Wearless valve for cryorefrigerator
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United States of America Patent
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Dec 15, 2009
Grant Date -
May 17, 2007
app pub date -
Mar 8, 2005
filing date -
Mar 8, 2004
priority date (Note) -
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Abstract
An improved method of reducing wear dust and torque required to turn a multi-port rotary disc valve utilizes a thrust bearing to hold the valve seat and/or valve disc such that they are not in contact with each other, or have light contact each other.
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