Copeland China recipr.compr. Is it a bypass pipe?

Hello eberybody!

Does anyone know what this bypass /or safety pipe is with the valve?

Attachment 15250

NEugeny,
Check page 12 internal relief valve.
Does it look similar?

http://www2.renkulde.no/mkdokume.nsf/C8646D22130D5CA9C1256D90002D58C1/$FILE/EN_D060302_AGL_SHDiscus.pdf

Thank you.
On one unit during operation this pipe is hot, on the second one it is cold.
Where the pipe is hot, there is a strong vibration.

Update:
I dismantled this node, there is nothing inside the pipe.
It connects the cavity of the suction in the head and the crankcase.
During operation, the temperature of the tube is about + 50 ° C

We will consider that this is such a specific oil separator. ;-)

Quote:

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Originally Posted by NEugeny

We will consider that this is such a specific oil separator. ;-)

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NEugeny,
Any chance of exact model number so can search for answers?

Attachment 15262
this is made in china

Possibly this is a hot gas by pass to work compressor at low loads (unload) you can verify with monitoring gauge pressure and pipe temperature.