| 摘要 |
A standpipe extending upward from the bottom of a liquid container is provided with external helical square threads. A float fits over the standpipe and has a standpipe-operating rod extending down through the standpipe to a control switch below the container. The switch controls a valve for filling the container with liquid to a predetermined liquid level. The float is provided with a sheet metal nut having inwardly projecting teeth engaging the helical threads for rotating the float as the changing liquid level raises and lowers the float relative to the standpipe.
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