Seismic valve

Details Seismic valve Seismic valve

1992-12-04

1994-07-05

Nilson, Robert G.

Fluid handling

Control by change of position or inertia of system

With second control

137 45, 137 80, F16K 1736

Patent

active

053258819

ABSTRACT:
A seismic shut off valve includes a cripple column responsive to seismic movement. A toggle spring overlies the cripple column. Latch pins extend from the toggle spring into a valve body to hold a popper valve in an open position. During an earthquake, the cripple column buckles causing the toggle spring to bow upwardly under spring force exerted on the toggle spring through the latch pins from the popper valve. The latch pins release the poppet valve which shifts to seal against a valve seat in a valve body. A ball joint connecting the valve body and cripple column allow the cripple column to be vertically aligned despite use of the valve on a non-vertical pipe.

REFERENCES:
patent: 2853089 (1958-09-01), Bair
patent: 3842852 (1974-10-01), Bair
patent: 4274431 (1981-06-01), Keller

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