Two-way relief valve

Claim 1

A TWO-WAY FLUID PRESSURE RELIEF VALVE, COMPRISING A HOLLOW VALVE BODY HAVING A PRESSURE THERETHROUGH, A FIRST, ANNULAR VALVE MEMBER DISPOSED TRANSVERSELY OF, AND RECIPROCABLE LONGITUDINALLY IN, THE PASSAGE, A FIRST, OUTER ANNULAR SEAT, FACING A FIRST END OF THE VALVE BODY, ON A FIRST SIDE OF THE FIRST VALVE MEMBER, MEANS ON THE BODY PROVIDING A SECOND, ANNULAR SEAT LONGITUDINALLY ALIGNED WITH THE FIRST SEAT, FACING THE SECOND, OPPOSITE END OF THE BODY AND PROJECTING INWARDLY OF THE WALL OF THE PASSAGE AND GENERALLY TRANSVERSELY OF SUCH PASSAGE IN POSITION TO BE ABUTTED BY AND SEALINGLY TO COOPERATE WITH THE FIRST SEAT WHEN THE FRIST, ANNULAR VALVE MEMBER IS THRUST IN A FIRST DIRECTION, TOWARD THE FIRST END OF THE BODY, THEREAGAINST, A THIRD, INNER ANNULAR SEAT, CONCENTRIC WITH THE FIRST AND SECOND SEATS, ON THE FIRST SIDE OF THE ANNULAR VALVE MEMBER AND SPACED RADIALLY INWARDLY OF THE SECOND SEAT, A SECOND, DISC-LIKE VALVE MEMBER DISPOSED TRANSVERSELY OF, AND RECIPROCABLE LONGITUDINALLY IN, THE PASSAGE, SAID SECOND VALVE MEMBER HAVING A FOURTH, ANNULAR SEAT ON ITS SECOND SIDE OVERLYING AND CONFRONTING THE THIRD SEAT AND SEALINGLY COOPERATING THEREWITH WHEN THE SECOND VALVE MEMBER IS THRUST AGAINST THE THIRD SEAT IN A SECOND DIRECTION, OPPOSITE TO SAID FIRST DIRECTION AND TOWARD THE SECOND END OF THE BODY, MEANS GUIDING THE FIRST AND SECOND VALVE MEMBER FOR RECIPROCATION IN THE PASSAGE, A CENTRAL STEM AFFIXED TO THE SECOND VALVE MEMBER AND SLIDABLY PROJECTING THROUGH A CENTRAL PASSAGE IN THE MEANS ON THE BODY PROVIDING THE FIRST ANNULAR SEAT AND THROUGH A CENTRAL PASSAGE THROUGH THE FIRST VALVE, MEMBER, AN ABUTMENT MOUNTED