Combination check valve and seal

Claim 1

IN A CHECK VALVE AND SEAL FORMING A PERIPHERAL SEAL AND CHECK VALVE BETWEEN TWO MEMBERS, A FIRST OF WHICH MEMBERS HAS A CYLINDRICAL INTERIOR WALL AND A SECOND OF WHICH MEMBERS HAS AN EXTERNAL CYLINDRICAL WALL SPACED RADIALLY INWARDLY OF SAID INTERIOR CYLINDRICAL WALL AND COOPERATING THEREWITH TO FORM A COMPRESSION CHAMBER, SAID SECOND MEMBER HAVING AN ANNULAR GROOVE THEREIN OPENING TOWARD SAID INTERIOR CYLINDRICAL WALL AND HAVING FLOW PASSAGEWAYS LEADING THROUGH SAID GROOVE FROM ONE SIDE OF SAID SECOND MEMBER TO THE OTHER, AND MEANS SEATED IN SAID GROOVE ACCOMMODATING THE FLOW OF FLUID THROUGH SAID PASSAGEWAYS IN ONE DIRECTION AND BLOCKING THE FLOW OF FLUID THROUGH SAID PASSAGEWAYS IN AN OPPOSITE DIRECTION COMPRISING: A SPLIT METALLIC SEALING RING OF LESSER WIDTH THAN THE WIDTH OF SAID GROOVE, SLIDABLY MOUNTED IN SAID GROOVE FOR SEALING ENGAGEMENT WITH SAID INTERIOR CYLINDRICAL WALL AND FOR AXIAL MOVEMENT IN A DIRECTION TO ADMIT FLUID THROUGH SAID PASSAGEWAYS UPON THE CREATION OF A VACUUM WITHIN SAID INTERNAL CYLINDRICAL WALL AND FOR AXIAL MOVEMENT IN AN OPPOSITE DIRECTION TO BLOCK THE FLOW OF FLUID THROUGH SAID PASSAGEWAYS UPON THE CREATION OF PRESSURE ON SAID SEALING RING, THE SPACE BETWEEN THE ADJACENT ENDS OF SAID SPLIT METALLIC SEALING RING FORMING AN AIR BLEED PASSAGEWAY, AND A DOWEL MOUNTED ON SAID SECOND MEMBER AND EXTENDING AXIALLY OF SAID CYLINDRICAL WALLS AND HAVING LOOSE ENGAGEMENT WITH SAID SEALING RING, TO INSURE THE POSITION OF THE GAP BETWEEN THE ADJACENT ENDS OF SAID RING IN THE TOP OF SAID COMPRESSION CHAMBER TO INSURE BLEEDING OF AIR FROM SAID COMPRESSION CHAMBER,