The chemical industry is a basic and pillar industry of the national economy, and its speed and scale of development directly affect all links of the social economy. The chemical industry is characterized by a great variety of sectors, complex processes and diverse products, and its production discharges many types of pollutants in large quantities and with high toxicity. Therefore, pursuing sustainable development in the chemical industry has significant practical importance for human economic and social development. The modern chemical industry has long been committed to reducing emissions and improving plant safety and environmental protection, facing strict government regulatory requirements that differ from country to country and market to market. SUFA can provide the highest quality valve products to meet chemical production needs. SUFA's solutions for the chemical industry have obtained all applicable international standard certifications and meet the most stringent environmental standards, including the European low-emission (fugitive emissions) standards.

For the chemical industry, through-flow (straight-through) valves are generally selected because of their lower flow resistance; valves used for shutting off and opening the medium are usually chosen, and valves that are easy to adjust are used for flow control; ball valves and plug valves are suitable for diverting and reversing flow; valves whose closing element slides along the sealing face with a wiping action are suitable for media containing suspended particles. The most commonly used chemical valves include globe valves, ball valves, gate valves, safety valves, check valves, plug valves and so on. The media in chemical valves are mainly chemical substances, mostly acid and alkali corrosive media. The chemical industry may involve a wide variety of processes, with control established electrically, hydraulically, pneumatically and sometimes manually. The valves used must be able to handle pressure and prevent any leakage. Different valves are known for their different functions.

When selecting valves for the chemical industry, the first consideration is the scientific selection of materials. There is a common misconception that stainless steel is a "universal material" and stainless steel valves are used regardless of the medium and environmental conditions — this is very dangerous.

Key points for material selection for some common chemical media: Sulfuric acid: as one of the strongly corrosive media, sulfuric acid is an important industrial raw material with a very wide range of uses. The corrosiveness of sulfuric acid to materials varies greatly with concentration and temperature. For concentrated sulfuric acid with a concentration above 80% and a temperature below 80℃, carbon steel and cast iron offer good corrosion resistance, but they are not suitable for high-velocity sulfuric acid flow and not suitable as materials for pumps and valves; ordinary stainless steels such as 304 (0Cr18Ni9) and 316 (0Cr18Ni12Mo2Ti) are also of limited use for sulfuric acid media. Therefore, pumps and valves for transporting sulfuric acid are usually made of high-silicon cast iron (difficult to cast and machine) or high-alloy stainless steel (Alloy 20). Fluoroplastics offer good resistance to sulfuric acid, so fluoroplastic-lined valves are a more economical choice. Hydrochloric acid: the vast majority of metallic materials are not resistant to hydrochloric acid corrosion (including various stainless steels); molybdenum-containing high-silicon iron can only be used for hydrochloric acid below 30% at 50℃. In contrast to metallic materials, most non-metallic materials have good corrosion resistance to hydrochloric acid, so rubber-lined valves and plastic valves (such as polypropylene, fluoroplastics, etc.) are a better choice for transporting hydrochloric acid. Nitric acid: most metals are rapidly corroded and destroyed in nitric acid. Stainless steel is the most widely used nitric-acid-resistant material, with good corrosion resistance to nitric acid of all concentrations at room temperature. It is worth noting that molybdenum-containing stainless steels (such as 316, 316L) are not superior to ordinary stainless steels (such as 304, 321) in nitric acid resistance, and are sometimes even inferior. For high-temperature nitric acid, titanium and titanium alloys are usually used. Acetic acid: it is one of the more corrosive organic acids. Ordinary steel corrodes severely in acetic acid of all concentrations and temperatures. Stainless steel is an excellent acetic-acid-resistant material, and molybdenum-containing 316 stainless steel can also be used for high-temperature and dilute acetic acid vapor. For severe requirements such as high-temperature, high-concentration acetic acid or media containing other corrosive substances, high-alloy stainless steel valves or fluoroplastic valves can be selected.