PRV blowing...

by Christian
(Oxford, UK)

I have a 3hp single phase Charnwood 106 compressor for painting a car I'm working on - little used (off eBay). Unfortunately the PRV blows when the pressure enters the 'red'. The pressure switch has only operated once out of the 10 times I've used it so I assume this is where the problem is? I'm a compressor novice so am not sure where the pressure switch is - can it be fixed? I'm pretty good at DIY - I think spares are still available... Thanks

This is the link to page which has the spec for my compressor - http://www.charnwood.net/ProductDesc.jsp?cat=29&stockref=C106

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Bill says...

Hi Christian:

Yes, you want to replace your pressure switch right away, as I suspect that this is your problem. Instead of your compressor shutting of at the cut out pressure level, it barrels on through, continuing to compress air until the PRV blows.

Here is info on pressure switches to help you identify yours.

Cheers,

Bill