According to the valve body material, welding current, welding speed and other welding process parameters, the thermal elastoplastic finite element method can be used to calculate the distribution of welding residual stress of all welded valve body. According to the calculation, the maximum welding residual stress of the valve body reaches 407MPa, far exceeding the yield strength of A105 material. Figure 1a Comparison of Calculation and Measurement Values of Axial Residual Stress of Valve Body (Simulation Distribution Results and Test Results of Welding Residual Stress in Different Directions) Figure 1b Comparison of Calculation and Measurement Values of Circumferential Residual Stress of Valve Body (Simulation Distribution Results and Test Results of Welding Residual Stress in Different Directions) Figure 1c Residual stress distribution curve in the thickness direction of valve body (simulation distribution results and test results of welding residual stress along different directions) Figure 1a and Figure 1b show the measured and calculated results of welding residual axial stress and welding residual circumferential stress respectively. It can be seen from the figure that the maximum axial stress and circumferential stress are on the outer surface of the weld center of the thick wall cylinder of the valve body, the residual stress is tensile stress, and the inner surface is compressive stress. Figure 1c shows the distribution of welding residual stress along the weld thickness direction. It can also be seen from Figure 1 that the maximum welding residual axial and circumferential calculated stress can reach the tensile strength of A105 material.

Integral metal hard seal butterfly valve Integral metal hard seal butterfly valve is mainly used in high, medium and low pressure, high temperature and low temperature pipelines to cut off and regulate. Integral metal hard seal butterfly valve is used in petroleum, chemical, metallurgy, power and other industries. Main features: 1. Compact structure, small size, light weight, flexible opening and closing. 2. Three eccentric structure is adopted, and the sealing performance is reliable after optimized design