Design of A Novel Electro-Hydraulic Rotary Valve with Continuous Adjustable Rated Flow
Author(s):
Y. Sang*, X. Wang, & X. X. Li
Affiliation(s):
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.
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