Triple-offset Butterfly Valves are designed in accordance with key international standards. They also meet the requirements of major oil & gas and power industry standards/ customer specifications.
|Design||API 609 (Category B),
|Ends||Wafer/ Wafer Lugged||Face-to-face||API 609|
|End Flange Dimensions||ASME B16.5|
|Flanged||Face-to-face||API 609/ ISO 5752 Ser. 13/
Ser. 14/ Ser. 8
|End Flange Dimensions||ASME B16.5/ ASME B16.47|
|End Dimensions||ASME B16.25|
|Pressure – Temperature Rating||ASME B16.34|
Triple – Offset Geometry
In Triple-offset Butterfly Valves, the shaft is offset from the sealing surface and body centreline. Further the sealing cone is rotated away from the bore centreline to create a third offset.
The triple-offset geometry ensures that the body and disc come into contact only at the final shut-off position. This eliminates wear and tear due to interference, reduces operating torque and enhances product life.
Triple – Offset Sealing System
|Offset #1:|| The Shaft is Offset from the seat plane providing an uninterrupted
|Offset #2:||Centerline of disc is Offset from the centerline of the shaft
allowing the seal to freely lift off and away from the seat on
|Offset #3:||The cone axis is Offset from the centerline of the seal to provide a
conical sealing surface that allows the seal to rotate in and out of
the seat without interference.