Fluid handling – Control by change of position or inertia of system – With second control
Patent
1977-08-04
1979-07-17
Nilson, Robert G.
Fluid handling
Control by change of position or inertia of system
With second control
251 66, F16K 1736
Patent
active
041611837
ABSTRACT:
A vibration sensitive valve operating device capable of being tuned to vibrations of predetermined magnitude, such as earthquake-type vibrations of a magnitude causing serious threshold structural damage, and incorporating a latch assembly and triggerable catch assembly providing great force amplification between the holding force, which is a ball weight received in a balance plate concave depression of predetermined contour, and a large mechanical force, e.g. the force exerted on a spring loaded torque arm coupled to a valve stem. The latch assembly includes one or more rail members carrying first and second bearings and pivotable about an axis parallel to the operational axis of the associated valve, the first bearing being engaged with the free end of the torque arm when the device is latched. The catch assembly includes a trigger arm frictionally coupled to the balance plate for rotation therewith about another axis parallel to the latch and valve axes noted and normally engaged with the second bearing. In response to vibrations of predetermined magnitude or greater, the ball weight is dislodged from the balance plate, releasing the trigger arm for rotation, which permits pivotal motion of the latch rail(s) until the torque arm is released.
REFERENCES:
patent: 1742685 (1930-01-01), Brandon
patent: 2615460 (1952-10-01), Crow
patent: 3791396 (1974-02-01), Nelson
patent: 4007643 (1977-02-01), Matsushita
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