Effects of a Surface Engineered Metallic Coating on Elastomeric Valve Stem Seal Leakage Page: 61
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Ueda and Fujiwara 1997). Figure 21 shows the test valve installed in the test stand with
the gas supplied from the gas cylinder.
Figure 21. Test valve in test stand.
The test valve bearing housing, gland plate, upper stem seal and stem were
removed prior to each test. Although the upper stem seal can be replaced without
removing the stem, stem removal eased the removal of the upper stem seal that was used
in the prior test. For test trials that were to be performed without lubrication, the gland
plate upper stem seal area was cleaned of any residual lubricant before that test sequence.
The stem and gland plate were reinstalled and the gland plate cap screws were torqued to
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Taylor, John Abner. Effects of a Surface Engineered Metallic Coating on Elastomeric Valve Stem Seal Leakage, thesis, December 2000; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc2690/m1/69/: accessed July 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .