Conveyor drive roller with pressure relief means

A conveyor drive roller for a conveyor system, said conveyor drive roller comprising:

• a hollow drum rotatably connected to a first stationary shaft and a second stationary shaft, said hollow drum defining a sealed chamber;
• said sealed chamber at least partially enclosing means to rotate said hollow drum about said first and second stationary shafts;
• a pressure relief valve positioned on said conveyor drive roller in fluid communication with said inside of said sealed chamber, and configured to reduce a gas pressure of a gas inside of said sealed chamber caused by a rise in a temperature of said conveyor drive roller during operation;
• and
• a conduit extending from said inside of said sealed chamber to outside of said sealed chamber, said conduit defining an internal portion located in said inside of said sealed chamber, and an external portion located in said outside of said sealed chamber, said external portion being sealed from said outside of said sealed chamber;
• wherein:
• said internal portion of said conduit defines an opening in fluid communication with said inside of said sealed chamber;
• and
• said pressure relief means is sealingly connected to said external portion of said conduit.