Rounded polished disk guarantees the concentricity of disk and seat. This results in low torque, good sealing and long service life.

Replaceable seat design reduces maintenance cost

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 friction and lengthens the service life

Self-adjustable dual-V gland packing, with the automatic compensation and the two-way sealing characteristics, ensures that objects cannot pass through the stem into the body

Molded-in O-ring provides positive flange sealing and eliminates the need for gaskets. With positioning hole, for convenient installation and centering between the flanges

ISO 5211 top mounting plate available, for easy actuation