Piston cap with center vent

摘要

A flushometer having a cap with a substantially central exhaust passage adapted to remove air from the control chamber. The exhaust passage provides for communication between an upper pressure chamber and an interior piston chamber wherein during a flush cycle a portion of the contents of the upper pressure chamber is evacuated through the exhaust passage into the interior piston chamber and ultimately through the outlet of the flushometer.

主权项

1. An flush valve system comprising:
a hollow valve body having an inlet, an outlet, and a valve seat therebetween; a piston assembly movable within the hollow valve body and configured to seat upon the valve seat to seal the inlet from the outlet; an upper pressure chamber positioned above the piston assembly within the hollow valve body; the piston assembly including a piston, having a piston interior chamber, and a cap; the cap including a body portion having a sidewall and a lip extending annularly from the sidewall, the cap further including an upper annular protrusion from the body defining a recess in the body between the sidewall and the upper annular protrusion and further defining an exhaust passage therethrough the lip and the body providing communication between the upper pressure chamber and the piston interior chamber, the exhaust passage being positioned substantially in the center of the cap; the exhaust passage having an upper pressure chamber opening and a piston interior chamber opening wherein the upper pressure chamber opening is larger than the piston interior chamber opening.