Ring plate valve unit for stationary air compressors

Claim 1

A VALVE UNIT OF THE CHARACTER DESCRIBED INCLUDING COMPLEMENTARY KEEPER AND SEAT MEMBERS BOLTED TOGETHER TO DEFINE A HOUSING FOR THE UNIT, A PAIR OF CONCENTRICALLY ARRANGED RING PLATE VALVES MOVABLE TO AND FROM SEATED CONDITION RELATIVE TO ARCUATE PORT SLOTS OF THE SEAT MEMBER, A PLURALITY OF CIRCUMFERENTIALLY AND EQUALLY SPACED ANNULAR SPRING MEANS DISPOSED BETWEEN THE KEEPER MEMBER AND THE VALVES, EACH SPRING MEANS BEING CENTERED BELOW THE VALVES IN COMMON RELATION TO BOTH VALVES AND YIELDABLY EXERTING EQUAL SEATING PRESSURE UPON BOTH VALVES, AND A SEPARATING CYLINDRICAL PIN OF UNIFORM DIAMETER REMOVABLY SEATED IN PART IN THE KEEPER AND SEAT MEMBERS PASSING CLOSELY AND AXIALLY THROUGH EACH SPRING MEANS AND FURTHER PASSING BETWEEN BOTH VALVES IN BEARING RELATION THERETO, THE PIN BEING RELEASABLY RESTRAINED AGAINST ROTATION RELATIVE TO THE VALVES.