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Schrader Valve on Telephone Conduit?


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#1 systems_glitch

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Posted 03 September 2013 - 11:47 AM

I've noticed what appears to be Schrader (tire) valves on a number of telephone system conduits in our area. I finally remembered to take the camera with me and grab a picture:

 

Attached File  telephone_valve.jpg   105.1KB   14 downloads

 

Any idea what this is for?!



#2 dmine45

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Posted 03 September 2013 - 05:48 PM

Sometimes phone lines were compressed either with dry air or nitrogen to keep the copper wires on long trunk lines from oxidizing.



#3 systems_glitch

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Posted 04 September 2013 - 09:09 AM

Interesting! I'd seen grease fittings on large conduits before, which were then filled with grease to keep water/air/whatever out. Having worked with grease-filled cables, I'd imagine the air/nitrogen approach is a lot nicer to maintain.



#4 Y0ungBra1n

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Posted 05 September 2013 - 12:53 PM

I've also heard that conduits will be compressed with air to detect cuts and breaks so servicemen know exactly on what haul segment the leak is located.






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