNER END OF THE SEAT AND VALVE MEMBER TO RECEIVE SEALANT FOR SEALING BETWEEN SAID SEAT AND VALVE MEMBER AND TO RELIEVE SAID SEALANT WHEN THE SAID SEALANT PRESSURE EXCEEDS THE LINE FLUID PRESSURE WITHIN SAID FLOWWAY ON THE SAME SIDE OF THE VALVE MEMBER AS SAID SEAT A PREDETERMINED VALUE.