13.5. Asymmetry of the nozzle flapper valve of the two-stage electrohydraulic servo valve with force feedback

In manufacture and assembly of the electrohydraulic servo valve, theoretically symmetrical micro-structure of the nozzle flapper valve often exhibits asymmetrical characteristics, such as asymmetrical nozzle baffle clearance and asymmetrical nozzle diameter. Small asymmetry of structure may have a great influence on the characteristics of the electrohydraulic servo valve, and some asymmetric structures may also improve the performance of the electrohydraulic servo valve. So far, there is little research on the asymmetric structure of the nozzle baffle valve of the electrohydraulic servo valve and its influence on valve characteristics. ...

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