Choose electric valve must pay attention to the important factors
In pipeline engineering, the correct selection of electric valve is one of the guarantee conditions meet the application requirements.
If improper selection for the application of electric valve, not only affect the application, but also the adverse consequences or severe losses, therefore, should correctly choose electric valves in pipeline engineering design.
A duty environment, electric valve electric valves in addition to the pipeline parameters should be paid attention to, still should pay special attention to the obligation of environmental conditions, due to the electric valve electric actuator is a mechanical and electrical equipment, in the state of its obligations by the compulsory environmental impact is very large.
Usually state, the obligation to environment of electric valve has the following kinds: 1 indoor unit or a protective way outdoor applications.
2 outdoor device, such as wind, sand, rain, sunshine erosion;
3 with inflammable, explosive gas or dust environment;
4 humid tropics, dry tropics environment;
More than 5 pipeline medium temperature up to 480 ℃;
6 environment temperature below 20 ℃ below;
7 vulnerable to water or flooding;
8 radioactive substances (
Nuclear and radioactive material test device)
Nine ships or dock (
Have salt fog, mold, moisture)
10 have severe vibration occasions;
Easy to fire situation;
For the environment of electric valve, the electric device structure, material and protective measures are different.
Therefore, should be based on the above obligations environment choose corresponding valve electric device.
The functional demands on the basis of engineering control, electric valve, electric valve, the control function is accomplished by electric actuator.
Is the purpose of the application of electric valve, the valve open, closed, and adjust the linkage to complete the artificial electric control or computer control.
At present, the electric device application has not only for human diligently.
Due to different manufacturers product functionality and quality difference is bigger, therefore, choose and select the valve electric actuator are equally important in engineering.
Third, because of the electrical control system of electric valve is always raise the level of industrial automation requirements, on the one hand, electric valves are being more and more, on the other hand has higher requirement for electric control valve, more and more complex.
So in the design of electrical control of electric valve is always updated.
With the improvement of science and technology of Shanghai valve and the popularization of computer applications, new, diverse electrical control methods will appear.
Overall control of electric valve, should pay attention to choose electric valve control mode.
According to the project need, for example, whether the application of centralized control mode, or single control mode, and other equipment, sequence control and application of computer order control, and so on, its control principle are different.
Valve electric device manufacturers are only sample standard electrical control principle, so the application department should with the consumption of electric equipment factory technical clarificaiton, clear technical requirements.
In addition, when choosing electric valve, to weigh whether additional purchase electric valve controller.
Because of the general status, the controller is need to purchase separately.
Most state, using a single control, is the need to purchase of the controller, because the acquisition controller is convenient, inexpensive than users to design and manufacture.
When the electrical control performance can't satisfy the engineering design requirements, shall be made to the consumption of plant to modify or redesign.