An Investigation of the Drive of a Shut-Off Valve Under Conditions of Intense Power Demand

Abstract

Analytic and computer models of the drive of the DAPS-22.000 shut-off valve are developed and a technique for calculating and applying an estimate of the torque developed by the drive as a function of the angle of deflection of the shaft of the rocker arm is proposed. The three-dimensional computer model of the drive which is constructed differs from the analytical model in that contact surfaces that take into account the frictional forces and moments of friction are introduced into the equations. An experiment designed to measure the torque created by the drive is performed in order to verify the numerical results. An analysis of the results is conducted and practical recommendations for developers of this type of equipment are presented. It is established that the results of the analytical and numerical investigations are in good agreement with the experimental data and are mutually complementary, attesting to a high degree of reliability of the data as well as the adequacy of the newly developed mathematical models. It is shown that the frictional forces do not exert a major influence on the magnitude of the torque, though they do not affect the nature of the variation of the torque. In the course of the computer simulation it is established that the principal part of the drive becomes deformed as a result of substantial loads, and that this exerts an adverse effect on the movement of the drive. Thus, under specified technological forces, it is best if the design is implemented to take into account the flexibility of the links.