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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | PV Value | | | | | | | | | | ( Media Pressure in MPa X Surface Velocity in m/s) | | | | | | | | | | The PV value of a compound is the product of the unit load P (MPa) on the projected area and the surface velocity V (m/s). Intermittent service, reciprocating motion, cooling and design innovations permit PTFE compounds to operate at much higher PV values than the limit established using continuous rotary motion. The max PV or limiting PV is reached when the temperature generated by the friction escalates. | | As stated before, cooling and lowering the coefficient of friction by means of lubrication can increase the limiting PV. Since so many application parameters have an impact on the max. or limiting PV, each application should be performance-tested to verify the industrial seal life and other seal related properties. | | | | | | | | | | | | | | Typical Limiting PV Chart | | | | | | | | | | 0,80 0,70 0,60 0,50 0,40 0,30 0,20 | | | | | | a. Ul Ul a. | | | | | | | | | | | | | | 0,10--0,00 "I-1-1-1- 0,0 5,0 10,0 15,0 20,0 Speed in m/s | | | | | | | | | | 7 | | | | | | www.OmniLip.com | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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