Fluid handling – Control by change of position or inertia of system – With second control
Patent
1977-05-20
1978-09-05
Nilson, Robert G.
Fluid handling
Control by change of position or inertia of system
With second control
13761416, F16K 1736
Patent
active
041112202
ABSTRACT:
For use in an earthquake-prone environment, and especially as a gas valve, there is provided a valve body approximately symmetrical about a longitudinal axis and having a transverse intersecting plug bore through the body. A plug is rotatable in the bore to turn a passage through the plug from a position communicating with inlet and outlet ports into a position out of communication therewith. The plug bore merges with a valve seat in one position of the plug substantially coinciding with a plane forming a boundary of a chamber in the plug and normal to the usually vertical longitudinal axis. In one position of the plug, that plane is also coincident with a table forming part of the chamber boundary. There is a chamber wall upstanding from the table and having a distance from a pedestal upstanding from the table that increases as the wall approaches the plug. Also on the plug is a plug wall that extends around much of the valve seat and is in effect a continuation of the chamber wall. A ball in the chamber in one of its positions rests on the pedestal, but when dislodged therefrom by a shake having a horizontal component is supported on the pedestal rim and against the chamber wall and rolls by gravity down to another position on the valve seat blocking the passage. The ball is restored to the pedestal by a closing rotation of the plug, there being a centering notch in the plug wall to center the ball.
REFERENCES:
patent: 749809 (1904-01-01), Truman
patent: 2585316 (1952-02-01), Hobson
Nilson Robert G.
The Regents of the University of California
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