Abstract: Emergency shut-off valve is an important safety facility in the petrochemical industry. In order to meet the technical requirements of emergency shut- off valves for flammable and combustible liquid storage tanks, a safety reset type dual power electric actuator is designed and developed. First of all, according to the requirements of protection level, the security design of electric actuator is carried out. Then, according to the load operation characteristics and system requirements, the parameters of the super capacitor module are calculated and determined and the auxiliary power supply based on super-capacitor is developed by using the characteristics of super capacitor such as high current fast charge and discharge characteristics and good temperature environment adaptability. Finally, the system integration of the security reset dual power electric actuator is completed, which provides technical guarantee for the realization of safety production in petrochemical industry.

Key words: emergency shut- off valve, electric actuator, supercapacitor, auxiliary power supply