High Performance Butterfly Valve
The high-performance butterfly valve has excellent sealing properties and a tight shut-off. The disk is an off-centre portion of a ball, and the seating function of this valve is identical to that of a ball valve. The disk and seats of the valve are offset from the shaft axis and it is not necessary to seal the shaft in this valve. Many valves have a main seat made of durable plastic and a secondary metal seal making them “fire-safe.” High-performance butterfly valves are produced in pressure groups as high as ANSI 900 and could be used in applications involving a tight shut-off.
How does a high-performance butterfly valve Work?
In High-performance butterfly valves, the sealing may be provided by an interference-fit seat or a line-energized seat configuration, where the fluid pressure inside the pipe helps in boosting the interference between the seat and the outer part of the disk. Frequently utilized seat materials are polytetrafluoroethylene (PTFE) or reinforced PTFE (RTFE) due to a greater performance and temperature range.
Metal seats are also available in high-performance butterfly valves. These metal seats allow the use of a butterfly valve at a much higher temperature. Fire-safe versions are also offered that provides the shut-off of the valve just before the fire, and the metal seal guarantees the closure of the valve during and after the fire.
