Automatic on-off fire sprinkler head

Details Automatic on-off fire sprinkler head Automatic on-off fire sprinkler head

1980-10-15

1982-11-16

Rolla, Joseph J.

Fire extinguishers

Sprinkler heads

Shut off valve

251 45, A62C 3900

Patent

active

043590985

ABSTRACT:
An automatic on-off sprinkler head including a housing that defines a primary chamber and a pilot chamber enclosed thereby; an inlet orifice and outlet orifice both opening into the primary chamber; a primary valve seat located between the inlet and the outlet orifices; a movable valve closure comprising a flexible diaphragm wall portion separating the primary chamber from the pilot chamber, the valve closure remaining against the valve seat to prevent fluid flow between the inlet and the outlet orifices in response to less than a predetermined differential pressure across the wall portion and movable away from the valve seat to permit fluid flow between the inlet and outlet orifices in response to a differential pressure greater than the predetermined pressure; a fill port providing limited fluid flow between the inlet orifice and the pilot chamber; a release port for discharging fluid from the pilot chamber; and a pilot valve controlling fluid flow through the release port. In response to a fire condition, a sensor moves the normally closed pilot valve into an open position and thereby produces a differential pressure across the wall portion that opens the main valve closure.

REFERENCES:
patent: 3022039 (1962-02-01), Conerod
patent: 3536294 (1970-10-01), Rodiguez
patent: 3749176 (1923-07-01), Gremier
patent: 4132237 (1979-01-01), Kennedy et al.
patent: 4187683 (1980-02-01), Northrop, Jr.

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