Importance

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Abstract

The present invention is directed to a hydraulically balanced ballcock (10). A unique valve element (60) is translationally slidable within a valve housing (22) provided in the body (11) of the ballcock (10). A washer (74) received on the head (70) of the piston (61) in the valve element (60) moves in and out of engagement with a valve seat (85) presented from the valve housing (22) to effect closure and opening of the ballcock (10). A bore (95) extends through the piston (61) and stem portion (62) of the valve element (60) to communicate with a control chamber (125). Radial orifices (98 to 101) through a nozzle (73) that extends forwardly of the piston head (70) and through the washer (74) are located to communicate the pressure resulting from the venturi effect of fluid flow between the washer (74) and the seat (85) to the control chamber (15) by virtue of the bore (95). A metering pin (120) effects a time delay in the transmission of pressure to the control chamber (125) through bore (95), and the axial orifice (96) in nozzle (73) regulates the degree of the pressure differential. Passageways (75) vent the rear of the washer (74) to retain it in situ without a mechanical means. A support ring (111) is rotatably received on the valve housing (22) to permit tightening of the end cap (114) onto the housing (22) without deleterious effect on a rolling diaphragm (104) secured thereby, and the float (31) and counter weight (26) are uniquely adjustable and are operably connected to the valve element (60) by a relatively short lever (40).

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First Claim