According to different materials, valves can be divided into four common types: gray cast iron valves, ductile iron valves, carbon steel valves, and stainless steel valves.

Grey cast iron valves: suitable for working in the vast majority of low corrosive media such as alcohols, aldehydes, ethers, ketones, fats, etc. in water, steam, petroleum products, and ammonia.

Ductile iron valves: have strong corrosion resistance and can work in certain concentrations of sulfuric acid, nitric acid, sulfuric acid, and acidic salts.

Carbon steel valves: Carbon steel valves have similar characteristics to ductile iron, but carbon steel materials have wider temperature resistance and pressure bearing capacity than ductile iron. Therefore, in high-temperature and high-pressure working conditions, carbon steel valves still need to be used.

Stainless steel valves: Stainless steel valves have excellent atmospheric resistance, can withstand nitric acid and other oxidizing media, and can also resist corrosion by alkalis, water, salts, organic acids, and other organic compounds.