Valve corrosion is the main cause of valve failure. Chemical corrosion and electrochemical corrosion are two forms of valve corrosion. The corrosion rate of the valve depends on the temperature, pressure and chemical properties of the valve flow stop valve. Once the valve seal is corroded, it needs to be repaired or replaced. The corrosion of the valve cannot be completely eliminated. We can do corrosion treatment by technical means to effectively reduce the corrosiveness of the valve.
First, understand the corrosion rate. The corrosion rate is the thickness of the valve body material consumed per unit time. The corrosion rate can be used to judge the service life of the valve, whether there is excessive corrosion of the valve, and whether the valve is selected and used.
1 , complete corrosion resistance: corrosion rate is less than 0.001 mm / year;
2 , extreme corrosion resistance: corrosion rate 0.001 to 0.01 mm / year;
3 , corrosion resistance: corrosion rate of 0.01 to 0.1 mm / year;
4 , still resistant to corrosion: corrosion rate of 0.1 to 1.0 mm / year;
5 , poor corrosion resistance: corrosion rate of 1.0 to 10 mm / year;
6 , non-corrosion resistance: corrosion rate is greater than 10 mm / year.
What are the corrosion prevention measures in the valve manufacturing and design process?
1 , the first is the selection of materials  This is an important factor in preventing valve corrosion. Usually, water, oil, and gas usually use cast steel valves. If corrosive media such as acid and alkali are used, stainless steel should be selected. Generally, the temperature is below 200 °C. Stainless steel will produce a passivation film in the medium to prevent further. corrosion. A highly corrosive medium requires a very high temperature and a high corrosion resistant alloy material. The medium is reducing, choose stainless steel with Mo ; the medium is oxidizing, choose stainless steel with Cr .
2 , surface coating paint coating valve surface is also a common anti-corrosion means. The epoxy resin paint on the surface of the elastic seat sealing gate valve is the treatment method.
3. The lining material is used to isolate the medium from the valve body flow passage. The lining material comprises lining engineering plastics, lining natural rubber and various synthetic rubbers. Generally only used at lower pressures and lower operating temperatures.
4 , surface plating valve surface chrome plating, nickel plating, copper plating can also effectively achieve the effect of corrosion prevention.
Sanjing Valve specializes in producing high and medium pressure valves , electric valves , pneumatic valves , power station valves , high temperature valves , American standard valves , forged steel valves , stainless steel valves , hydraulic control valves and other thousands of valve series products for more than ten years. Professional solutions, including design, customization, package, operation, and service. We have been committed to the leader in the field of valve industry in China, providing you with new valve knowledge, good service, and technical consultants from Zuijia. If you have any questions, you can call us and we will do our best to provide you with quality service. We are determined to become the world's first Chinese valve manufacturer
Article from: Yongjia Sanjing Valve Co., Ltd.
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