On-off sprinkler

Details On-off sprinkler On-off sprinkler

1975-09-03

1977-03-22

Ward, Jr., Robert S.

Fire extinguishers

Sprinkler heads

239 75, 239569, 137457, 169 60, A62C 3708

Patent

active

RE0291552

ABSTRACT:
An improved sprinkler for a fire protection sprinkler system in which the sprinkler opens to discharge water at one temperature and closes to stop the flow of water at a lower temperature. A pilot valve is actuated by a bimetal disc which also resiliently biases the pilot valve in a closed position. The bimetal disc has a snap action resulting in better control of the "on" and "off" temperatures of the sprinkler. A thermal delay for closing is obtained by the hysteresis which is designed into the bimetal disc.

REFERENCES:
patent: 917292 (1909-04-01), Hankee et al.
patent: 1241209 (1917-09-01), Grinnell
patent: 1826088 (1931-10-01), Ostlind
patent: 1913035 (1933-06-01), Loepsinger
patent: 2101338 (1937-12-01), Lovekin
patent: 2230179 (1941-01-01), Cid
patent: 2647017 (1953-07-01), Coulliette
patent: 3698483 (1972-10-01), Martin et al.

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