How To Choose Corrosion-resistant Valves?
Hydrochloric acid: Most metal materials, including various stainless steel materials, are not resistant to hydrochloric acid corrosion, and high silicon ferrosilicon can only be used for 30% hydrochloric acid below 50 ¡æ. Contrary to metal materials, most non-metallic materials have good corrosion resistance to hydrochloric acid, so rubber lined valves (such as fluoroplastics) are the best choice for transporting hydrochloric acid. However, if the medium temperature exceeds 150 ¡æ or the pressure exceeds 16 kilograms, any plastic (including chloroplastics or even polytetraethylene) will be difficult to handle. Hydrochloric acid that exceeds this condition is not available on the market.
How to choose corrosion-resistant valves when there is an ideal valve?
Sulfuric acid: As one of the highly corrosive media, sulfuric acid is an important industrial raw material with a wide range of uses. The corrosion of materials varies greatly with different concentrations and temperatures of sulfuric acid. For concentrated sulfuric acid with a concentration greater than 80% and a temperature less than 80 ¡æ, carbon steel and cast iron have good corrosion resistance, but are not suitable for high-speed flowing sulfuric acid, Not suitable for valve materials, ordinary stainless steel such as 304 and 316 also have restrictions on the use of sulfuric acid media. Therefore, pump valves for transporting sulfuric acid are usually made of high silicon cast iron (with high difficulty in casting and processing), high alloy stainless steel (No. 20 alloy valve), fluoroplastics, etc., which have good sulfuric acid resistance. If the pressure is too high and the temperature rises, the use point of plastic valves will be affected, so only ceramic balls that are much more expensive can be chosen.
