Effects of a Surface Engineered Metallic Coating on Elastomeric Valve Stem Seal Leakage Page: 75
View a full description of this thesis.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
CHAPTER 5
CONCLUSION
The purpose of this research was to determine if the application of a metal coated
O-ring using the PlasmaBond process would reduce leakage from an upper O-ring seal
of a 2 inch, pressure class 300, manual ball valve. A further purpose of this research was
to determine if lubrication in conjunction with the metallic coating would reduce stem
leakage.
Analysis of the research data resulted in failure to reject the null hypothesis in all
but one instance. The one instance that the null hypothesis was rejected was for the 50
cycle PlasmaBond test and the results only exceeded the objective criterion by a small
margin. It was concluded, from the analysis, that this research does not support a claim
that there is an improvement in leakage using the PlasmaBond treatment alone or with
lubrication.
The leak rate increased as testing progressed through the test sequences regardless
of the treatment of the samples. It was concluded from this that the increase in leakage
was caused by a variable that was dependent on the number of test cycles. Dynamic
elastomeric seals have the unusual ability to wear harder metal surfaces (Martini 1984).
While there were no visible signs of wear, it was conclude that a wear related mechanism
was probably the cause of the increased leakage. The use of the random test sequence
prevented a wear related variable from inducing an error into the analysis.75
Upcoming Pages
Here’s what’s next.
Search Inside
This thesis can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Thesis.
Taylor, John Abner. Effects of a Surface Engineered Metallic Coating on Elastomeric Valve Stem Seal Leakage, thesis, December 2000; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc2690/m1/83/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .