New Stopper Device
Japan Patent No1769954(40-300mm)
An original design with a spherical inner surface of the body contacting to spherical ends of the disc hub allows its self-alignment. This design ensures prevention of over-run of the disc.

(350-600mm) A spacer ring is provided between each end of the disc hub and the inner surface of the body for self-alignment of the disc. The over-run of the disc is prevented by a protrusion on the inner surface of the body.

Disc with thin but highly stiff rib
(40-300mm) The disc has a thin, but highly stiff rib.
(350-600mm) The rib of disc has a convex figuration like an end plate of a tank. Either design has successfully reduced thermal expansion and shows a constant sealing capability against changes in temperature or pressure of fluid.

Double Eccentric Structure
When the disc rotates, it unseats at a small open angle, by its cam effect. It prevents seat abrasion and provides perfect shut-off for a long period.

Seal the flow from both directions
The valve can seal in reverse flow as well as the preferred direction, and cope with the flow direction changes. The ball lock method is adopted to facilitate the easy replacement of the seat ring. Metal seat and Teflon seat are both quickly replaceable.