Abstract:Taking the hydraulic control of the gas butterfly valve as an example and based on existing various defects and potential risks of traditional hydraulic control loops, an optimized and innovative design combining three functions of continuous oil supply, standby of double insurance and automatic switch over, was proposed. A new hydraulic circuit model with double insurance based on operational functions was built up. The functions, structural characteristics and working principles of this hydraulic circuit were analyzed in order to solve the functional defects of traditional hydraulic control loops and avoid the potential accidents arising.