Study on static and dynamic characteristics of [?]6 mm open center 2 D digital servo valves

ZUO Qiang， LV Min-jian， RUAN Jian， LI Sheng， ZHU He
（Key Laboratory of Special Purpose Equipment and Advanced Processing Technology， Ministry of Education，Zhejiang University of Technology， Hangzhou 310014， China）

Abstract： Aiming at possible instability of static and dynamic characteristics of the open center 2D digital servo valve，the structure，working principle and anti-pollution ability of the open center 2D digital servo valve were analyzed. On this basis，a test experiment platform was designed and built. Under the rated pressure 21 MPa，experimental study about the static and dynamic characteristics of six [?]6 mm open center 2D digital servo valves whose nominal flow were 50 L/min had been done. The results indicate that the six valves fully meet the standard values ??of the static characteristics of the servo valve. Their hysteresis loops are all less than 5%，degree of asymmetrys are all less than 10% and non-linearitys are all less than 7.5%. Their frequency responses are not less than?110 Hz at -3 dB of 25% rated flow and rising time of step response is less than 10.8 ms. So，six [?]6 mm open center 2D digital servo valves have excellent static and dynamic characteristics and good processing consistency. Instability about static and dynamic characteristics of the open center 2D digital servo valves are nonexistent.
Key words： two-dimensional valve； servo valve； digital control； static and dynamic characteristics