In pipeline engineering, the correct selection of electric valves
is one of the guarantee conditions to meet the application requirements. Improper selection of the applied electric valve will not only affect the application, but also bring adverse consequences or serious losses. Therefore, the electric valve should be correctly selected in the pipeline engineering design. The duty environment of the electric valve In addition to paying attention to the pipeline parameters, the electric valve should also pay special attention to the environmental conditions of its duty. Since the electric device in the electric valve is an electromechanical device, its duty state is greatly affected by its duty environment. Under normal conditions, the obligatory environments of electric valves are as follows: 1. Indoor installations or outdoor applications with protective methods; 2. Outdoor open-air installations, eroded by wind, sand, rain, sun, etc.; 3. Inflammable, explosive gas or Dust environment; 4 Environment in wet tropics and dry tropics; 5 The temperature of pipeline medium is as high as 480℃; 6 The ambient temperature is lower than -20℃; 7 It is easy to be flooded or immersed in water; installation) environment; 9 Environments on ships or docks (with salt fog, mold, humidity); 10 Severe vibrations; occasions prone to fire; For the electric valves in the above environments, the structure and materials of the electric devices and protection methods are different. Therefore, the corresponding valve electric device should be selected according to the above-mentioned obligation environment. The functional requirements of the electric valve are based on the engineering control requirements. For the electric valve, its control function is completed by the electric device. The purpose of applying the electric valve is to complete the non-manual electrical control or computer control for the opening, closing and adjustment of the valve. The current 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. Electrical control of electric valves Due to the continuous improvement of the level of industrial automation, on the one hand, the application of electric valves is increasing, and on the other hand, the control requirements for electric valves are getting higher and higher and more complex. Therefore, the design of electric valve in electrical control is always updated. 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 technical disclosure with the electric device consumer to clarify the technical requirements. In addition, when choosing an electric valve, it should be considered whether to purchase an additional electric valve controller. Due to the general state, the controller needs to be purchased separately. In most cases, when using a single control, it is necessary to purchase a controller, because it is more convenient and cheaper to purchase a controller than to design and manufacture it by the user. When the electrical control performance fails to meet the engineering design requirements, modification or redesign should be proposed to the consumer factory.
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