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Ok, so I need to make a compressor that reaches 4500 psi.  I live in a farm town and my dad has a tractor so I wondered if I took two identical hydraulic cylinders and filled one with what I was compressing, and the other I powered with the tractors hydraulic system, if I would be able to achieve high pressure and fill tanks, assuming the hydraulic pump and cylinders are rated for that pressure.  Or could I just use a hydraulic compressor.

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No, the capacity is too small. You need a really efficient compressor system. To get to 4500 psi these are usually multicylinder compressors with several stages to get it up to 4500 psi.

orksecurity (author)2011-02-10

I'm wondering whether something could be done with varying-diameter hydraulic cylinders -- apply 100 PSI to a 2"-square piston, get 200 pounds of force, apply that force to a 1"-square piston and get 200 PSI in its hydraulics. Stack those multipliers up until you get enough pressure or something fails...

jj.inc (author)2011-02-10

Thanks, I didn't think of this, its a great idea, exept instead of using many pistons I I would still use the one, just multipul time.

Re-design (author)2011-02-10

Well, that could work if the idea is to put 4500 psi of force on something, but I assumed that since the op mentioned compressor he needed a quantity of air compressed to 4500 psi. Maybe to fill scuba tanks, air packs for the vol. fire department or something like that.

jj.inc (author)2011-02-10

It is for a large cascade system and/or painball, thanks for your earlier input.

Dark_Snowy (author)2012-02-21

You can't just use the one multipul times.

Air volume = origional volume x (origional pressure / final pressure)
Compressed volume of 100 litres = 100 x (1 / 4500)
So 100 litres becomes 0.022 recuring.

If you used a 4500psi pump capable of taking in 100litres an hour it would take 450 hours to fill just a 10 litre tank. 18 days is too long for me.

You need to feed 3000psi into to 4500psi pump.
Compressed volume = 100 x (3000/4500)
So instead you get out 66.66 recuring

So you start with a normal air compressor, say 110psi. Feed that into your 1000psi pump, which feeds into a 2000psi pump which feeds the 3000psi pump which feeds the 4500psi pump.