Earthquake safety valve shut-off

Details Earthquake safety valve shut-off Earthquake safety valve shut-off

1988-07-26

1989-08-29

Nilson, Robert G.

Fluid handling

Control by change of position or inertia of system

By pendulum or swinging member

F16K 1736

Patent

active

048607800

ABSTRACT:
A vibration activated device is provided for closing a utility gas valve. A control lever on the valve is held in the open position by a latch which fits into a latch groove in the end of the control lever of the valve; a spring is attached to the control lever to pull the valve shut when the latch is released. The shock waves of the earthquake move a pendulum which then moves an activator which then moves a pivot arm which moves a latch located thereon to release the valve control lever. When the valve control lever is released, a spring pulls the end of the valve control lever to turn it to the closed position. The device is designed to operate on a valve located in either a vertical or a horizontal pipeline.

REFERENCES:
patent: 3791396 (1974-02-01), Nelson
patent: 4161183 (1979-07-01), Berry
patent: 4542760 (1985-09-01), Flaviani
patent: 4546660 (1985-10-01), Bujold
patent: 4742839 (1988-05-01), Stock

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