recovery machine ?

[devlin maguire]

What do they mean by an oiless compressor,surely a contradiction in terms,if it has a recip piston it needs lubrication,any one ?
Devlin

[monkey spanners]

All the small ones are oilless now! thats why they are so noisey,

http://advancedengineering.co.uk/uk-...ct.asp?pid=241

Like a lot of hobby air compressors now, i think they use teflon or some such in the cylinder to reduce friction.

Jon

[chemi-cool]

As simple as it says, no oil.

[mikeref]

There was a problem with some models. Apparently, when first used straight out of the box, one has to recover refrigerant from a recently opperating system, rather than something that had been shut down for some time. I was told it had to do with oil with the refrigerant that lubes the machine parts. Yeh, they are noisy.. Mike.

[cool runings]

.

They use carbon fibre pistons, con rods and rings so don't need
oil to run. Oil from the system passes through but they are deemed oil free.

Cool runnings

.

[Quality]

Carbon filled ptfe is the material most compressors use.
You only need to spit on carbon to lubricate it

[devlin maguire]

So it's a gimmick then you still need to be carefull with oil cross contamination I thought maybe it had a oil removal system, at the price they want for one I would have thought it was platinum ****** plated
Dev

[james10]

It's no gimmick as long as you use the correct methods there will no cross contamination, I use mine all the time on various gases and not had a problem yet, could be 22 one day or 404 the next

[glenn1340]

Even big compressors can be oil free, 340hp double acting air compressors use PTFE piston rings and austenetic liners. They cost a fortune to maintane so they`re a disapearing breed now

[SeanB]

Gast make oil free vacuum pumps. Lovely units, but expensive! I use a set of old carbon vanes as a cup holder, figured that is about all they are usable for after removal, unless I need a big 4H pencil.