| 摘要 |
A liquid flow indicator for use in an automatic sprinkler system. The indicator is adapted to be attached to a water line and includes a non-metallic vane retainer or support which is mounted within an opening in the water line. A flexible one-piece plastic vane is pivoted to the retainer and has a generally circular body portion which is disposed transversely within the pipe. If the water line is opened downstream of the indicator, the flow of water within the line will pivot the vane, causing a magnet in the upper end of the vane to move into proximity with a sensor to complete an electrical circuit and generate a signal indicating that the water line has been opened. The retainer is formed with a pair of aligned recesses which are sealed apart by a central wall and the upper head of the vane which contains the magnet, is located in one recess, while the sensor is in the other recess.
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