Butterfly valve, also known as flap valve, is a simple regulating valve, mainly used for the on-off control of low-pressure pipeline media. The material selection of butterfly valve is very important because it is directly related to the performance, life and application range of the valve.
The main components of butterfly valves include valve body, valve stem, butterfly plate and sealing ring. The material selection of valve body is diverse, the common ones are cast iron (including gray cast iron and ductile iron), cast steel, stainless steel, aluminum alloy and plastic. Gray cast iron butterfly valves are mainly used in water systems, but they are easy to rust and have a relatively short service life; ductile iron butterfly valves have performance close to carbon steel and are widely used in water system pipelines; cast steel butterfly valves have high strength and good corrosion resistance, and are suitable for medium and high pressure and corrosive media; stainless steel butterfly valves have excellent corrosion resistance and rust resistance, and are particularly suitable for pipelines that require corrosion and rust prevention; aluminum alloy butterfly valves are lightweight and high-strength, and are suitable for special occasions, such as low temperature, high temperature, high pressure, etc.; plastic butterfly valves are lightweight, easy to install, low resistance, low price, etc., and are suitable for highly corrosive media.
The material selection of valve plate and valve seat also needs to be determined according to the medium characteristics and working environment. Common valve plate materials include nylon, cast steel, stainless steel, ductile iron electroplating, etc., while valve seat materials include EPDM, NBR, polytetrafluoroethylene, etc. These materials have their own characteristics, such as heat resistance, wear resistance, corrosion resistance, etc.
When selecting the material of a butterfly valve, in addition to considering factors such as the corrosiveness of the medium, temperature, and pressure, the service life and sealing performance of the valve must also be considered. Therefore, the specific material to be selected should be comprehensively judged based on actual working conditions and needs. In short, the material selection of a butterfly valve is a complex and important process that requires full consideration of various factors to ensure the performance and service life of the valve.
