Ceramic orifice ring
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United States of America Patent
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-
Aug 21, 1990
Grant Date -
N/A
app pub date -
Aug 18, 1989
filing date -
Aug 18, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An orifice ring insert formed of a heat resistant metal such as 50-50 nickel-chrome alloy is dropped into position within the orifice opening in the ceramic orifice ring. The ring is counterbored to receive the flange of the ring with sufficient clearance to permit expansion. A lock nut is threaded to the lower end of the insert. The lock nut has a slope to its upper surface that contacts the bottom of the ceramic orifice ring. This slope takes into consideration the relative thermal expansion rates of the metal insert and ceramic orifice member. The nut stays tight during operation but does not crack the ceramic.
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