Ball cock assembly

摘要

A ball cock assembly (10) mounted to a water supply pipe (12) in a fill tank includes a valve housing (16) in which is mounted a valve (18) for regulating the flow of water through the ball cock assembly (10). The valve housing (16) includes a central passage (40) having chambers (42, 46) of differing diameters. The chamber (46) is in fluid communication with tank fill tube (22) and back fill tube (24). The valve (18) is generally cylindrical in configuration and includes an upwardly facing first piston surface (76) and a downwardly facing second piston surface (84) upstream of the first piston surface (76). The valve (18) also includes first and second shoulders (78, 80) which seat against valve seats (44, 48) in the central passage (40) of the housing (16). The valve (18) includes an orifice (90) therethrough which communicates fluid through chamber (42) above the first piston surface (76 ). The valve (18) also includes ports (54) which are selectively aligned with the outlets of the valve housing during reciprocation of the valve (18). The valve is biased toward a closed position by a conventional float (20). In operation, a gradual closing of the valve (18) is provided by a differential fluid pressure acting against the first and second piston areas (76, 84).