• General Applications at dead end pipe.
• Ring shape bolt hole for bolting with flange.
• Keep pressure inside during repairing adjacent one side pipe.
• Different flange shape.
• Possible damage on full face gasket.
• Hard repairing corroded bolt.
• More man-hour for installation.
• Heavy weight.

It effects friction-free contact between body and seat since the rotation axis(stem) of the valve disc is shifted from the center by a distance of the width of A and B, a cam effect is produced which prevents from wearing the seal surface, lessens seating torque and offers longer service life and easy operation.