double offset Butterfly Valve

double offset Butterfly Valve

Double offset butterfly valve is also known as high-performance butterfly valves. It means that the shaft of the double offset butterfly valve is both mounted slightly offset from the pipe centerline and mounted behind the sealing band of the seat.  Since the disc is designed to be offset from the shaft, there is a lot of metal in the flow stream in the wide-open position. Therefore, the double offset butterfly valves are able to have somewhat less maximum capacity than that of the flat-disc or non-offset butterfly valves.

And it is true that there is a variety of the available types of the double offset butterfly valves, including the wafer, lugged, flanged and butt weld ends and so on. No matter what, the design and manufacturing of the double offset butterfly valves should be under the regulation of several accepted standards.

Typically speaking, the double offset butterfly valves are self-closing due to dynamic torque. That have reduced breakout torque as well as reduced dynamic torque during the whole operation. Double offset butterfly valves are able to provide excellent controllability, bubble tight shut off, greater seat life and smooth operation. As a result, they can be widely used in chemical, petroleum, hydrocarbons processing and pulp & paper industries.