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Non-contact vs contact seals


 
   
wear no yes → due to friction
power loss no → energy saving, possibility to use smaller drive units yes → due to friction loss
speed limit yes → but very high yes → depending on material
life-time limited no yes → due to wear
lubrication no yes → desired or necessary
mating parts hardened and ground no yes → shaft, for wear reduction
working temperature high → due to the metallic material steel and alu (170 °C) low → due to rubber and plastic material
mounting space small, due to GMN Labyrinth small
application:
  • grease lubrication
 

yes

 

yes

  • oil lubrication
yes → if the oil sump is below the sealing gap; oil mist lubrication preferred; yes
  • water
yes → when using rust resistant materials; water level must be below the sealing gap; limited → because water is inapplicable for lubricating the lip seals and it increases wear
  • fine- and coarse grained contamination
yes no → lip seals are stepwise destroyed due to increased wear
increasing temperature no yes → see diagram

 

 Increasing temperature at rotation speed n=1000 rpm

 

 

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Chicago
Booth N-7175 (GMN USA)

 

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September, 18-22,
Stuttgart
Hall 4, Booth 4C71

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Special solution against high splashing liquids > GMN Tandem Labyrinth Seal

Tandem_Seal

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