Chesterton PLS Polymer Labyrinth Seal

The Chesterton PLS Polymer Labyrinth Seal is a non-contacting seal that provides bearing protection for pumps, gearboxes and rotating equipment in splash applications. The design minimizes fretting caused by conventional lip seals and extends the mean time between equipment repairs, increasing bearing and gearbox life.

The labyrinth seal uses polymer to create a non-contacting three piece seal design that consists of a rotor, stator, and built-in valve with no wearing parts. While in operation, centrifugal force and gravity help ensure lubricant is contained within the labyrinth and flows back into the bearing housing while outside contaminants are excluded and redirected back to atmosphere.

An incorporated built-in valve is activated by shaft rotation which engages during shutdown periods to create a positive seal during idle time, blocking ingress of external contaminants from entering the housing.