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The Sealing Performance of New Gasketless Flanges Made by Unplasticized Polyvinyl Chloride

机译:未增塑聚氯乙烯制成的新型无垫片法兰的密封性能

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摘要

This paper deals with a new seal system between flange joints without using gasket. This gasketless flange includes a groove and an annular lip that is machined in one of the flange being in contact with the other flange to form a seal line when the flanges are assembled. In this study, first, fundamental dimensions are examined for PVC-U to obtain the best sealing performance. Then, the effects of material difference and flange nominal size on the sealing performance of new gasketless flange are investigated for two types of materials, 0.25% carbon steel (S25C JIS) and unplasticized polyvinyl chloride (PVC-U JIS). It is found that the critical internal pressure where leakage appears is mainly controlled by the maximum normal stress at the annular lip for each material even if the flange nominal sizes are different. The gasketless flange made by PVC-U shows the higher critical internal pressure compared with the case of S25C if the same clamping forces are applied. The effect of stress relaxation for PVC-U on the sealing performance is also considered. Then, it may be concluded that this PVC-U gasketless flange also has good sealing performance.
机译:本文讨论了不使用垫圈的法兰接头之间的新密封系统。该无垫圈凸缘包括凹槽和环形唇,当凸缘被组装时,该环形唇被加工在一个凸缘中与另一个凸缘接触以形成密封线。在这项研究中,首先要检查PVC-U的基本尺寸,以获得最佳的密封性能。然后,研究了材料差异和法兰公称尺寸对新型无垫片法兰密封性能的影响,这两种材料是0.25%碳钢(S25C JIS)和未塑化聚氯乙烯(PVC-U JIS)。已经发现,即使法兰的公称尺寸不同,出现泄漏的临界内部压力也主要受每种材料在环形唇上的最大法向应力控制。如果施加相同的夹紧力,与S25C相比,PVC-U制成的无垫片法兰显示出更高的临界内部压力。还考虑了PVC-U的应力松弛对密封性能的影响。因此,可以得出结论,该PVC-U无垫片法兰也具有良好的密封性能。

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