| 摘要 |
{PG,1 A water closet of the tank type in which air is entrapped in the tank creating pressure to assist in expelling flushing water to a bowl during the flushing cycle. The flushing cycle is activated by a disc valve and piston connected to a domestic water supply for dislodging a float and valve from a valve seat. The water closet is constructed with a minimum of moving parts by employing a piston for dislodging the float which temporarily cuts off the flow of water to the bowl and utilizes the water pressure for returning the piston to the static position. The system also employs a vacuum breaker assembly having a ball in an angled pipe maintained by gravity against a seat in the flushing water line. The force of the water flowing into the bowl forces the ball from the seat during flushing. The ball returns to the seat by the force of gravity on the completion of flushing, preventing back pressure from any vacuum in the domestic water supply. If back pressure occurs before the ball seats, air is drawn through a vent pipe into the domestic water supply, preventing any siphoning from a bowl.
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