Fluid handling – Control by change of position or inertia of system – By pendulum or swinging member
Patent
1984-01-13
1985-07-30
Nilson, Robert G.
Fluid handling
Control by change of position or inertia of system
By pendulum or swinging member
F16K 1736
Patent
active
045315337
ABSTRACT:
An apparatus which is provided for closing a fluid valve in response to initial movement, as for example caused by a seismic disturbance, which is removably mountable to existing inline valves, such as gas valves. The apparatus includes a trigger which is responsive to seismic movement, particularly at a resonant frequency, to release a pressurized fluid supply which in turn drives a mechanical actuator to actuate the subject valve through the existing valve coupling. The existing valve coupling is typically a valve stem which must be rotated approximately ninety degrees from an open position to a closed position. The pneumatic drive is sufficiently powerful to actuate valves which are noticeably difficult to actuate manually. The force required to actuate the trigger mechanism is independent of the force required to actuate the valve, in accordance with the invention. In a specific embodiment, the trigger mechanism comprises a weight mounted in an inverted pendular fashion on a coil extension spring which is free to move laterally in all directions in one general plane, the coil extension spring being generally compressed such that lateral movement of the weight results in a limited amount of axial lengthening.
REFERENCES:
patent: 3043321 (1962-07-01), Hewitt
patent: 3791396 (1974-02-01), Nelson
patent: 4185651 (1980-01-01), Paulson
patent: 4314120 (1982-02-01), Sharp
Koso Seismic Gas Shut Off Valve, 3/81.
The California valve.
Coombes Graham E.
Lemoine Austin J.
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