In China, due to historical reasons, electric devices and electric actuators belong to different industries. Electric devices belong to the general machinery industry, and the technical department is Hefei General Machinery Research Institute; electric actuators belong to the mechanical instrument industry, and the technical department is industrial automation. Instrument Research Institute. There are differences between the two in terms of implementation standards, structural design, supporting motors, functions, etc. This concept has reached a consensus in the domestic industry, that is, electric devices are mainly positioned in terminal control (switch type), and electric actuators should be mainly positioned In process control (regulating type). The division of this kind of industry in China has created a different industry pattern from Germany, the United States, Japan and other European and American countries. In foreign countries, whether it is a switch type or a regulating type, the English word is 'ElectricActuator(ControlValve) belongs to the valve
industry. It can be seen that although the valve electric device originated from abroad, it has obvious Chinese characteristics after its development in China. Combining with industrial shut-off valves to form electric valves is an application form of electric devices. It is a widely used type of valve drive device. Other drive devices include: manual devices, pneumatic devices, hydraulic devices, gas-liquid linkages Device, electro-hydraulic linkage device, etc. The application fields of electric valves involve petroleum, chemical, electric power, nuclear energy, metallurgy, shipbuilding, light industry, food, municipal administration, etc. Therefore, electric devices have become one of the commonly used basic equipment in pipeline control systems.
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