Fluid handling – Control by change of position or inertia of system
Patent
1992-04-28
1993-05-11
Nilson, Robert G.
Fluid handling
Control by change of position or inertia of system
F16K 1736
Patent
active
052092526
ABSTRACT:
A gas shut-off valve is provided for closing off a natural gas pipeline in the event of an earthquake or other seismic disturbance. The valve has an inlet and an outlet aperture communicating with a central chamber, and a valve seat provided between the inlet and the outlet apertures. An annular channel is located above the chamber, and at least one ball rolls along the channel. A guide ramp is provided which allows a ball to leave the channel and fall onto the valve seat during the earthquake, blocking gas flow between the inlet and the outlet apertures. The guide ramp has a concave surface which provides a continuous path for the ball from the channel. The ball has a center of gravity substantially displaced from an initial position over the channel to a second position directly over the valve seat when it has rolled to a crest of the guide ramp under influence of the earthquake. The valve also has a spring biased retraction rod to remove the ball from the valve seat and return it to the channel, and a turbulence screen within the valve chamber to prevent formation of eddy currents within the chamber.
REFERENCES:
patent: 2215044 (1940-09-01), Kammerdiner
patent: 2585316 (1952-02-01), Hobson
patent: 2927532 (1960-03-01), Ferre, Sr.
patent: 3747616 (1973-07-01), Lloyd
patent: 3768497 (1973-10-01), Mueller
patent: 4212313 (1980-07-01), Winters
patent: 4331171 (1982-05-01), Novi
patent: 4485832 (1984-12-01), Plemmons et al.
patent: 4565208 (1986-01-01), Ritchie et al.
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