For oil and grease retention, no pressure or very low pressure up to 3psi (0.2bar)*
The primary function of oil seals, grease seals and bearing seals is to retain the bearing lubricant and, secondarily, to enhance the performance and life of the bearing by minimizing dirt, oil and water ingress that results in damage and premature failure of the bearing and other components. …More Info
Oil seals have a garter spring to provide a constant, uniform load of the seal lip on the rotating shaft. A spring-energized lip is required for best oil retention, but not typically for grease retention. Oil seals are widely used as bearing seals and as rotary shaft seals for fast rotary motion under no or very low pressures (max. 7 psi/0.5bar pressure spikes)*. Most oil, grease, and bearing seals with elastomeric seal lips are designed for zero pressure but will provide adequate service up to 3psi (0.2bar). Higher pressures will push the lip against the shaft and cause excessive friction and wear and rapid failure of the seal.For continuous pressures above 3psi (0.2bar), see High- and Medium-Pressure Rotary Seals.
The PV-Rating of an AHPSeal rotary seal gives an indication of the seal’s ability to withstand the stress applied to a seal due to sealing pressure as the shaft rotates with velocity. The higher the PV-Rating is, the higher the seal’s ability is to handle a higher combination of pressure and rotational velocity, with 10 being the highest. This is to only be used as a guide for lubricated operating conditions to narrow down possible sealing products.
Seals can not be operated at their upper pressure and speed rating at the same time!
Please contact one of our experienced seal engineers to select the best seal for your application.
PV-Rating Calculator:Shaft Diameter
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