How Pneumatic Seals / Inflatable Seals Work

An inflatable seal, also known as a pneumatic seal, is a fabric-reinforced hollow elastomeric tube designed to form a liquid or airtight barrier between a mounting and a striking surface. Depending on the application, they can be molded in a concave, convoluted, or flat configuration.

Inflatable seals introduce a pressurized medium from an external source into the cavity of the hollow seal. This inflation pressure causes the seal to displace in three primary directions: axial, radial in, and radial out.

Once fully inflated, the tubing forms a positive seal between the mounting and striking surfaces. When the inflation pressure is removed, the seal deflates and retracts to its original “memorized” configuration, allowing free relative movement between surfaces.

The most common medium used to inflate seals is air, but some applications may also use various gases, liquids, or gels. The inflation medium is usually administered to the seal via a fitted flexible hose or tubing system.

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