| 摘要 |
A remote-control valve having at least a two-part housing with a pressure inlet and adjacent outlet in one part, and which valve is opened and closed by a flexible continuous impermeable diaphragm at the base of a pressurizable frusto-conical chamber in the other part of the housing. This substantially conical chamber contains a free rubber ball which closes the apex opening from the chamber when the chamber is pressurized through a continuously open bypass from the inlet duct around the diaphragm in the first part of the housing. A projecting means such as a pin insertable through the apex of the chamber moves the ball away from its outlet duct to reduce the pressure in said chamber so that the pressure in the inlet duct will flex the diaphragm to open the valve to the outlet duct. Then when the projecting means or pin is retracted, the pressure from the inlet duct through the bypass will repressurize the chamber by moving the free ball into the apex outlet seat of the chamber, so that pressure will build up in this chamber and move the diaphragm back onto the inlet and outlet ducts to close the valve. The outlet apex duct from the chamber may be connected to the outlet duct in the first part through a second bypass which may be valved to adjust the flow therethrough. The operation of the projecting means may be manual, electrical such as by a solenoid, or mechanical such as by a lever and float when the valve is used to maintain a predetermined level of liquid in a tank, such as a toilet flush tank or a watering trough. A branch duct may be provided from the second bypass for refilling a toilet bowl when the valve is used for maintaining the liquid level in a toilet flush tank.
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