Effect of Internal Leakage on an Electro-Hydraulic Servo-Driven Control Valve Performance
The principle of an electro-hydraulic servo-driven control valve used to regulate mixed-gas pressure in combined cycle power plant is introduced. The mathematic model for describing the dead-band characteristics of the electro-hydraulic servo-driven control valve is built. The effect of driving system leakage of the control valve on the performances of the control valve is analyzed. The results show that the dead band of the electro-hydraulic servo-driven control valve increases with the rise of the system leakage, the leakage affects the response rapidity and the control accuracy of the control valve, and the valve control effect on the pressure pulsation of the mixed gas decreases with the increase of the system leakage.
Y. D. Xie et al., "Effect of Internal Leakage on an Electro-Hydraulic Servo-Driven Control Valve Performance", Applied Mechanics and Materials, Vols. 99-100, pp. 901-905, 2011