Fluid handling – Ambient condition change responsive – Burner gas cutoff
Patent
1990-03-14
1990-12-04
Hepperle, Stephen M.
Fluid handling
Ambient condition change responsive
Burner gas cutoff
137629, 251 65, F16K 1736, F16K 3108
Patent
active
049746243
ABSTRACT:
A gas shut-off device comprising a housing having a gas inflow hole and a gas outflow hole, the housing including therein a first shut-off valve with permanent magnets for closing and opening the gas flow passage, a partition having an opening formed therein for allowing gas to flow little by little from the inflow side into the outflow side, a second shut-off valve with permanent magnets for shutting off the flow of gas through the opening in the partition; and a solenoid having a rotary element being rotatable in forward and reverse directions according to a signal from a gas detector and a signal from a reset service respectively, the rotary element having a first permanent magnet to attract or repel the permanent magnet of the first shut-off valve at each stop position of the rotary element and a second permanent magnet to attract or repel the permanent magnet of the second shut-off valve at each stop position of the rotary element.
REFERENCES:
patent: 2297797 (1942-10-01), Oetiker
patent: 2589188 (1952-03-01), DeCraene et al.
patent: 2729221 (1956-01-01), Gorham et al.
patent: 3134404 (1964-05-01), Ziccardi
patent: 3355140 (1967-11-01), Andersen
patent: 3783887 (1974-01-01), Shoji
patent: 4491142 (1985-01-01), Shimizu
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