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   In order to solve the problem of fluid-structure coupling vibration in the valve stem-stem system of single-seat control valve , a fluid-structure interaction dynamic model of the valve stem-valve stem of regulator valve was established, and the fixed opening And the degree of openness, the flow direction of the flow and the flow of the closed dynamic response simulation analysis.
The results show that the valve positioner has the function of reducing the displacement response of the valve core and the offset of the valve core. Selecting proper positioner parameters can ensure that the valve dynamic performance is in good condition. For a fixed degree of opening, regardless of flow or open flow, the steady-state displacement of the valve spool and the fluid force increases with the pressure difference and the target displacement decreases (opening degree increases), the spool dynamic displacement The transition time is shortened with the increase of differential pressure, while the spool displacement response amplitude is larger than that of flow closed type when flowing open. For the opening decreases, the flow of the valve to flow relative to the flow when the valve spool dynamic displacement transition time is shorter, the flow closed flow, the greater the pressure drop, spool dynamic displacement of the transition time is shorter, and the flow direction The contrary; for the opening increases, the spool dynamic displacement transition time and the pressure difference between the opening and the reduction of the opposite situation.
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