This paper recommends and compares characteristics, working principle and structure for two kinds of servo valve. Besides, the simulation was carried out in a commercially software of Ansys, hence some features of jet pipe servo valve such as outstanding advantages of working feature or reliability are analysed. | 78 SCIENCE & TECHNOLOGY DEVELOPMENT, Vol 20, 2017 Comparison of jet pipe servo valve with flapper nozzle servo valve Pham Xuan Hong Son, Tran Thien Phuc Abstract— Electro-hydraulic servo valves (EHSVs) serve as an interface between electrical devices and hydraulic systems. They are capable of converting low power electrical input into movement of a spool to control precisely high power, low speed hydraulic actuators. Nowadays, jet pipe electro-hydraulic servo valve and flapper nozzle electro-hydraulic servo valve are typical two-stage control flow servo valve and are the most popular in use. This paper recommends and compares characteristics, working principle and structure for two kinds of servo valve. Besides, the simulation was carried out in a commercially software of Ansys, hence some features of jet pipe servo valve such as outstanding advantages of working feature or reliability are analysed. Index Terms— jet pipe servo valve, flapper nozzle servo valve, comparison, electro-hydraulic servo valve. 1 INTRODUCTION N owadays, jet pipe electro-hydraulic servo valve and flapper nozzle servo valve are two kinds of servo valve which are the most popular in application for air-force, aviation industry or universe industry. However, to distinguish clearly about structure and working principle between jet pipe servo valve and flapper nozzle servo valve was not shown. Therefore, this paper is proposed. 2 WORKING PRINCIPLE OF SERVO VALVE. Flapper nozzle electro-hydraulic servo valve In , sketch diagram of working principle for flapper-nozzle electro-hydraulic servo valve is Manuscript Received on May 16th, 2016, Manuscript Revised February 22nd, 2017 Pham Xuan Hong Son was with Ho Chi Minh City University of Technology, Vietnam National University – Ho Chi Minh City, e-mail: pxhongson@. Tran Thien Phuc now with the Faculty of Mechanical Engineering, Ho Chi Minh City University of Technology, Vietnam National University – Ho Chi Minh City,
