Description & Advantages

The NS-94 TDI tandem seal for inside sealing is a piston rod seal. It can be used with mineral oils and in modified form with after base fluids, fire resistant fluids 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 fitting, the sealing lip protrudes beyond the nominal diameter of the seal and when fitted 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 oil is held back by the sealing edge such that the emerging piston rod remains  dry. During the return stroke, the collected oil is forced back into the cylinder. 

Technical Data

Operating Conditions

Pressure                 :  450 Bar

Temperature         :  -35°C ~+ 100°C

Sliding Speed        :  ≤ 1.0 m/s

Media                    :  Hydraulic oils (Mineral oil-based)

Material

Material                 :  PU+PTFE - BRONZE/ CARBON/ MOS2/ GRAPHITE

Hardness               :  90-95 Shore A

Color                      :  Novelty Blue