Fluid handling – Freeze condition responsive safety systems – Low temperature responsive drains
Patent
1980-01-16
1981-09-01
Rosenthal, Arnold
Fluid handling
Freeze condition responsive safety systems
Low temperature responsive drains
137 79, 137317, 138 34, 138 35, 237 80, E03B 712
Patent
active
042866138
ABSTRACT:
A gate valve, mounted in a drain pipe connected to a downstream exposed end of a part of a plumbing system subject to occasional freezing, is controlled to open and close by opposed pressures of a spring and a temperature controlled pressure of a refrigerant fluid in an expansible and contractable bellows, the respective pressures being equalized at 33 degrees F. with gate valve closed, the pressure differentials therebetween resulting from temperature changes progressively opening and closing valve at temperatures below 33 degrees F. and closing it and keeping it closed at 33 degrees F. and above, and thereby preventing the plumbing from freezing, by allowing water to flow therethrough at and below freezing.
REFERENCES:
patent: 1268648 (1918-06-01), Van Meter
patent: 1338469 (1920-04-01), Waage et al.
patent: 1554344 (1925-09-01), Haapanen
patent: 1558276 (1925-10-01), Peterson
patent: 1786878 (1930-12-01), Keuren
patent: 3320965 (1967-05-01), Morgan
patent: 3369556 (1968-02-01), Allderdice
patent: 3397711 (1968-08-01), Strange
patent: 3618625 (1971-11-01), Walters
patent: 4066090 (1978-01-01), Nakajima et al.
Lake, Jr. James B.
Rosenthal Arnold
Walton G. L.
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