Ultra-low heat leak cryogenic valve
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United States of America Patent
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Oct 27, 1992
Grant Date -
N/A
app pub date -
Jun 6, 1991
filing date -
Jun 6, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A cryogenic valve that uses conventional materials in unusual ways to achieve very low heat leak, excellent strength, pressure or vacuum integrity and modest manufacturing cost. Heat leak rates on the order of 0.5 watt have been obtained in a 1.5 inch valve. Such performance is made possible by the unique structure of the valve stem, of the bonnet extension, and of certain insulative spacers. The valve stem consists of a thin wall tube of wound glass filaments in an epoxy matrix. The bonnet extension consists of a thin wall stainless steel bellows wound with glass fibers in an epoxy matrix. The insulative spacers have a shape that results in a long tortuous conduction path when they are stacked inside the valve stem and in the space between the valve stem and the bonnet extension.
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