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<p>The deflector-jet pilot stage (DJPS) driven electro-hydraulic servo valve (EHSV) is a critical component of aircraft control systems and various industrial applications. These valves convert torque motor signals into deflector movements, generating a pressure difference across the receiver ports to drive the valve spool. This pressure difference is highly sensitive to the complex flow patterns dictated by the intricate microscale structure of the DJPS. This study investigates the sensitivity of the pressure difference to the structural dimensions of the DJPS using a comprehensive matrix encompassing all potential geometric variants. The results indicate that the flow rate is primarily affected by the nozzle throat width and jet pan depth, whereas the pressure difference is most significantly affected by the shunt wedge width. Specifically, a 67% increase in nozzle throat width leads to a 39.2% increase in pressure difference. Conversely, when the wedge thickness is increased from 0.000&#xa0;mm, representing a sharp edge, to 0.200&#xa0;mm, the pressure difference decreases by 55.4%. These findings provide a framework for optimizing DJPS geometry and quantifying the performance degradation caused by erosive wear or manufacturing tolerances, thereby ensuring more precise hydraulic control. The findings also serve as a foundational dataset for designers.</p>

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Deflector-jet pilot stage performance of electro-hydraulic servo valve depending on microscale structure

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月29日

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  • Osman Demirci,
  • Mahmut Faruk Aksit,
  • Ramazan Ateş,
  • Mustafa Bozoğlu,
  • Samet Polat,
  • Yahya Doğu

摘要

The deflector-jet pilot stage (DJPS) driven electro-hydraulic servo valve (EHSV) is a critical component of aircraft control systems and various industrial applications. These valves convert torque motor signals into deflector movements, generating a pressure difference across the receiver ports to drive the valve spool. This pressure difference is highly sensitive to the complex flow patterns dictated by the intricate microscale structure of the DJPS. This study investigates the sensitivity of the pressure difference to the structural dimensions of the DJPS using a comprehensive matrix encompassing all potential geometric variants. The results indicate that the flow rate is primarily affected by the nozzle throat width and jet pan depth, whereas the pressure difference is most significantly affected by the shunt wedge width. Specifically, a 67% increase in nozzle throat width leads to a 39.2% increase in pressure difference. Conversely, when the wedge thickness is increased from 0.000 mm, representing a sharp edge, to 0.200 mm, the pressure difference decreases by 55.4%. These findings provide a framework for optimizing DJPS geometry and quantifying the performance degradation caused by erosive wear or manufacturing tolerances, thereby ensuring more precise hydraulic control. The findings also serve as a foundational dataset for designers.