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air compressor with check valve?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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air compressor with check valve?

Unread postAuthor: daniel323 » Tue Feb 17, 2009 10:25 pm

hey

I have a small air compressor that plugs into a basic power outlet. I was wondering instead of making a 300 psi stirrup pump, could i put a check valve on the end of the hose of the air compressor to acheive those types of pressures (300) psi?

thanks
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Unread postAuthor: roboman » Tue Feb 17, 2009 10:28 pm

I don't think so. A check valve prevents backflow, but doesn't increase pressure.
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Unread postAuthor: daniel323 » Tue Feb 17, 2009 10:32 pm

well if it prevents back flow... the air compressor cant hold 300 psi, but if it doesnt go back into the compressor and just goes straight through the check valve and into a copper gun wouldnt it be able to hold that much?
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Unread postAuthor: roboman » Tue Feb 17, 2009 10:58 pm

You can't fill your gun with a higher pressure than your compressor can produce. It just doesn't work that way. Your compressor does have a check valve in it... on the pump! It allows pressure to build up in the tank. However, the compressor has a safety device which will shut off the motor at a certain pressure. Besides, you will most likely burn out the motor or blow your tank long before you can produce 300 psi with a small compressor. The tank pressure has to be equal to the pressure in the gun. The compressor tank and your gun equalize when you connect a hose between the two of them. Even with a check valve, the compressor would have to be able to produce 300 psi.
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Unread postAuthor: daniel323 » Tue Feb 17, 2009 11:01 pm

oh yeah, thanks now i see what you are saying.
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Unread postAuthor: rp181 » Tue Feb 17, 2009 11:03 pm

You can sacrifice flow for pressure, commercial devices are expensive. There is just a piston, with a smaller bore, so you get more pressure.
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Unread postAuthor: daniel323 » Tue Feb 17, 2009 11:08 pm

yeah i think im just goin to build a stirrup pump
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