Lip seal TDI series

lip seal
lip seal
lip seal
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polyurethane, PTFE
rod, piston
Temperature limit

Min.: -35 °C (-31 °F)

Max.: 100 °C (212 °F)

Pressure limit

450 bar (6,527 psi)


Min.: 20 mm (1 in)

Max.: 499 mm (20 in)


The Hunger TDI tandem seal for inside sealing is a piston rod seal. It can be used with mineral oils and in modifi ed form with water base fl uids, fi re resistant fl uids and compressed air. The TDI seal consists of 2 parts, an external elastic ring of PUR with a sealing lip and an internal slide ring of abrasion resistant PTFE-Bronze compound with a sealing edge. Prior to fi tting, the sealing lip protrudes beyond the nominal diameter of the seal and when fi tted is pressed against the piston rod. Effective sealing is thereby provided at zero pressure. The slide ring is surrounded by the elastic ring and seals axially in direct contact with the piston rod. Under increasing pressure and compression of the sealing ring, it is the slide ring which is predominantly pressed against the piston rod. The slide ring produces an annular cavity where any seepage oil that has passed the elastomer lip is collected. The seepage cul is held back by the sealig edge such that the emerging piston rod romains dry Di.nng the retum stroke. the cdected oél is lorced back into the cylinder The internai sealng surface ot the seal pnmahly comprises the internai skde ring wtùch possoss excellent sldng propeiîies When combeied wth a surface foish o»R„0.1 0.3 pm on tho piston rod. minimum friction levels are acheved with hlghty efficient sealng and long service life There is no stiction. no unacceptable heat geoeraton and above ali no stck-slip eftect


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