Comparative Analysis of the Tightness of Two Types of Power Valves

A. V. Koroliov1, P. Y. Pavlyshyn2, V. S. Tayakin2

1Odessa National Polytechnic University, 1, Shevchenko ave, Odesa, 65044, Ukraine
2Rivne Nuclear Power Plant, Varash, 34400, Ukraine



The valve is a responsible and important element of the nuclear power plants’ thermal scheme. It is the valve that overlaps the emergency sections of the circuit, is responsible for regulating the flow or emptying of the vessels. But energy fittings are often the weakest point in the NPP system. It is often determined by an irresponsible attitude to its operation, “guaranteed closure” with the help of available tools, improper installation and prevention. One of the most important moments of valve operation is the force of its closure, which is often determined by the settings of the limit coupling of the electric drive, or by the experience of the worker closing it. In a previous article, a check valve was studied, which showed the importance and timeliness of such studies. The objective of the article is to study the possibility of reducing the closing force of the valve without a significant loss of tightness. Studies were conducted on a stand that allows you to set air pressure up to 3.5 MPa. Processing of the research results was carried out according to the criterial equation obtained earlier and successfully used in the study of the shut-off valve. According to the results of the study, a criterion equation was obtained, which made it possible to establish the dependence of leakage on the magnitude of the torque for this type of reinforcement. It is shown that the dependence of the leakage on the reinforcement closing force has the same trend for the shut-off and throttle-regulating valves, which confirms the correctness of the choice of the main criteria when building and analyzing the leakage-torque dependence. However, it is necessary to find out the difference in coefficients in the criterion equations, which they inform about.

Keywords: power fittings, experimental research, medium leakage, torque, criterion equation.


1. Koroliov A. V., Pavlyshyn P. Y., Bandurko I. V. (2018). Experimental Research of Valve Tightness at Different Closure Forces. Yaderna ta radiatsiina bezpeka [Nuclear and radiation safety], vol. 80, no. 4, pp. 21-24.

2. Imbritskii I. M. (1981). Spravochnikpo armature teplovykh elektrostantsii [Handbook of valves for thermal power plants]. Moscow: Energoizdat, 304 p. (in Russ.)

3. GOST 356-80 (ST SEV 253-76). Valves and details for piping. Pressures conditional, test and operational. Lines. Moscow: Standartinform, 2006, 20 p. (in Russ.)

4. GOST 9544-2015. Pipeline valves. Leakage rates of valves, 2015, 11 p. (in Russ.)

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