▪ Rounded polished disk guarantees the concentricity of disk and seat. This results in low torque, good sealing and long service life. ▪ Replaceable seat design with low cost of maintenance. ▪ Two-stage sealing design effectively prevents the medium from leaking. Primary seal is provided by preloaded contact between flatted seat surface and rounded polished disc-hub area. Secondary seal is formed by the interference fit of seat/shaft/hub.

▪ Top built-in bearing provides the best support, reduces the friction and lengthens the service life. ▪ Self-adjustable dual-V gland packing, with the automatic compensation and the two-way sealing characteristics, prevents the objects passing through the stem into the body. ▪ Molded-in O-ring provides positive flange sealing and eliminates the requirement of gaskets. Equipped with positioning hole, for convenient installation and centering  the flanges. ▪ ISO 5211 top mounting plate available, for easy actuation. ▪ Optional: actuator