Control spear for use in a passage for conducting dust-containing hot gases
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United States of America Patent
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Sep 29, 1992
Grant Date -
N/A
app pub date -
Oct 9, 1991
filing date -
Nov 16, 1990
priority date (Note) -
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Abstract
A control spear serves to close and to controllably open a valve passage in a passage for conducting a dust-containing gas at temperatures of about 400.degree. to 1200.degree. C. The control spear comprises a shaft and a frustoconical head which cooperates with the valve passage. The shaft is movably mounted on the head and is preferably resiliently biased against the shaft.
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