Push-pull valve

Claim 1

IN A MIXING VALVE ASSEMBLY, INCLUDING IN COMBINATION: (A) A CYLINDRICAL VALVE HOUSING WITH A MAIN ELONGATED AXIAL BORE HAVING A DISCHARGE OUTLET NEAR THE BOTTOM THEREOF AND TWO OPPOSED WATER INLETS, ONE FOR COLD AND ONE FOR HOT WATER, ABOVE SAID DISCHARGE OUTLET, SAID BORE HAVING A VERTICAL STUD PERMANENTLY MOUNTED IN THE BOTTOM WALL THEREOF, (B) A SEALING MEANS RETAINING SHELL HAVING AN OPEN LOWER END AND A CLOSED UPPER END, SAID UPPER END HAVING A CENTRAL OPENING WITH A SEALING MEANS THEREIN, SAID SHELL HAVING TWO OPPOSED INLET PORTS TO REGISTER WITH SAID WATER INLETS IN SAID HOUSING, EACH OF SAID WATER INLET PORTS HAVING A SEALING MEANS THEREIN, AN INLET SEAL SLEEVE WITHIN EACH INLET PORT COMPRISING A FLATTENED FACE PORTION AND A SKIRT PORTION RAISED THEREFROM TO RETAIN THE SEALING MEANS WITHIN THE INLET PORTS, SAID FLATTENED PORTION CONTACTING AN INNER SEALING RING, A GROOVE ABOVE SAID INLET PORTS HAVING A SEALING MEANS ON THE EXTERIOR SURFACE OF SAID SHELL, A GROOVE ON THE EXTERIOR SURFACE OF SAID SHELL BELOW SAID INLET PORTS HAVING A SEALING MEANS THEREIN, AN OUTLET SLOT BELOW SAID SECOND SEALING MEANS REGISTERING WITH THE OUTLET IN SAID HOUSING, ALL OF THE SEALING MEANS ON THE EXTERIOR SURFACE OF SAID SEALING MEANS RETAINING SHELL CONTACTING THE INNER SURFACE OF THE BORE OF SAID HOUSING, THE SEALING MEANS IN THE PORTS BEING RETAINED IN FIRM CONTACT THEREWITH, (C) A SEALING RING WITHIN SAID SHELL, BEING RETAINED IN WATER-TIGHT ENGAGEMENT THEREWITH, SAID RING HAVING A SERIES OF OPENINGS THEREIN ON THE LOWER PORTION THEREOF, SAID SEALING RING BEING MOUNTED ON A STEM BY MEANS OF A SPIDER, SAID STEM BEING MOUNTED IN THE CENTRAL OPENING IN THE UPPER END OF SAID SHELL, SAID STEM HAVING AN ENLARGED LOWER PORTION AND HAVING THE SAME EXTERNAL DIAMETER AT THE UPPER PORTION OF SAID STEM AS SAID STUD MOUNTED IN THE BOTTOM OF SAID HOUSING, SAID STEM HAVING A CENTRAL BORE THERETHROUGH AND HAVING A VENT NEAR THE TOP THEREOF, SAID ENLARGED PORTION OF SAID STEM HAVING AN AXIAL BORE THEREIN TO RECEIVE SAID STUD AND HAVING A SEALING MEANS MOUNTED IN THE LOWER PORTION THEREOF TO MAINTAIN SAID BORE IN WATERTIGHT ENGAGEMENT WITH SAID STUD, SAID SEALING RING AND SAID STEM BEING CAPABLE OF ROTATION AND LONGITUDINAL MOVEMENT WITHIN SAID SHELL, AND WHEREBY THE UPPER PORTION OF SAID RING WILL SEAL BOTH OF SAID INLET PORTS AND THE LOWER PORTION HAVING SAID OPENINGS THEREIN WHICH MAY BE BROUGHT INTO ENGAGEMENT WITH EITHER OR BOTH OF SAID PORTS TO ADMIT HOT WATER OR COLD WATER OR BOTH IN A CONSTANT VOLUME.