In wafer butterfly valves are placed between two pipe flanges, which are linked by long bolts across the valve body. The valve body may or may not have flange holes outside the valve body. O-rings and gaskets that are mounted in a flat valve face are placed on both sides between the valve body and the pipe flange to achieve a strong seal.
Wafer butterfly valves are known for their cost-effective connection design but are not suitable for isolation purposes or end-of-line applications. Maintenance on either side of the wafer butterfly valve requires a complete shutdown of the entire pipeline.
Wafer butterfly valves, like some other types of butterfly valves, are not recommended for high-temperature applications. The valve body can expand with heat, leading to increased stress on the valve bolts and potential failure.
Features of this type of butterfly valve is as following:
-construction: Thin body, single flange
– Installation: between two flanges
– sealing: single elastomeric seat
– pressure rating: vacuum to 16 bars
– Temperature range: -20 to 130°c
– Applications: HVAC, Water system
– Advantages: light weight, compact
– Disadvantages: Limited sealing