The upper and lower Belleville springs press both sides of the stem seal together to achieve a TA-Luft/VDI 2440 certified stem seal.

An artificial rubber backup liner behind the lining ensures a tight fit of the disc, thus achieving an airtight seal.

The lining provides a wide flange sealing surface.

Thin piece valve stem with 3 mm PFA lining provides high Kv values.

The lining and valve plate are the only two valve parts that come into contact with the medium.

Preload contact between disc and lining hub provides shaft sealing capability.

The stem diameter is expanded against the stem aperture on the lining to provide two-stem sealing capability.

The linings and valve plates are molded and machined to a small tolerance, allowing them to:

Low torque

Less stress and less deformation during opening and closing.

The helium filled vacuum test had a pressure of less than 20 pa (0.2 mbarA).

Optional TFM lining suitable for demanding applications.

Integrated body positioning hole ensures valve alignment.

Actuator flanges and stem dimensions conform to ISO 5211.