rotary shaft seals

Rotary shaft seals are used to seal rotating machine components. They consist of a rubber part with a reinforcement plate and a worm spring made of spring steel. They are available in NBR and FKM which are suitable for different running speeds. NBR is suitable for speeds of up to 14 m/s, while FKM is suitable up to 37 m/s. Three basic types are available based on their intended use: A, B, and C.

• A (commonly used market designations: BA, (TR)A, CB, 827N, DG, SC, WA): Suitable for sealing low-viscosity or gaseous media. Bridges the gap between thermal expansion and a high degree of roughness in the housing hole. No corrosion caused by frictional corrosion.
• AS (commonly used market designations: BA SL, (TR)E, CC, 827S, DGS, TC, WAS): Design A with an additional dust lip against dirt and risk of corrosion.
• B (commonly used market designations: B1, (TR)C, BB, 822N, DF, SB, WB): These have a metallic housing which is pressed in slightly during installation. It requires narrower tolerances of the housing hole, to ensure even sealing at the outer casing.
• BS (commonly used market designations: B1 SL, (TR)D, BC, 822S, DFS, TB, WBS): Design B with an additional dust lip against dirt and risk of corrosion.
• C (commonly used market designations: B2, (TR)B, DB, 824N, DFK, SA, WC): These have a metallic housing with reinforcing cap. Sealing and assembly are the same as design B. Suitable for harsh operating conditions and for larger dimensions. Less sensitive to assembly errors thanks to the reinforcing cap.
• CS (commonly used market designations: B2 SL, (TR)F, DC, 824S, DFSK, TA, WCS): Design C with an additional dust lip against dirt and risk of corrosion.
• AD / BD The designs AD or BD are equipped with two sealing lips. These are used to seal and separate two media.