Double Offset Butterfly Valve
BUTTERFLY VALVE DOUBLE OFFSET SERIES
MANUAL AND AUTOMATED
ASME/ANSI CLASS 150 AND 300
High Performance Double Offset Butterfly Valve is ideally suited for on-off and
regulating control of gas and liquid media. The valves provide a bi-directional
bubble-tight shutoff (zero leakage), high flow capacity, and long service life.
Double offset design:
The double offset butterfly valve has a double-disc/stem design.
1. The shaft is offset from its disc centerline: this offset will make the valve has a continuous sealing surface on the disc when its’ fully closed.
2. The shaft deviates from the centerline of the pipeline: this deviation will make the valve disc not touch the valve seat at all in the fully open position.
This double eccentric design produces a can-like effect when the disc swings in and out of the seat. The disc is immediately pulled out of the seat, which eliminates the sharp corners on the top and bottom of the seat. Eliminating friction can increase seat life, thereby reducing operating torque and improving throttling.