Compressive and sealing characteristics of PTFE under cyclic loading-unloading

Ning Zhang; Qiang Li; Kang Hu; Qing Li

doi:10.1007/s11595-015-1122-9

Journal of Wuhan University of Technology Materials Science Edition ›› 2015, Vol. 30 ›› Issue (1) : 181 -184. DOI: 10.1007/s11595-015-1122-9

Organic Materials

Compressive and sealing characteristics of PTFE under cyclic loading-unloading

Ning Zhang ¹^,²
, Qiang Li ²^,^{^b}
, Kang Hu ¹
, Qing Li ²

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Abstract

Compressive and sealing characteristics of PTFE under cyclic loading-unloading at room temperature are studied in order to evaluate the cyclic sealing performance of control valve comprehensively. The unloading characteristics are different from the loading ones, therefore there is hysteresis between the unloading and loading curves. Compressive hysteresis is the main factor that causes sealing hysteresis. The leakage rate of PTFE complies with the power law before it enters the relatively stable region. Lastly, the effect of working pressure on the compressive and sealing characteristics is discussed. The experimental results show that the working pressure has little effect on compressive deformation but has a great influence on leakage rate.

Keywords

PTFE / compression / sealing / cyclic loading-unloading / working pressure

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Ning Zhang, Qiang Li, Kang Hu, Qing Li. Compressive and sealing characteristics of PTFE under cyclic loading-unloading. Journal of Wuhan University of Technology Materials Science Edition, 2015, 30(1): 181-184 DOI:10.1007/s11595-015-1122-9

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