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English caption.

Pneumatic seals are any of a class of seals used in applications including rotary or reciprocating motions. They are often used in pneumatic cylinders and valves, but do not work well under high pressure.
This type of seal requires minimal lubrication when exposed to air in order to create a tight seal. Pneumatic seals may also be exposed to high operating speeds at which the pressure is not high. Piston seals, rod seals, flange packings, u-cups, and vee-cups are a few designs of this type. The difference between pneumatic and hydraulic seals is pressure. Pneumatic seals typically have a pressure range of 1 to 150 pound-force per square inch (psi) (about 6.89 to 1,034.2 kilopascals), while hydraulic pressure can reach greater than 10,000 psi (68.9 megapascals).

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