LPV Test results

The graphs below compare SKF’s LPV piston seal with the double acting light duty piston seal of a leading competitor. The test results show, that the LPV piston seal has a very low leakage rate, less slide ring extrusion and additionally lower friction, which increases the life time of the whole sealing system.
The compression set chart shows the compression set behaviour of LPV piston seals made of two different TPU glide ring materials. It clearly shows the excellent performance of the newly developed piston seal material ECOPUR PT 54D, which outperforms seals made of a commercially available TPU grade on compression set resistance properties, which is one of the key characteristics of a seal. It is responsible that the seal functions properly, minimizing the risk of blow-by during its total service life.

Leakage

LPV Leakage test results
Leakage
The leakage level for the LPV piston seal is lower than the leakage of the tested competitor seal. The test results show that adapting the sealing material and the seal geometry is the key for best sealing performance.

Extrusion length

LPV Extrusion Length test results
Extrusion length
Apart from the compression set behaviour, the extrusion performance is a good indicator for the suitability of the sealing material. Test results underline the high quality of ECOPUR PT 54D, which out performs competitor's materials on extrusion length.

Friction force

LPV Friction Force test results
Friction force
The frictional force of a competitor seal is nearly on the same level as for the LPV piston seal, but just because of a thicker lubrication film, which results in more leakage.

Compression set

LPV Compression Set test results
Compression set
The very low compression set of ECOPUR PT 54D increases the seal lifetime, because of lower preload loss. The graph underlines that the material performs well when proper care is taken in the selection of the sealing material and seal geometry.
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