Toolless-resetable earthquake triggered gas and fluid cutoff val

Details Toolless-resetable earthquake triggered gas and fluid cutoff val Toolless-resetable earthquake triggered gas and fluid cutoff val

1990-07-16

1991-12-24

Nilson, Robert G.

Fluid handling

Control by change of position or inertia of system

251 65, F16K 1736

Patent

active

050743279

ABSTRACT:
A safety cut-off valve for gasses or fluids delivered to buildings which are severely damaged in earthquakes. The valve consists of a non-magnetic housing enclosing a magnetic valve piece which conjugally matches a non-magnetic valve seat to which communicate inlet and outlet so that when the valve piece occupies the seat the inlet and outlet are isolated. The internal enclosed valve piece is held away from the valve seat by an external permanent magnet which is toppled during earthquake thus releasing the internal valve piece into its seat and so closing the valve. By replacing the external permanent magnet in its correct position and orientation the internal valve piece is again drawn away from the seat opening the valve.

REFERENCES:
patent: 3731670 (1973-05-01), Loe
patent: 4572233 (1986-02-01), Weedon
patent: 4750705 (1988-06-01), Zippe
patent: 4785842 (1988-11-01), Johnson
patent: 4817657 (1989-04-01), Kovacs

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