R cartridge seal design and arrangement

Claim 1

IN COMBINATION IN A VALVE ASSEMBLY COMPRISING A VALVE HOUSING, A CYLINDRICAL SLEEVE MEMBER MOUNTED WITHIN SAID HOUSING, FLUID INLET AND AN OUTLET MEANS PROVIDING FOR FLUID FLOW THROUGH SAID HOUSING AND SLEEVE, SAID SLEEVE HAVING AN ANNULAR GROOVE IN ITS INNER SURFACE AND A PAIR OF SPACED VALVE MEMBERS MOUNTED WITHIN SAID SLEEVE FOR ROTATION AND RECIPROCATION, A SEALING MEMBER MOUNTED IN SAID GROOVE, SAID SEALING MEMBER BEING GENERALLY CYLINDRICAL AND FORMED OF FLEXIBLE MATERIAL, SAID SEALING MEMBER BEING SHAPED TO DEFINE ADJACENT ONE END THEREOF AN INTERNAL RETAINING PORTION OF SUBSTANTIALLY THE SAME DIAMETER AS THE INNER DIAMETER OF SAID SLEEVE AND BEING PROVIDED ADJACENT ITS OTHER END WITH AN INWARDLY DIRECTED FLANGE DEFINING A TERMINAL VALVE SEAT; SAID VALVES BEING SPACED APART SUCH DISTANCE THAT ONLY ONE OF SAID VALVES IS IN POSITION TO COOPERATE WITH SAID SEALING MEMBER AT A TIME, OF SAID VALVES ONE BEING WITHIN SAID RETAINING PORTION IN RETAINING RELATION THEREWITH AND OUT OF CONTACT WITH SAID FLANGE IN ONE POSITION OF VALVE ADJUSTMENT, THE OTHER OF SAID VALVES BEING SEATED AGAINST SAID FLANGE IN ANOTHER POSITION OF ADJUSTMENT AND OUT OF CONTACT WITH RETAINING PORTION.