Sharif University of Technology Scientia Iranica 1026-3098 17 5 2010 10 01 Simulation and Experimental Validation of Flow-Current Characteristic of a Sample Hydraulic Servo Valve 3337 EN M. Saadat Foumani Department of Mechanical Engineering,Sharif University of Technology M. S. Sadooghi Department of Mechanical Engineering,Bu-Ali Sina University R. Seifi Department of Mechanical Engineering,Bu-Ali Sina University Journal Article 2010 11 03 This paper presents a novel model to simulate the ow-current characteristic curve of an electro-hydraulic servo valve in steady state condition. This characteristic curve has three major zones: dead zone, linear zone and saturation zone. By using the presented approach, we can simulate the behavior of all types of valves including under lapped, critical center (zero lapped) and over lapped valves. A hydraulic tester has been designed and constructed for validation of the results. It can test the performance of ow-current and some other properties of the valve. Comparison of experimental and simulated curves describes that the model has an acceptable accuracy in determining the four important valve characteristics: ow gain, saturation ow, saturation current and dead zone. As a result, the model can be used for other studies such as geometrical sensitivity analysis (the ultimate objective of this modeling) or design optimization. Since this model is presented in a computer based algorithm, it can be easily used to observe and measure the eects of change in the parameters of interest (particularly geometrical parameters of the valve) on the ow-current curve. https://scientiairanica.sharif.edu/article_3337_e76a676a8cb9fd15f9b2182295996600.pdf