Isolation on/off valve
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United States of America Patent
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-
Nov 10, 1987
Issued Date -
N/A
app pub date -
Dec 10, 1986
filing date -
Feb 4, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Fluid-flow control apparatus is disclosed by which magnetically-positionable elements within a rigid body can be externally manipulated using a controlling source of magnetic flux. The relative attractive forces which bias internal magnetic elements into normally-closed sealing engagement are substantially altered by repositioning the magnetic elements in response to the controlling magnet flux. Complete sealing or isolation against back flow through the valve under conditions of net positive outlet pressure is inhibited by the internal double-acting sealing elements which respond in unified manner to the controlling magnetic flux. Sealing surfaces on the elements are dome shaped to limit the effect of horizontal forces imposed thereon. The elements are biased into floating relation and reduced in dimension to inhibit contact with sidewalls of the valve body.
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