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Seal Rings

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Sliding ring seals (which are dynamic seals) seal rotating shafts under pressure with a wall (e.g. machine housing). They are used for sealing liquids. The main components are two parts that move against each other, the seal ring and counter ring. These are pressed radially against each other by a spring. One of the two rings is always fixed in the stationary part (house), with the other moving on the rotating shaft. A very small sealing gap (approx. 1 µm) forms due to hydrostatic or hydrodynamic effects between the two rings. The running surfaces between both parts are ground and polished smooth to optimise efficiency. The rings in modern sliding ring seals are generally made of carbon materials, graphite materials or ceramics. Metals and polymers are also used. The adaptation of the materials in the seal ring and counter ring to suit each other is of decisive importance.

The main application areas for sliding ring seals are pumps for process water, drinking water, automobile radiators or air conditioning systems, agitators for wet and dry running and centrifuges or water turbines. They are also used in process pumps in the chemical and petrochemical industry or power station pumps. Ring seals are available today for shaft diameters from approx. 5 to 630 mm, pressures from approx. 0.01 to 200 bar, temperatures from approx. -200 to +450 °C and sliding speeds of up to approx. 150 m/s.

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