Soft Seated Butterfly valves Series 30

The Series 30 soft-seated wafer butterfly valve allows easy disassembly and reliability between the discs and stem connection. The stem is secured to the body with a special stainless steel circlip, a thrust disc and two C-rings. These are made of brass as standard, but can also be made of stainless steel on request. The circlip can be easily removed with a standard hand tool. The stem lock prevents unintentional removal of the stem during operation. The design of the stem seal with double U-profile seal is self-adjusting and offers positive sealing properties in both directions. The extended neck provides 50mm pipe insulation and is easily accessible for direct mounting of actuators. The butterfly disc and sealing face are spherically milled and hand polished to provide a blister tight seal, minimum torque and longer seat life. The one-piece body is available as an intermediate flange or flanged fitting. The polyester coating provides excellent corrosion protection. Nylon coatings are also available as an option. The double seal ensures that the operating media does not come into contact with the housing or shaft. The primary seal is obtained by a press fit between the disc and the seat ring. The secondary seal is also a press fit as the stem diameter is larger than the stem bore diameter in the seat ring.

Technical data


Body: spheroidal graphite iron, grey cast iron, cast steel

Disc: Nylon-coated spheroidal graphite iron, aluminium bronze, stainless steel, Hastelloy, Hatar-coated spheroidal graphite iron

Cuff: BUNA-N, EPDM, FKM, Polyurethane


Soft-sealing butterfly valve for installation between flanges according to DIN.

Nominal size:

DN50 - DN500

Nominal pressure:

Max. 12 bar (DN50 - DN300)

Max. 10 bar (DN350 - DN500)


-29°C up to 204°C


Optional versions are possible.

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