Stress-strain state in a high-pressure electromagnetic valve

Abstract

Ignorance of stress distribution patterns in the different elements of high-pressure armatures frequently results in an unjustified safety factor at some places and the development of dangerous strains at others. The authors studied stress distribution in an electromagnetic valve, which is complex in design with high gradients of stress zones. The stress-strain state was studied by a polarization-optical method and by holographic interferometry together with the numerical potential method. The maximum stress state was found in the zone of a vertical section. Nearly axisymmetric stress distribution was noticed in the valve body. A change in the sign of stresses was noticed directly along the welded joint. Also under study was the thermal stress state in this valve design under conditions of settled flow of the working medium. The magnitude of maximum thermal stresses was not much and ranged from 8 to 10% of the maximum stresses arising in the apparatus under the influence of the pressure of the working medium. Based on the data obtained, several alterations were made in the design of the electromagnetic valve, optimizing the stress distribution and reducing the wall thickness in places.