Erosion problems and solutions of electric valve How to use electric valve accurately

Erosion problems and solutions of electric valve How to use electric valve accurately

 
In terms of the problems and solutions of erosion-resistant electric valves produced for erosive media, the inner cavity of the valve body and the ball core are lined with erosion-resistant and age-resistant polyperfluorinated ethylene, so it has reliable erosion resistance and sealing property.

The chemical erosion of metals depends on the temperature, the mechanical load of the abrasive parts, the duration of the contact between the sulfide contained in the lubricating material and its acid resistance and the medium, the catalytic effect of the metal on the nitridation process, the conversion rate of the molecules of the erosive substances to the metal and so on.

1. The erosion of electric valve is usually understood as the destruction of metal materials of electric valve under the action of chemical or electrochemical environment. Because erosion occurs in the spontaneous interaction between metals and the surrounding environment, how to isolate metals from the surrounding environment or to use more non-metallic synthetic materials has become a common concern of people.

2. As is known to all, metal erosion and destruction have a large impact on the service life, reliability and service life of electric valves. Mechanical and erosion factors acting on the metal increase the total amount of wear on the contact surface. Electric valve in the process of operation, friction surface total wear. During the operation of an electric valve, the friction surface is worn and damaged as a result of simultaneous mechanical action and chemical or electrochemical interactions between the metal and the environment. For the electric valve, the pipeline working weather premise is complex; The rise of hydrogen sulfide, carbon dioxide and some organic acids in petroleum, natural gas and oil reservoir water increases the destructive power of the metal surface, thus rapidly losing the ability to work.

3, because the chemical erosion of the metal depends on the temperature, the mechanical load of the friction parts, the sulfide contained in the lubricating material and its acid resistance and the medium contact duration and the catalytic effect of the metal on the nitriding process, the conversion rate of the molecules of the erosive substances to the metal and so on. Therefore, the anti-corrosion method (or measures) of metal electric valve and the application of synthetic material electric valve have become one of the research topics of electric valve industry at present.

4, metal electric valve anticorrosion, can be understood as the metal electric valve coated with the premise of protection from erosion (such as paint, paint, lubricating materials, etc.), so that the electric valve whether in manufacturing, retention, transportation is still in the whole process of its use are not eroded.

5, metal electric valve anticorrosion method depends on the demand of the protection period, transportation and retention premise, electric valve structure characteristics and materials, of course, adapt to consider the economic effect of anti-corrosion.

How exactly should electric valves be used

Electrical control of electric valve because of the continuous progress of the level of industrial automation requirements, one side is facing the use of more and more electric valves, the other side is facing the control requirements of electric valves are becoming higher and higher, more and more complex. So the design of electric valve in electrical control is also constantly updated. With the improvement of science and technology and the popularization of computer, the new and various electrical control methods will continue to rise. For the consideration of the overall control of the electric valve, attention should be paid to the choice of the control mode of the electric valve. For example, according to the needs of the project, whether to use the centralized control mode, is still a single control mode, whether to link with other equipment, program control is still the application of computer program control, and so on, its control principle is different. The sample given by the valve electric device manufacturer is the scale electrical control principle, so the use part should be technical disclosure with the electric device manufacturer to clarify the technical requirements. In addition, when choosing electric valves, we should consider whether to purchase additional electric valve controller. In general, the controller is purchased separately. In most cases, when using a single control, it is necessary to buy a controller, because the purchase of a controller is easier and cheaper than the user’s own design and manufacture. When the electrical control function can not meet the engineering design requirements, should be put forward to the production plant to modify or redesign.

According to the engineering control requirements, the control function of the electric valve is completed by the electric device. The purpose of using electric valve is to open, close and adjust the valve linkage to achieve non-artificial electrical control or computer control. The current use of electric devices is not just to save manpower. Because the function and quality of the products of different manufacturers are different, therefore, the selection of electric devices and the selection of valves is important to the engineering equality.

In pipeline engineering, the accurate selection of electric valves is one of the prerequisites to meet the requirements of use. If the electric valve used is not selected properly, it will not affect the use, but also bring adverse consequences or severe losses. Therefore, the electric valve should be accurately selected in the design of pipeline engineering. In addition to the pipeline parameters, the electric valve should pay special attention to the environmental premise of its work. Because the electric device in the electric valve is a mechanical and electrical equipment, its working condition is greatly affected by its working environment.

Normally, the electric valve is in the following working environment:

1. Indoor installation or outdoor use with protective measures;

2, outdoor installation, wind, sand, rain, sunshine and other corrosion;

3, with flammable, explosive gas or dust environment;

4, hot and humid zone, dry tropical environment;

5, the temperature of the pipeline medium is as high as 480℃ or above;

6, the ambient temperature is below -20℃;

7. Easy to be flooded or immersed in water;

8, with radioactive material (nuclear power plants and radioactive material test equipment) environment;

9. The environment on the ship or dock (with salt spray, mold, wet);

10, with violent vibration occasions;

11, prone to fire occasions; For the electric valve in the above environment, its electric device structure, materials and protective measures are different. Therefore, the corresponding valve electric device should be selected according to the above working environment.