NASA NTRS · 19800000097
Automatic shutoff valve
Abstract
Cellulose-sponge disk absorbs incoming water and expands with enough force to shut valve. When water recedes, valve opens by squeezing sponge dry to its original size. This direct mechanical action is considered more reliable than solenoid valve.
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Hawkins, S. F., Overbey, C. W.. 1980-08-01. Automatic shutoff valve. https://ntrs.nasa.gov/citations/19800000097
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