| 摘要 |
<p>This invention provides a pressure assisted valve for filling toilet cisterns. The valve has a chamber with an inlet and an annular outlet around the inlet. A diaphragm closure member is located over the inlet and outlet with its upper surface exposed to the chamber. Located through the diaphragm is an axially movable pintle and a chamber vent opening from the chamber is closable by an enlarged upper end of the pintle. The pintle is has longitudinal ribs on its outer surface to provide a bleed passage past the diaphragm. The lower end of the pintle is supported in a perforated guide in the inlet which is resiliently biased to close the enlarged end of the pintle against the chamber vent opening. A control spindle extends through the chamber vent opening from the enlarged end of the pintle. A manipulating mechanism acts on the spindle to move the pintle to open the chamber vent opening. The valve makes use of differential surfaces on the diaphragm to control the flow of water from the inlet to the outlet.</p> |
