Automatic safety shutoff valve

Details Automatic safety shutoff valve Automatic safety shutoff valve

1992-07-29

1993-05-11

Nilson, Robert G.

Valves and valve actuation

Permanent or constantly energized magnet actuator

137 38, 13763014, F16K 1736

Patent

active

052094545

ABSTRACT:
A safey shutoff valve for insertion into a gas line or other fluid line, that closes in response to an electrical input pulse or to a seismic disturbance. A pivoted flapper arm is held in the open position by a permanent magnet embedded in it. When the magnetic attractive force is reduced enough, the arm swings down by gravity into the closed position and a primary flapper seal element seals the valve seat. Line pressure keeps it closed. The magnetic holding force may be reduced by means of an opposing electromagnet or by the mechanical displacement of a ferromagnetic ball. The valve is manually reset by turning a reset shaft to raise the flapper arm to the open position. The reset shaft also raises a secondary flapper to uncover a small bypass tube to bleed off any residual line pressure; this bypass is automatically closed when the valve closes. No standby power is required.

REFERENCES:
patent: 791339 (1905-05-01), Gold
patent: 2665714 (1954-01-01), Greenwood
patent: 3422841 (1969-01-01), Farrer
patent: 4207912 (1980-06-01), Ichikawa
patent: 4844113 (1989-07-01), Jones
patent: 5113901 (1992-05-01), Young
patent: 5115829 (1992-05-01), Franzke

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