1. Indoor installations or outdoor applications with protective methods;
2. Outdoor open-air installations, eroded by wind, sand, rain, sunlight, etc.;
3. With flammable, explosive gas or dust environment;
4. Environment in wet tropics and dry tropics;
5. The temperature of the pipeline medium is as high as 450 ℃ or more;
6. The ambient temperature is below -20℃;
7. Easily flooded or immersed in water;
8. Environment with radioactive substances (nuclear power plants and radioactive substances test equipment);
9. Environment on ships or docks (with salt spray, mold, humidity);
10. Occasions with severe vibration; occasions prone to fire;
For the electric ball valve in the above environment, the electric device structure, material and protection method are all different. Therefore, the corresponding valve electric device should be selected according to the above-mentioned obligation environment. According to the engineering control requirements, for the electric ball valve, its control function is completed by the electric device. The purpose of applying the electric ball valve is to complete the non-manual electrical control or computer control for the opening, closing and adjustment of the valve. The application of electric devices is not just for diligent labor. Since the functions and quality of products of different manufacturers are quite different, the selection of electric devices and the selection of valves are equally important to the project. Due to the continuous improvement of the requirements of industrial automation level, on the one hand, the application of electric valves is increasing, and on the other hand, the control requirements for electric valves are also getting higher and higher and more complicated. Therefore, the design of electric valve in electrical control is always updated. With the continuous improvement of use requirements and the popularization of computers, new and diverse electrical control methods will always appear. For the scrutiny of the overall control of the electric valve, attention should be paid to the selection of the control method of the electric valve. For example, according to the needs of the project, whether to use the centralized control method, or the single control method, whether it is linked with other equipment, sequence control or computer sequence control, etc., the control principles are different. The valve electric device manufacturer's sample only gives the standard electrical control principle, so the application department should make a technical disclosure with the electric device consumer to clarify the technical requirements.
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