Fluid handling – Control by change of position or inertia of system – With second control
Patent
1978-07-03
1980-06-17
Nilson, Robert G.
Fluid handling
Control by change of position or inertia of system
With second control
137 78R, 251 65, F16K 1736
Patent
active
042079128
ABSTRACT:
An emergency shut-off valve adaptable in a gas supply pipe to shut off the pipe in the time of emergency such as occurrence of an abnormal vibration or gas leak, comprising a hollow body which is open at its top and covered by a cover member, said cover member having secured to its inside central part an iron core around which is wound a coil connected to an external gas leak detector and adapted to magnetize said iron core upon receiving an electric signal from said detector, an actuator provided in said hollow body and having secured to its top face a permanent magnet whereby said actuator is magnetically attached to said iron core, said permanent magnet being arranged such that its upper side has the same polarity as that which appears at the underside of said iron core when it is magnetized so that said actuator will drop because of repulsion therebetween when said iron core is magnetized, said hollow body also having formed in its side wall a gas feed hole and discharge holes, a push-up lever adapted to raise up said actuator from its dropped position to its uppermost position where it is magnetically attached to said iron core, a magnetic induction element provided to said cover member for induction of magnetic pole appearing at the underside of said iron core when it is magnetized, and a pendant such as a chain suspended from an upper part on the external wall of said hollow body to determine verticality of said hollow body.
REFERENCES:
patent: 2508588 (1950-05-01), Waltman
patent: 3783887 (1974-01-01), Shoji
patent: 4018419 (1977-04-01), Monpetit
patent: 4116209 (1978-09-01), Greer
Nilson Robert G.
Oujevolk George B.
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