Multi-way valve unit having particular o-ring valve and seat structure

Claim 1

A COMPRESSOR VALVE FOR A REFRIGERATION SYSTEM COMPRISING, A VALVE BODY DEFINIGN A VALVE CHAMBER HAVING AT LEAST ONE OUTLET PORT AND AT LEAST ONE SERVICE PORT LONGITUDINALLY SPACED FROM SAID OUTLET PORT FOR ATTACHMENT TO SERVICE EQUIPMENT, SAID VALVE BOIDY BEING FORMED IN ONE PIECE AND HAVING AN OPEN END, AN INWARDLY EXTENDING ANNULAR RIB ON THE SURFACE OF SAID VALVE CHAMBER DISPOSED BETWEEN SAID OUTLET AND SAID SERVICE PORT AND FORMING A VALVE SURFACE, A VALVE STEM PROVIDED WITH A THREADED PORTION FOR ENGAGEMENT WITH A THREADED PORTION IN SAID VALVE CHAMBER FOR LONGITUDINAL MOVEMENT OF THE VALVE STEM IN SAID VALVE CHAMBER, AN ANNULAR GROOVE ON SAID VALVE STEM ADJACENT THE INNER END THEREOF, AND AN O-RING SEALING MEMBER MOUNTED IN SAID GROOVE FOR ENGAGEMENT WITH SAID VALVE SURFACE IN ONE POSITION OF SAID VALVE STEM TO CLOSE COMMUNICATION BETWEEN SAID SERVICE PORT AND SAID OUTLET PORT, THE SIDE OF SAID RIB BETWEEN SAID VALVE SURFACE THEREOF AND THE JUNCTURE WITH THE VALVE CHAMBER WALL BEING ROUNDED TO PROVIDE A SMOOTH APPROACH FOR THE O-RING AND RESILIENT COMPRESSION THEREOF FROM AN EXPANDED DIAMETER IN WHICH AT LEAST A PORTION OF ITS PERIPHERY PROJECTING BEYOND SAID VALVE STEM IS ENGAGED BY AT LEAST A PORTION OF THE ROUNDED SAID SIDE OF SAID RIB TO A COMPRESSED DIAMETER AS IT IS MOVED INTO ENGAGEMENT WITH SAID VALVE SURFACE, THE EXPANDED DIAMETER OF THE O-RING BEING LESS THAN THE DIAMETER OF THE VALVE STEM THREADS TO PERMIT ASSEMBLY OF THE PARTS BY INSERTING THE VALVE STEM INTO THE SAID OPEN END OF THE VALVE BODY.