Liquid helium topping-up apparatus
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United States of America Patent
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Mar 8, 1994
Grant Date -
N/A
app pub date -
Oct 8, 1992
filing date -
Feb 5, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To ensure that only liquid helium is delivered to a cryostat dureing liquid helium refill, the arrangement automatically diverts hot gas which is produced during cooling of the transfer tube, away from the cryostat. The arrangement comprises a three way valve which is operated by pressure variations as a result of cooling part of an enclosed volume of helium gas to a temperature near the normal boiling point of the liquid at atmospheric pressure. The arrangement provides the advantage in that the transfer of helium to a cryostat now becomes very much a less skilled operation.
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