I have some questions about triple offset butterfly valve.Could somebody pls confirm if my understanding below are correct or be kind enough to correct me if I'm wrong?(1) When valve is under good condition (nothing is broken), the disc can only turn 90deg (max) from fully closed to fully opened.(2) Under good condition, can the disc turn freely up to 180deg from fully closed position? Can it turn 360deg freely? (3) What stop the disc from turning more than it should be? Is there some sort of device for that function?(4) Under what kind of failure will cause the disc turning freely?Triple offsets are quite different from double offsets & centered, in answer to your points.1) Triple offsets are torque seated, not position seated, hence the disc can rotate from fully open to fully closed + 4 or 5