| 摘要 |
In a casing is a cell filled with predetermined air pressure constantly, one wall of the cell is a rubber diaphragm which is pressed by the air pressure in the cell against a valve stem, the valve on which bears against a second diaphragm for closing the opening of the valve seat of a conduit. The space between the rubber diaphragms is divided by a separator disk. A regulator valve controls the introduction of air pressure to the chamber between the separator disk and the first diaphragm so that when the pressure is increased so as to balance and overcome the action of the constant air pressure above the diaphragm, the water pressure lifts the valve. When the air pressure between the disk and the first diaphragm is again reduced, the constant pressure above the first diaphragm closes the valve.
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