Design and Magnetic Field Simulation Analysis of Radial Gap Adjustable Magneto Rheological Valve

The current size of the flow channel gap of most magneto rheological (MR) valve is fixed, the pressure adjustment range of such MR valve is small, and the application range is limited. A kind of radial gap adjustable MR valve with large adjustable pressure drop and wider application field is designed. Its working principle was analyzed and a mathematical model of pressure drop was established. Using the finite element software Ansoft Maxwell, the magnetic field simulation analysis of the radial gap adjustable MR valve was conducted. The results show that: 1.The yield pressure drop is only related to the current change, having nothing to do with the flow rate. The viscous pressure drop is proportional to the flow rate. 2. The pressure drop of the MR valve with adjustable radial gap of 7 mm in cross section and 9 mm in width of the magnetic isolation ring has the maximum pressure value of 3372 kPa. 3. The pressure drop rises with the increase of current under different radial gap sizes, and the smaller the radial gap, the greater the pressure drop. When the radial flow channel gap is 0.5 mm, the maximum pressure drop is 7095 kPa; when the radial flow channel gap is 2 mm, the maximum pressure drop is 2260 kPa.