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Basis for Selection of Electric Valves

        In pipeline engineering, the correct selection of electric valves is one of the guarantee conditions to meet the application requirements. If the electric valve is not properly selected, it 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.
 
        Duty environment for electric valves:
 
        In addition to the pipe parameters, electric valves should pay special attention to the environmental conditions of their obligations. Because the electric devices in electric valves are electromechanical equipment, their obligations are greatly affected by their obligations.
 
        Normally, the duty environment of electric valves is as follows:
 
        1. Outdoor application of indoor devices or protective methods;
 
        2. Outdoor open-air installations, which are corroded by wind, sand, rain, sunlight, etc.
 
        3. It has flammable, explosive gas or dust environment.
 
        4. Environment in wet and dry tropics;
 
        5. The temperature of pipeline medium is over 480 C.
 
        6. The ambient temperature is below - 20 C.
 
        7. Susceptible to flooding or submergence; This article comes from dream weaving.
 
        8. The environment with radioactive substances (nuclear power plants and radioactive substance testing devices);
 
        9. The environment of ships or docks (with salt spray, mildew and humidity);
 
        10. The occasion with violent vibration; the occasion prone to fire;
 
        For the electric valves in the above environment, the structure, material and protection methods of the electric devices are different. Therefore, the corresponding electric valve device should be selected according to the above obligation environment.
        
        Functional requirements of electric valves:
 
        According to the engineering control requirements, the control function of the electric valve is completed by the electric device. The purpose of applying electric valves is to complete non-manual electrical control or computer control by opening and closing valves and regulating linkage. At present, the application of electric devices is not just for the sake of labor saving. Because the function and quality of products from different manufacturers are quite different, it is equally important to select electric devices and valves.
 
        Electric Control of Electric Valve
 
        As the requirement of industrial automation level has always been improved, on the one hand, the application of electric valves is increasing, on the other hand, the control requirements of electric valves are becoming higher and more complex. Therefore, the design of electric valve in electrical control is always updated. With the development of science and technology and the popularization and application of computer, new and diversified electric control methods will always appear. In consideration of the overall control of electric valves, attention should be paid to the selection of the control mode of electric valves. For example, according to engineering needs, whether to apply centralized control mode or single control mode, whether to interact with other equipment, sequence control or computer sequence control, and so on, their control principles are different. The sample of the manufacturer of valve electric device only gives the standard electric control principle. Therefore, the application department should make a technical statement with the consuming factory of the electric device and make clear the technical requirements.
 
        In addition, when choosing electric valves, it is necessary to consider whether additional electric valve controllers should be purchased. Because of the general state, the controller needs to be purchased separately. In most cases, it is necessary to purchase a controller when using a single controller, because it is more convenient and cheaper to purchase a controller than the user's own design and manufacture. When the electrical control performance can not meet the requirements of Engineering design, modification or redesign should be proposed to the consuming plant.