Valve for shutting off gas flow in pipes during earthquakes

Details Valve for shutting off gas flow in pipes during earthquakes Valve for shutting off gas flow in pipes during earthquakes

1975-07-21

1976-12-07

Nilson, Robert G.

Fluid handling

Control by change of position or inertia of system

251 68, F16K 1736

Patent

active

039956512

ABSTRACT:
An outlet pipe passes through the wall of an inlet pipe and communicates therewith. At the intersection of the two pipes, a flat valve seat is formed. A spring-loaded valve presses down against the valve seat to isolate the two pipes when unlocked, leaving the seat unobstructed and the pipes in communication when in a locked position. A catch normally supports the valve against the pressure of the spring, but pivots out of the way to allow the valve to close against the seat, in response to an electrical signal obtained from a battery placed in series with a mercury switch. A solenoid, actuated by the closing of the switch, moves the catch to its unlocked position.

REFERENCES:
patent: 2333370 (1943-11-01), Graham
patent: 2615461 (1952-10-01), Crow
patent: 2875617 (1959-03-01), Murphy
patent: 3314411 (1967-04-01), Power
patent: 3779262 (1973-12-01), Manning

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