HERMETIZATION OF VALVE SEALS FOR CRYOGENIC FLUIDS

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Abstract

For units providing flow control for cryogenic fluids and operating under conditions of a significant change in the temperature range from positive to cryogenic and in a two-phase state of the working fluid, the problem of sealing the closure members of the units (valve pairs) becomes urgent.

Joint sealing is ensured by creating contact pressure in the joint through deforming the roughness peaks obtained by surface treatment of the valve pair.

The mechanical properties of the materials of the contacting valve pairs change significantly under the influence of cryogenic temperatures. First of all, the plastic properties are reduced, therefore, the creation of increased contact pressure is required.

The article presents a methodology for evaluation of changes in the microgeometry of contacting surfaces depending on the specific contact pressure. It also allows one to evaluate the conductivity of microgaps in the viscous and molecular regimes of fluid flow through contacting surfaces.

About the authors

Yuri I. Kondrashov

Samara National Research University

Email: kon-urij@yandex.ru

Candidate of Technical Sciences, Department of Automatic Systems of Power Plants

Russian Federation

Elena N. Ermilova

Samara National Research University

Author for correspondence.
Email: ermilova6488@gmail.com

postgraduate student, Department of Automatic Systems of Power Plants

Russian Federation

Anna N. Vidyaskina

Samara National Research University

Email: vidiaskina@gmail.ru

student, Department of Automatic Systems of Power Plants

Russian Federation

References

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  6. Zhuravlev O.A., Sergeev R.N., Ivchenko A.V., Kondrashov Yu.I. Vizualizatsiya struktury potoka gaza pri razuprochnenii klapana. Proc. XII International Scientific and Technical Conference «Optical methods of flow investigation». Moscow: Moscow Power Engineering Institute Publ., 2013. (In Russ.)
  7. Yuri I. Kondrashov, Salimzhan A. Gafurov,Vera A. Salmina. Experimental research of dynamic loading the sealing elements of the valve pair from moving parts pneumatic actuator. The 3rd International Conference «Dynamics and vibroacoustics of machines». Samara: Samara National Research University Publ., 2016. p. 218 (In Russ)
  8. Kondrashov Yu.I., Sergeev R.N. Advanced methods for assessing sealing ability of valve seals. Vestnik of Samara University. Aerospace and Mechanical Engineering. 2017. V. 16, no. 3. P. 155-164. doi: 10.18287/2541-7533- 2017-16-3-155-164
  9. Ryzhov, E.B. Kontaktirovanie tverdyh tel pri staticheskih i dinamicheskih nagruzkah / E.B. Ryzhov, YU.V. Kolesnikov, A.G. Suslov – Kiev: Naukova dumka Publ., 1982. – 172 p.
  10. Ogar, P.M. Issledovanie vliyaniya kontaktnyh davlenij v detalyah uplotnitel'nyh soedinenij na ih germetichnost' : Doct.Diss. – L'vov, 1983. – 220 s.
  11. Sejnov, S.V. Obespechenie osnovnyh pokazatelej kachestva truboprovodnoj armatury klapannogo tipa pri proektirovanii, izgotovlenii i ekspluatacii // All-Union Scientific and Technical Conference «Technological management of tribological characteristics of machine components» – Moscow: Znanie Publ., 1983. – pp. 209-210.
  12. Dyomkin, N.B. Kontaktirovanie sherohovatyh poverhnostej – Moscow: Nauka Publ., 1970. - 227 p.
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Copyright (c) 2020 Юрий Иванович Кондрашов, Елена Николаевна Ермилова, Анна Николаевна Видяскина

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Journal of Dynamics and Vibroacoustics

ISSN 2409-4579 (Online)

Publisher and Founder: Samara National Research University, 34, Moskovskoye shosse, Samara, 443086, Russian Federation.

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