How many general types of butterfly valves are there?

There are two general types of butterfly valves: the resilient seated butterfly valve and the metal seated butterfly valve. The resilient seated butterfly valve features a flexible seat that allows for a tight seal and is commonly used in applications where the flow is fully on or off, such as in water or wastewater management systems. In contrast, the metal seated butterfly valve is designed to withstand higher temperatures and pressures, making it suitable for industrial applications. Understanding these types helps in selecting the appropriate valve based on the specific needs of a piping system, considering factors like the media being handled, pressure requirements, and whether a tight seal is necessary. This distinction between the two types exemplifies the importance of selecting the correct valve type for highly efficient and effective system operation.