Yes, Triple Offset Butterfly valves can be used for isolation. Triple Offset is a great alternative to the block valve incumbents like gate. If gate was not applicable to process conditions ball valves were utilized.
Triple Offset Butterfly valves have the following but not limited to advantages in this application; Cost effective, Ease of operation & more readily available than other valve offering.
Check out our Triple offset page and contact us further so we can assist you to identify the best solution for your valve needs.