Analysis of the valve positioner pilot valve hole plugging

The valve positioner is an important supporting component of the regulating valve. The pilot valve is a crucial component of the valve positioner, and its major job is to reverse the gas route. The current lack of efficient solutions for internal pilot valve blockage is due to the unavoidable oil loss inside the positioner and the simple entry of external dust and other contaminants into the valve, resulting in oil blockage inside the pilot valve. The fault tree theory is utilized in this study to evaluate the reason of the pilot valve blockage problem, and it is coupled with 39 engineering factors in TRIZ theory to innovate the internal structure of the pilot valve using a contradiction matrix and 40 invention principles. The product’s dependability was then confirmed by fluid analysis using Ansys fluent.