Earthquake safety valve

Details Earthquake safety valve Earthquake safety valve

1990-04-26

1990-10-02

Nilson, Robert G.

Fluid handling

Control by change of position or inertia of system

With second control

137460, 251 65, F16K 1736

Patent

active

049601466

ABSTRACT:
A vibration sensitive safety valve for gaseous fluids using a sphere of ferrous material as a valve plug, the ball being held in a sensitive condition, suspended above a complementary valve seat, by a permanent magnet. The magnetic attraction is such that a significant tremor will dislodge the ball, allowing it to drop and plug the valve passage. A flat non-magnetic spacer disc on the bottom of the magnet allows some lateral movement of the valve ball in response to harmless vibrations, without releasing the ball to close off the valve. A moveable mass within the ball absorbs the effect of minor vibrations.

REFERENCES:
patent: 3783887 (1974-01-01), Shoji
patent: 4640303 (1987-02-01), Greenberg
patent: 4785842 (1988-11-01), Johnson
patent: 4799505 (1989-01-01), Nowell
patent: 4883081 (1989-11-01), Morris

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