| 摘要 |
A mechanical fluid controller incorporates a float assembly which is disposed within an auxiliary reservoir. An outlet of the auxiliary reservoir is coupled to a U-shaped conduit, which is in turn coupled to an inlet of a primary reservoir. At least one one-way check valve is disposed in the U-shaped conduit. The auxiliary reservoir also has an inlet that is coupled to a pressurized fluid source. The fluid level in the auxiliary reservoir is initially set approximately equal to the desired upper level of the fluid in the primary reservoir. As the fluid level in the primary reservoir drops, the auxiliary reservoir "sees" this as a drop in the hydrostatic pressure at the outlet side of the U-shaped tube, and fluid automatically flows through the tube into the primary reservoir. The float assembly senses the drop in the fluid level in the auxiliary reservoir and automatically admits water from the pressurized fluid source to bring the fluid level in the auxiliary reservoir back up to the desired upper level. A drain overflow port of the auxiliary reservoir is disposed below an upper edge of the primary reservoir. In this manner, the controller functions to continuously add fluid to the auxiliary reservoir, as needed, to maintain both reservoirs at an approximate common, desired upper level.
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