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The best-known application for slotted oil scraper rings is as the bottom ring of the three types on a piston within a combustion engine. This type of piston ring ensures the same distribution of oil over the cylinder wall and the removal of the excess oil to the crankcase through the recesses in the ring.

The piston also has channels through which this oil can flow back to the crankcase. Another part of the oil is scraped back through the cylinder wall. The classic version is a single piston ring with or without tension ring.

Nowadays, the three-piece piston rings are often used in which a central inner ring presses two narrower piston rings, in place and with tension, against the cylinder wall. We also refer to this type as Niflex rings. The narrow working rings in this system are made of steel and provided with a hard chrome or nitride coating after treatment.

Materials used include:
– Lamellar and nodular cast iron
– Various steel grades

Standards:
– NEN ISO 6627: 2000
– NEN ISO 6625: 1986

Niflex piston ring

Special surface layers:
– Hard chrome
– Bath and plasma nitriding
– PVD layers
– DLC layers

Type E301 Type E301
Slotted oil scraper ring with narrow oil grooves.
Type E302 Type E302
Slotted oil scraper ring with wide oil grooves.
Type E303 Type E303
Slotted oil scraper ring with wide oil grooves & rounded slots.
Type E304 Type E304
Slotted oil scraper ring with tapered oil grooves.
Type E305 Type E305
Wide stepped slotted oil scraper ring.
Type E306 Type E306
Double bevelled oil scraper ring.
Type E307 Type E307
Double bevelled oil scraper ring with scraping grooves.
Type E308 Type E308
Roof bevelled slotted oil scraper ring.
Type E309 Type E309
Bevelled oil scraper ring with expander spring.
Type E310 Type E310
Slotted oil scraper ring with offset runnig face.
Type E311 Type E311
Double slotted oil scraper ring.
Type E312 Type E312
Offset oil scraper ring with wide oil groove.
Type E313 Type E313
Slotted oil scraper ring with wide oil grooves & expander spring.

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