Design of A Novel Electro-Hydraulic Rotary Valve with Continuous Adjustable Rated Flow
Y. Sang*, X. Wang, & X. X. Li
ABSTRACT: Servo valve with smaller rated flow can guarantee the static control precision and servo valve with larger rated flow can guarantee the dynamic response in the electro-hydraulic servo control system. In order to obtain static high-precision control and good dynamic response, more than one servo valve with different rated flow must be used in the system. However, the extra spare servo valves are more expensive, frequent replacement of the servo valves may bring contaminating problem. A novel electro-hydraulic rotary valve with continuous adjustable rated flow (adjustable-area gradient) is proposed to solve this problem in this paper, which is easy to change flow gain and can realize the functions of throttling and directional control. The structure and operating principle of the novel electro-hydraulic rotary valve have been explained in detail. Its steady-state flow torque has been analyzed by establishing the mathematical model. The simulations for steady-state flow torque and flow characteristic have been carried out. The result shows that valve sleeve and spool structure have opposite effects on steady-state flow torque and flow. Four kinds of optimized scheme have been analyzed through simulation. This paper will provide a reference to develop the adjustable-area gradient rotary electro-hydraulic valve.
Keywords : Rotary valve; Operating principle; Steady-state flow torque; Flow characteristic; Structure optimization.
 J. J. Sallas, “Low inertia servo valve”, US, patent: 5467800, 1995.
 N. M. Nidhiry and R. Saravanan, “Scheduling Optimization of FMS Using NSGA-II”, Advances in Industrial Engineering and Management, vol. 3, no. 1, pp. 73-78, 2014. doi: 10.7508/AIEM-V3-N1-73-78.
 M. B. Leonard, “Rotary servo valve”, US, patent: 5954093, 1999.
 J. Cui, “Research on key technology of rotary direct-drive electro-hydraulic servo valve”, Ph.D. dissertation, Zhejiang University, Hangzhou, Zhejiang, China, 2008.
 X. Zhang, “Performance analysis and experimental research on 2D digital valve of adjustable area gradient”, M.S. thesis, Zhejiang University of Technology, Hangzhou, Zhejiang, China, 2011.
 B. Zhang, Z. Wang, T. Wang, and L. Sun, “Design of hydraulic telescopic grouted clamp device and analysis of its closing collision”, Journal of Coastal Research, vol. 27, pp. 471-477, 2015.
 C. X. Wang, Hydraulic servo control system. Beijing: China Machine Press, 1989.
 Y. L. Fu, Z. C. Pei, G. B. Song, and Z. L. Wang, “Analysis of new type direct drive servo valve’s steady-state flow force”, Machine Tool & Hydraulics, no. 6, pp. 18-20, 1998.
 W. X. Peng, L. S. Wang, M. L. Zhang, and Z. Lin, “Separation characteristics of lignin from Eucalyptus camaldulensis lignincelluloses for biomedical cellulose”, Pakistan Journal of Pharmaceutical Sciences, vol. 27, pp. 723-728, 2014.
 C. G. Lu and J. L. Li, The analysis and design of hydraulic control system. Beijing: Coal Industry Press, 1991.
 Z. Z. Han, J. Wang, and X. P. Lan, Examples and application of FLUENT fluid simulation calculation of engineering. Beijing: Beijing Institute of Technology Press, 2004.
 X. R. Gao, “Numerical simulation of the flow field inside hydraulic spool valve based on fluent”, Mechanical Management And Development, vol. 110, no. 5, pp. 49-53, 2009.
 Y. Yu, FLUENT introductory and advanced tutorial. Beijing: Beijing Institute of Technology Press, 2008.
 B. Yuan, L. Y. Yu, J. Ke, and X. H. Liu, “CFD simulation of the rotating phenomenon of hydraulic slide valve”, Machine Tool & Hydraulics, no. 3, pp. 131-134, 2006.
 Y. S. Yang, G. Emanuele, J. S. Dai, T. Boaventura, and D. G. Caldwell, “Modeling of a novel 3-way rotary type electro-hydraulic valve”, in Proceedings of the 2010 IEEE International Conference on Information and Automation, 2010, pp.1463-1468.
 S. S. Duan, P. X. Yao, and H. Zhang, “Steady-state fluid force of spool valve and its compensation method”, Fluid Power Transmission and Control, vol. 40, no. 3, pp. 27- 30, 2010.
 J. B. Wu, F. Chen, and L. L. Xu, “Steady-state flow force simulation and analysis of oblique-inlet spool valves”, Huazhong Univ. of Sci&Tech. (Natural Science Edition) , vol. 39, no. 11, pp. 109-111, 2011.