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Piston seals incorporating anti-extrusion rings

These SKF piston seals incorporate patented locking anti-extrusion rings made of polyamide (PA). They are split for easy installation. Their snap-in design makes it easy to identify the correct installation direction (fig. 1), holds them in place when installed and prevents damage during assembly.

Piston seals incorporating anti-extrusion rings have an improved high pressure performance and minimize the risk of gap extrusion at abrupt pressure peaks (→ Gap extrusion).

LCP profiles

LCP (fig. 2) profiles have a PTFE slide ring supported by harder PA anti-extrusion rings (fig. 1) and a T-shaped nitrile rubber (NBR) energizer. These capped T-seals are suitable for pressures up to 690 bar (10 000 psi) and available in metric (→ Size list [pdf]) and inch sizes (→ Size list [pdf]). Some metric sizes fit seal housings in accordance with ISO 5597:2010. For additional information, refer to LCP profile data.

LTP profiles

LTP profiles (fig. 3) have a nitrile rubber (NBR) sealing ring supported by harder PA antiextrusion rings on both sides. These T-seals are suitable for pressures up to 345 bar (5 000 psi) in medium to heavy duty applications and are available in inch sizes (→ Size list [pdf]) where O-ring dash-number housings are used. For additional information, refer to LTP profile data.
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