In the chemical production process, some corrosive media are often encountered, such as sulfuric acid, hydrochloric acid, nitric acid, caustic soda, various salt solutions and organic compounds. These media are sometimes single, sometimes mixed, sometimes At normal temperature and sometimes high temperature, they cause corrosion to instruments used in the field, such as regulating valves, transmitters, measuring components, pressure gauges, etc., which reduce their performance and shorten the service life, which will not only affect the normal production and new processes. The adoption of the process will also affect the improvement of industrial automation level and even cause safety accidents. It is well known that the same medium exhibits different corrosiveness depending on its concentration and temperature. Therefore, according to the corrosiveness of the medium in the production process, the correct selection of the corresponding corrosion-resistant materials can not only improve the performance and service life of the instrument, but also reduce the production cost and reduce the maintenance workload of the instrument. The use of the regulating valve in the phenol production process, the corrosion cause of the throttle valve of the regulating valve is analyzed, and the life of the regulating valve is greatly improved by correctly selecting the material of the throttle member, and a high performance-price ratio is obtained.
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Causes of corrosion of the regulating valve throttle