According to the driving method: electric butterfly valve, pneumatic butterfly valve, hydraulic butterfly valve, manual butterfly valve.
According to the type of structure: central sealing butterfly valve, single eccentric sealing butterfly valve, double eccentric sealing butterfly valve, triple eccentric sealing butterfly valve.
According to the materials of the sealing surface: soft sealing butterfly valve, metal hard sealing butterfly valve.
According to the type of sealing: flexible sealing butterfly valve, plus torque sealing butterfly valve, stamped sealing butterfly valve, automatic sealing butterfly valve.

According to the working pressure: vacuum butterfly valve, low pressure butterfly valve.
According to the working temperature: high temperature (butterfly valves with t>405°C), mid-temperature butterfly valve.

Above are the common types of flanged sanitary butterfly valves. Although flanged butterfly valve is small and lightweight, easy to dissemble and maintain, installable at any positions, different types and different sizes of flanged butterfly valves have different issues to take notice of.