Valve unit for non-lube air compressors

Claim 1

IN A VALVE UNIT FOR A PISTON TYPE AIR COMPRESSOR, COMPRISING A VALVE SEAT MEMBER HAVING AN INNER LEVEL FACE AND A PAIR OF CONCENTRIC AIR INTAKE CHANNELS RECESSED IN SAID FACE, A KEEPER MEMBER COMPLEMENTING THE SEAT MEMBER HAVING AN INNER LEVEL FACE AND HAVING AN ANNULAR CHANNEL RECESSED THEREIN IN OPPOSED PARALLEL RELATION TO THE INTAKE CHANNELS, AND A PAIR OF CONCENTRICALLY ARRANGED RING PLATE VALVES AXIALLY MOVABLE IN THE ANNULAR CHANNEL TO OPEN AND CLOSED CONDITION OVER THE INTAKE CHANNELS, THE IMPROVEMENT COMPRISING: A PLURALITY OF WELLS SPACED CIRCUMFERENTIALLY EQUALLY APART AT THE BOTTOM OF THE ANNULAR CHANNEL OF THE KEEPER MEMBER AND EACH CENTERED RELATIVE TO THE INTAKE CHANNELS, A SEPARATE GUIDE CENTERED AXIAL WITH EACH WELL FORMED IN THE SEAT MEMBER BETWEEN THE INTAKE CHANNELS, A VALVE GUIDE ASSOCIATED WITH EACH WALL HAVING AN ANNULAR BASE PORTION ABUTTING UNDERSURFACE PORTIONS OF BOTH VALVES, A GUIDE STEM PORTION EXTENDING AXIALLY FROM THE BASE PORTON HAVING SLIDABLE MOVEMENT IN THE GUIDE BORE AND EXTENDING BETWEEN THE VALVES AND IN CLOSE RELATION THERETO, A SPRING SEATED IN EACH WELL PRESSING UPWARDLY AGAINST THE UNDERSIDE OF THE BASE PORTION OF THE RELATED GUIDE MEMBER SO AS TO YIELDABLY HOLD THE VALVES BY MEANS OF THE BASE PORTION SEATED OVER THE INTAKE CHANNELS, THE BASE PORTION OF EACH GAUIDE MEMBER BEING FORCEFULLY MOVABLE INTO ITS CORRESPONDING WELL UPON OPENING OF THE VALVES, EACH WELL HAVING A FLAT LEVEL BOTTOM SURFACE, AND THE BASE PORTION OF EACH GUIDE MEMBER HAVING A COMPLEMENTARY FLAT UNDERSURFACE IMPACTABLE AGAINST THE BOTTOM SURFACE OF ITS WELL UPON OPENING OF THE VALVES.