Glossary U The Mc Nally Institute 1986 S. Belcher Rd. Unbalanced seal Not hydraulically balanced to generate low heat at the seal faces. Typical of original equipment designs. Filled carbons contain inorganics that will be sensitive to some chemicals and temperature extremes.
Unfilled carbons are the prefereed seal faces.
U.S.C.S. United States Customary System. Al dimensions are in inch units.