Drinking fountain arrangement and control valve therefor

Claim 1

A VALVE, COMPRISING: A VALVE BODY HAVING AN OUTWARDLY OPENING CARTRIDGE RECEIVING CAVITY FORMED BY A GENERALLY CYLINDRICAL SIDE WALL AND A BOTTOM WALL AT THE INNER END OF SAID CAVITY, SAID VALVE BODY ALSO HAVING INLET MEANS, INCLUDING AN INLET OPENING IN SAID BOTTOM WALL; A CARTRIDGE UNIT REMOVABLY MOUNTED WITHIN SAID CAVITY AND CONTAINING A CHAMBER THEREIN, THE INNER END OF SAID CARTRIDGE UNIT HAVING AN INLET PORT ALIGNED WITH SAID VALVE INLET OPENING AND COMMUNICATING WITH SAID CHAMBER; A RESILIENT VALVE SEAT CARRIED BY SAID CARTRIDGE UNIT AND DISPOSED IN CLAMPED ENGAGEMENT BETWEEN SAID INNER END OF SAID CARTRIDGE UNIT AND SAID BOTTOM WALL, SAID VALVE SEAT HAVING AN OPENING IN COMMUNICATION WITH SAID VALVE INLET OPENING AND WITH SAID CARTRIDGE CHAMBER INLET PORT, AND OF SMALLER DIAMETER THAN SAID VALVE INLET OPENING, SAID CARTRIDGE HAVING OUTLET PORT MEANS IN THE INNER END THEREOF, AND SAID VALVE BODY HAVING AN OUTLET OPENING IN SAID BOTTOM WALL SPACED OUTWARDLY FROM SAID RESILIENT VALVE SEAT AND IN COMMUNICATION WITH SAID CARTRIDGE UNIT OUTLET PORT MEANS, SAID CLAMPED RESILIENT VALVE SEAT SEALING SAID VALVE INLET OPENING FROM SAID VALVE OUTLET OPENING; SEALING MEANS SPACED FROM SAID OUTLET OPENING AND SAID OUTLET MEANS, ARRANGED TO PREVENT LEAKAGE BETWEEN SAID CARTRIDGE UNIT AND THE SIDE WALL OF SAID CAVITY; A VALVE STEM CARRIED BY SAID CARTRIDGE UNIT, AND INCLUDING: A STEM PORTION SUPPORTED FOR RECIPROCATION WITHIN SAID CARTRIDGE CHAMBER AND EXTENDING THROUGH SAID VALVE SEAT OPENING, SAID STEM PORTION HAVING A SUBSTANTIALLY SMALLER DIAMETER THAN SAID VALVE SEAT OPENING TO PROVIDE A FLOW PATH THEREBETWEEN; AN ENLARGED HEAD PORTION CARRIED BY SAID STEM PORTION AND DISPOSED ON THE INLET SIDE OF SAID VALVE SEAT, SAID ENLARGED HEAD PORTION BEING ENGAGEABLE WITH SAID VALVE SEAT TO PREVENT FLOW THERETHROUGH; AND MEANS CARRIED BY SAID CARTRIDGE UNIT NORMALLY URGING SAID ENLARGED HEAD PORTION INTO ENGAGEMENT WITH SAID SEAT AND BEING MANUALLY OPERABLE TO ACTUATE SAID VALVE STEM TO MOVE SAID ENLARGED HEAD PORTION OUT OF ENGAGEMENT WITH SAID VALVE SEAT.