How to choose the right electric actuator
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Release Time：2018-03-13
1. Determine the electrical parameters according to the selected electric actuator. Due to the differences in the electrical parameters of different electric actuator manufacturers, it is generally necessary to determine the electrical parameters during design and selection, mainly including motor power, rated current, secondary control circuit voltage, etc. As a result, the mismatch between the control system and the electric actuator parameters causes faults such as trip, fuse fusing, thermal overload relay protection jump, etc. 2. Determine the output torque of the electric actuator according to the torque required by the valve. The torque required for the opening and closing of the valve determines the output torque of the electric actuator. Generally, it is determined
1. Determine the electrical parameters according to the selected electric actuator
Due to the difference in electrical parameters of different electric actuator manufacturers, it is generally necessary to determine the electrical parameters during design and selection, mainly including motor power, rated current, secondary control circuit voltage, etc. As a result, the mismatch between the control system and the electric actuator parameters causes faults such as trip, fuse blowing, thermal overload relay protection jump, etc.
2. Determine the output torque of the electric actuator according to the torque required by the valve
The torque required for valve opening and closing determines the output torque of the electric actuator. Generally, it is proposed by the user or selected by the valve manufacturer. As the actuator manufacturer, it is only responsible for the output torque of the actuator. The torque required for normal valve opening and closing is determined by the valve diameter, working pressure and other factors. However, due to the difference in processing accuracy and assembly technology of the valve manufacturer, the torque required for valves of the same specification produced by different manufacturers is also different, even if the torque of the same specification valve produced by the same valve manufacturer is different, when the torque selection of the actuator is too small, the valve cannot be opened and closed normally. Therefore, the electric actuator must choose a reasonable torque range.
The reliability change law of electric actuator in the life period is the basis of studying its reliability, which depends on the early failure, random failure and wear failure. In theory, the reliability (R) is commonly used to characterize the reliability of the equipment, which refers to the probability that the equipment completes the specified function within the specified conditions and time. For the sake of simplicity and intuition, the electric actuator industry simply uses the mean time to failure (MTBF) to characterize the reliability of the characteristic quantity, and as a performance index representing the reliability of the electric actuator. The reliability of electric actuators is generally restricted and affected by the following main factors: system selection and design, component/component applicability, action parameters, mechanical structure, manufacturing technology, assembly accuracy, operation and maintenance personnel ability, operation and maintenance procedures, operation correctness, maintenance results, on-site assembly and construction conditions, degradation of spare parts performance, transportation and use impact, etc.
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