Measuring and testing – With fluid pressure – Leakage
Patent
1984-08-29
1985-12-17
Swisher, S. Clement
Measuring and testing
With fluid pressure
Leakage
251263, 25112914, 137901, G01M 320, F16K 3106
Patent
active
045585873
ABSTRACT:
In a system for leak detection having many valves, it is desirable to have high vacuum valves operated by solenoids at opposite ends of a diffusion pump in order to isolate the diffusion pump during powr failure or during an intentional shutdown. A valve having a hard spherical ball fitting a vacuum seal and having a spring means to bias the ball in a closed position will close during a power failure. A bell-shaped actuator connected to a solenoid can be used to open the valve with built-in mechanical advantage. A circuit means can be used to supply high starting voltage to the solenoid and then lower voltage to hold the valve open.
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Worthington, New Developments in Trapless Leak Detection, Vacuum Technology Research/Development, 1976.
Cole Stanley Z.
Swisher S. Clement
Varian Associates Inc.
Warsh Kenneth L.
Williams Hezron E.
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