Close this search box.

Seals for rotating shafts


Seals for rotating shafts


The shaft seal type SDK40 is a labyrinth seal system with non split housings and radial adjustable sealing rings. Compared to a rigid lip seal, the SDK40 is significantly more efficient, especially with supercritical rotors.
The shaft seal SDK40 is a non-lubricated system for dry-running applications.


The sealing rings of the STASSKOL DynamicSeal SDK40 have a 3-part design with radial cut and are held together by a tension spring. The sealing rings are floating on the turbulent and high-energy gas flow without having contact to the shaft. However, at start-up and shut-down the shaft can be in contact with the sealing elements especially at critical rotation speeds.


The shaft seal type SDK40 is used in order to seal technical gases, dust and vapour mainly in tubines, compressors and other high pressure devices with sub- and overcritical rotors.
Use of the SDK80 can reduce leakage rates by up to 90%. The technical design of this sealing system is subject to meticulous information about the operating conditions and about the characteristic data of materials.

We are happy to give advice!

  • Chemical industry

    Gear compressors

  • Refineries

    Rotary screw compressors

  • Gas

    Steam turbines

Type overview

The SDK40 can be offered with buffer lubricant, buffer gas, suction drain or without connections.
There are no special feature in dimensions for the shaft seal SDK40 compared to the other shaft seals.

For more information please press the dowload button.

Customer Feedback

Extract from our customer survey “Global Brand Survey 10/2021
in order processing
of delivery
Customer Satisfaction
100 years STASSKOL

We are happy to advise you

For technical and commercial enquiries, the staff of STASSKOL GmbH will of course be happy to assist you.
Julian Große-Segerath

Julian Große-Segerath

Germany, Austria, Switzerland

  • High-Performance Polymers


Wir beraten Sie gern bei der Auswahl des optimalen Hochleistungskunststoffes für Ihre spezielle Anwendung.