Method of forming slide gate valve parts
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United States of America Patent
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-
Aug 19, 1980
Grant Date -
N/A
app pub date -
Mar 6, 1979
filing date -
Mar 6, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Upper and lower plates, as well as other parts, for a slide gate valve are formed by casting into a mold, preferably a metal mold, a castable refractory composition containing from 1 to 5% of a long chain glassy polyphosphate, preferably one having an average chain length of about 20 phosphorous atoms, from 0.1 to 0.5% boric acid, the balance of the castable being sized periclase refractory grain.
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