FAQ Seals

The following section contains answers to frequently asked questions about seals.

If you have questions that are not answered here, feel free to send us an inquiry.


Questions about seals

Does the seal work against pressure differences or gaseous substances?

No, pressures can only be reduced, not sealed.

Does the seal work against occurring liquids?

No, any liquids which accumulate simply flow through the gap. This makes it important to ensure that liquid cannot build up in front of the seal.

Is air lock advisable?

To a certain extent: Air lock improves the effectiveness of the sealing, but the air consumption is relatively high. The supplied air current is also relieved evenly on both sides of the seal. If there is a bearing position right next to the seal, there is a risk of the lubricant being blown out (in the case of oil) or drying out (in the case of grease).

Is it advisable to use a centrifugal disk?

Yes, centrifugal disks improve the sealing effect, particularly at low speeds. It is therefore advisable to use a centrifugal disk to protect the gap seal.

How effective is the seal against dust, sand and abrasive substances?

A greased gap seal is recommended here. The resulting grease pad provides relatively reliable sealing against dust particles. The model is equipped for all gap seals from the series “S”.
A small bead of grease forms on the labyrinth inlet during operation, where the majority of the dust sticks.

Can the sealing effect be improved with a tandem arrangement (2 seals next to each other)?

This is the optimal solution, but also the most complicated one.
A sufficiently large gap of at least 5 mm is required between the 2 seals, along with a suitable drain hole.
In case of dust, grease pads can be inserted between the 2 seals.

Is it possible to seal against (oil) mist or finely sprayed liquids?

Only with the help of air lock.