Automatic safety shutoff valve

Details Automatic safety shutoff valve Automatic safety shutoff valve

1997-07-28

2000-09-05

Chambers, A. Michael

Fluid handling

With indicator, register, recorder, alarm or inspection means

Position or extent of motion indicator

137 38, 137559, 251 65, F16K 3700

Patent

active

061127647

ABSTRACT:
A flapper-type gas valve automatically closable by accelerations characteristic of earthquakes. The arm is held up in the "valve open" position by a magnet attracting a soft ferromagnetic armature. The armature can be displaced to release the flapper to close the valve, either by seismic accelerations or manually by novel magnetic means--the latter for testing or for non-seismic emergencies. The latter employ movable permanent magnets or electromagnets. Additional magnets are provided to hold the valve closed. Indicating means on the flapper shaft can be viewed through a window to see the valve status--open or closed. The electromagnetic modification provides remote status indication via a magnetically-actuated switch.

REFERENCES:
patent: 3857277 (1974-12-01), Moore
patent: 4207912 (1980-06-01), Icikawa
patent: 4844113 (1989-07-01), Jones
patent: 5052429 (1991-10-01), Yoo
patent: 5115829 (1992-05-01), Frazke
patent: 5209454 (1993-05-01), Engdahl et al.
patent: 5307699 (1994-05-01), Engdahl et al.

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