Tianjin Tianfei High-Tech Valve Co.,Ltd.
Types of Butterfly Valves

Plastic Butterfly Valves
Plastic butterfly valves are available in two types or styles, wafer and lug. A different installation procedure is used for each one.
Wafer Style Valves
Wafer style is the more common of the two and is less expensive than the lug style. The wafer style butterfly valve is just about the standard. It ís so common that no one even bothers to use the word "wafer" when ordering a butterfly valve. They take it for granted that if they order a butterfly valve, they will get a wafer style one.
Wafer Butterfly Valves
Wafer butterfly valves are installed between two flanges using bolts or studs and nuts. This type of installation, of course, makes it impossible to disconnect just one side of the piping system from the valve. That is where the lug style valve comes in.
Lug Style Valves
Lug style valves have metal inserts installed in the valve's bolt holes. These inserts are threaded on both ends. This allows them to be installed into a system using two sets of bolts and NO nuts. The valve is installed between two flanges using a separate set of bolts for each flange. This setup permits either side of the piping system to be disconnected without distributing the other side.
Lug Style Butterfly Valves
Lug style butterfly valves used in dead end service generally have a reduced pressure rating.

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