Step seal. Piston & Rod configurations

Used alone, in pairs, or in conjunction with another sealing element, step seals buffer the primary seal from pressure spikes. Typically a PTFE based seal lip is energized against the dynamic surface using an o-ring. Profile shape allows back-pumping of intermediate fluid to avoid pressure traps.

Specs

Pressure [High]

Dynamic Service Speed [High]

Seal Directionality [Unidirectional]

Manufacturing Method [Combination]

Common modifications custom combinations energizer and cap materials

Catalog Standards n/a varies by OEM

Customizable Yes

Comparative cost: $$

Special Applications

Used alone or in series with other elements. In series, buffers primary seal from pressure spikes allowing some leakage, extends lifetime and operating pressure of primay seal. Excellent dynamic friction modification.

More Information

Often overlooked, this seal can be a game changer.

Sometimes referred to as buffer seal this is a small dimension seal element which can be a very effective addition to the overall seal stack to produce a long-life dry seal. The thermoplastic element is shaped to facilitate effective back pumping to avoid pressure traps. The thermoplastic element (shown as ID element in image) is typically a filled PTFE to minimize wear and cold flow.

Fun fact - 2 seals in 1!

Over time the thermoplastic lip profile can wear flat, at which point this seal functions as a cap seal!