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Volume 5, Issue 4-1, July 2016, Page: 43-58
Xu's Sealing Theory and Rectangular & O-Shaped Ring Seals
Xu Changxiang, Zhejiang China Valve Co. Ltd., Wenzhou, Zhejiang, 325024, China
Received: Jun. 22, 2016;       Accepted: Jun. 25, 2016;       Published: Aug. 24, 2016
DOI: 10.11648/j.ijepe.s.2016050401.16      View  7020      Downloads  263
Abstract
The difficulty for a sealing element to create and maintain a leak-free joint is determined by its sealing difficulty factor m1, m1 = elastic modulus Ec of its sealing contact layer/elastic modulus Es of its sealing contact layer substrate. Therefore, theoretically the contact layer of a sealing element shall be soft & inelastic and assembled up to its fully yielded deformation to provide a contact layer with a lower value of active elastic modulus Ec, and the contact layer substrate shall be strong & elastic and assembled up to its fully elastic deformation to provide a contact layer substrate with a higher value of active elastic modulus Es. It is the most difficult for a rubber sealing element to create a leak-free joint because its EcEs, and it is far easier for a metal sealing element than for a rubber sealing element because the metal sealing element can be designed and coated to ensure that assembling can cause its Ec < Es.
Keywords
Seal, Categorization of seals, Circle-based system of O-ring seals, Minimum necessary sealing stress y, Sealing difficulty factor m1, Leak-free maintenance factor m2, Self-sealing mechanism for material (Mechanism of self-sealing Poisson's deformation caused by fluid pressure), Self-sealing mechanism for O-rings (Mechanism of self-sealing deformation caused by fluid seepage)
To cite this article
Xu Changxiang, Xu's Sealing Theory and Rectangular & O-Shaped Ring Seals, International Journal of Energy and Power Engineering. Special Issue: Xu’s Sealing and Flowing Theories of Fluids. Vol. 5, No. 4-1, 2016, pp. 43-58. doi: 10.11648/j.ijepe.s.2016050401.16
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