| 摘要 |
There is disclosed a liquid level control valve ideally suited for water closets and the like that employs a submersed liquid pressure responsive diaphragm as an actuator for the control valve. The control valve is supported in the tank on a liquid inlet vertical column, above the normal, controlled liquid level thereon. The control valve has a flexible valve closure member that subdivides the control valve housing into main and secondary chambers. A small orifice provides liquid communication through the diaphragm between the chambers and the secondary chamber is provided with a bleed orifice in the housing wall with a closure member therefor carried on an actuator arm which is mechanically coupled through a vent pipe to the diaphragm actuator. Response of the actuator, to liquid pressure causes a downward deflection of the diaphragm which moves the bleed orifice closure member into a closed position, applying the liquid pressure in the secondary chamber onto the flexible inlet valve closure member whereby this member seats and seals the inlet port of the valve. The entire valve structure, as well as the vent pipe from the actuator, communicate to the atmosphere above the liquid level of the tank, thereby insuring a truly antisyphon operation.
|
