Relief Valve on EXP Enclosure

fifty60

Senior Member
Location
USA
I have an explosion proof enclosure with a relief valve located on top. Why would this enclosure have a relief valve?
 

fifty60

Senior Member
Location
USA
It looks like a valve, I believe it is called a "drain and breather", the one I am referring to is on top so it is a breather. These do not compromise the ability to contain an explosion?
 

rbalex

Moderator
Staff member
This is a typical manufacturer's application diagram.

They do practically guarantee that flammable gases/vapors will enter an explosionproof enclosure. Then again, the flammable gases/vapors will enter through any threaded connection anyway, with or without a drain/breather, which is why I usually avoid them.

That said, a drain/breather identified for Class I does not usually "compromise" the enclosure. The exception is salt-air applications where residue build up may (only may) defeat the spring. Personally, I've never had that happen.
 
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