With the advance of the skills, industrial production of high temperature, high pressure, deep cold, high vacuum, strong corrosion, radioactive, flammable and explosive and other high parameters of the increasing number of clutter conditions, and then the use of the valve safety, Life and other aspects of the proposed higher and more stringent demand.

       As the "corrosion" phenomenon occurs in the metal and the surrounding environment spontaneous interaction, how to metal and the surrounding environment or more use of non-metallic synthetic materials, is the focus of anti-corrosion. The corrosion of the valve is usually understood as the destruction of the valve metal material under the action of a chemical or electrochemical environment.

       There are two forms of corrosion of the valve body, namely, chemical corrosion and electrochemical corrosion. Its corrosion rate depends on the temperature of the medium, pressure, chemical properties and corrosion resistance of the valve body material. Corrosion rate can be divided into six:

 1, complete corrosion resistance: corrosion rate of less than 0.001 mm / year;

 2, very corrosion resistance: corrosion rate of 0.001 to 0.01 mm / year;

 3, corrosion: corrosion rate of 0.01 to 0.1 mm / year;

 4, still corrosion resistance: corrosion rate of 0.1 to 1.0 mm / year;

 5, poor corrosion resistance: corrosion rate of 1.0 to 10 mm / year;

 6, not corrosion: corrosion rate greater than 10 mm / year.

       Although the body anti-corrosion information is very rich, but the election can be appropriate, or not easy things, because the corrosion problem is very complex, then the body corrosion protection methods which?

       First, choose the right selection of materials. The difficulty of selecting the valve body material, but also can not only consider the corrosion problem, and must consider the pressure and temperature resistance, whether the economy is reasonable, easy to buy and other factors.

       Followed by taking lining measures, such as lining lead, lining aluminum, lining engineering plastics, lining natural rubber and various synthetic rubber. Such as media conditions permit, this is a way to save.

       Again, in the case of pressure, the temperature is not high, with non-metallic valve main material, often can be very effective in controlling corrosion.

       In addition, the outer surface of the valve body is also subject to atmospheric corrosion, the general steel materials are to paint to protect.