In pipeline engineering, the correct selection of electric valves is one of the guarantee conditions for meeting application requirements. If the selection of electric valves used is inappropriate, it will not only affect the application, but also bring adverse consequences or serious losses. Therefore, electric valves should be selected correctly in pipeline engineering design.
Obligation environment for electric valves
In addition to paying attention to pipeline parameters, electric valves should also pay special attention to the environmental conditions of their obligations. As the electric device in electric valves is an electromechanical device, its obligation status is greatly affected by its obligation environment.
Under normal conditions, electric valves operate in the following duty environments:
1. Indoor devices or outdoor applications with protective measures;
2. Outdoor outdoor devices with erosion from wind, sand, rain, sunlight, etc;
3. Have flammable, explosive gas or dust environments;
4. Environment in humid and dry tropical regions;
5. The medium temperature of the pipeline can reach over 480 ℃;
6. The ambient temperature is below -20 ℃;
7. Easily submerged or submerged in water;
8. Environments with radioactive materials (nuclear power plants and radioactive material testing devices);
9. Environment on ships or docks (with salt mist, mold, moisture);
10. Situations with severe vibration; Places prone to fire;
For electric valves in the above environment, their electric device structure, materials, and protection methods are different. Therefore, the corresponding valve electric device should be selected based on the above obligation environment.
Functional requirements for electric valves
According to engineering control requirements, for electric valves, their control function is completed by electric devices. The purpose of applying electric valves is to achieve non manual electrical or computer control of the opening, closing, and adjustment linkage of valves. The current application of electric devices is no longer just about saving manpower. Due to significant differences in the functionality and quality of products from different manufacturers, the selection of electric devices and the selection of matched valves are equally important for engineering.
Electrical control of electric valves
Due to the constantly increasing requirements for 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 also becoming higher and more complex. So the design of electric valves in terms of electrical control is also constantly being updated. With the advancement of science and technology and the widespread application of computers, new and diverse electrical control methods will always emerge.
When considering the overall control of electric valves, attention should be paid to selecting the control method of electric valves. For example, depending on the engineering needs, whether to apply centralized control method or single control method, whether to link with other equipment, sequence control or computer sequence control, etc., the control principles are different. The sample provided by the valve electric device manufacturer is only the standard electrical control principle, so the application department should conduct technical disclosure with the electric device consumer factory to clarify the technical requirements.
In addition, when selecting electric valves, consideration should be given to 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 unit, it is necessary to purchase a controller, as purchasing a controller is more convenient and cheaper than designing and manufacturing it by users themselves. When the electrical control performance cannot meet the engineering design requirements, modifications or redesign should be proposed to the consumer factory.
