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High pressure pump plans (Request, yup)

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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High pressure pump plans (Request, yup)

Unread postAuthor: Necrosis » Sat Aug 02, 2008 12:57 pm

I need help with this, In fact not with the pump itself, but with the valve.

The pressures involved will be too high for a bought checkvalve (I doubt we even have checkvalves in hardware stores here) , so what can I do to make a custom one? I allready tried a poppet valve, but it didn't seem to seal very well... I could attempt this again but up the scale a little... so it doesn't have to be that precise...

Any other ideas though? I have access to a lathe, so don't worry if that's a requirement for your design.

Your help will be much appreciated.
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Unread postAuthor: SpudFarm » Sat Aug 02, 2008 2:10 pm

a schrader?

(of making a simple diagram i will send you on msn)
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Unread postAuthor: Necrosis » Sat Aug 02, 2008 2:21 pm

SpudFarm wrote:a schrader?

(of making a simple diagram i will send you on msn)


That won't exactly hold 60-100 bars. :(
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Unread postAuthor: SpudFarm » Sat Aug 02, 2008 2:22 pm

didn't gippeto bring one to 300bar?
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Unread postAuthor: Gippeto » Sat Aug 02, 2008 2:24 pm

Did you check the "How-To" section? Guess not.

This pump was designed with the non-lathe owner in mind.

With a lathe, you should be able to make several improvements on this simple design.


http://www.spudfiles.com/forums/easy-st ... 13277.html



Edit: And I did take a schrader to 300Bar.

Thread is here:

http://www.spudfiles.com/forums/the-fai ... 15393.html
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Unread postAuthor: Necrosis » Sat Aug 02, 2008 2:37 pm

Gippeto wrote:Did you check the "How-To" section? Guess not.

This pump was designed with the non-lathe owner in mind.

With a lathe, you should be able to make several improvements on this simple design.


http://www.spudfiles.com/forums/easy-st ... 13277.html



Edit: And I did take a schrader to 300Bar.

Thread is here:

http://www.spudfiles.com/forums/the-fai ... 15393.html


I am looking for a pump that will hold a minimum of 60 bars... wich is in fact double the pressure you used.. so I kind of did not try it..
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Unread postAuthor: SpudFarm » Sat Aug 02, 2008 2:40 pm

this should do
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Unread postAuthor: POLAND_SPUD » Sat Aug 02, 2008 3:00 pm


Edit: And I did take a schrader to 300Bar.

Thread is here:

http://www.spudfiles.com/forums/the-fai ... der-valve- t15393.html


I am looking for a pump that will hold a minimum of 60 bars... wich is in fact double the pressure you used.. so I kind of did not try it..
hmm I don't get it... 60 bar is more than 300 bar?
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Unread postAuthor: Gippeto » Sat Aug 02, 2008 3:02 pm

I understand. :)

This was the check valve I first built for the co-ax. Burst pressure of 9000psi using yield strength of the material (316 stainless).

Threads are 1/8"npt

The ball is 1/8", the o-ring I believe is an 005. The plug is hollowed out to allow the ball to travel slightly. It also "retains" the o-ring in place.

Edit: Almost forgot, you will have to add a spring to use it in a pump. :)
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THis layout might be better for your needs.
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Unread postAuthor: POLAND_SPUD » Sat Aug 02, 2008 3:16 pm

hmm I don't get it... 60 bar is more than 300 bar?


I understand. :)



LOL I don't :? (wtf??)

anyone is willing to explain this ?
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Unread postAuthor: Gippeto » Sat Aug 02, 2008 3:20 pm

@ PolandSpud, I believe he was referring to the pump I built. It was only tested (at that time :) ) to 400psi (~28bar).
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Unread postAuthor: POLAND_SPUD » Sat Aug 02, 2008 3:42 pm

@gippetto ohh now that does make sense... sorry

@ necrosis of course you'll have to use much smaller diameter of the piston and possibly use a hydraulic tubing instead (or at least buy very thick walled copper pipes but I am not sure if soldering will hold ~ 1000 psi ?:? )....and add a shrader to that to cut costs


I don't see any reason why a floating piston shouldn't work so that's pretty much everything you need

it seems like a very nice project...
I've been thinking of building something like this for quite a long time
Once you get addicted to high pressures you always want to go higher....:wink: 80 bar would satisfy me for a while...
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Unread postAuthor: Gippeto » Sat Aug 02, 2008 4:15 pm

@ Necrosis

I've been tossing this around for a while. It should be a fairly simple project with the lathe. I've just been too busy to put it together of late.
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Unread postAuthor: Necrosis » Sun Aug 03, 2008 2:27 am

POLAND_SPUD wrote:@gippetto ohh now that does make sense... sorry

@ necrosis of course you'll have to use much smaller diameter of the piston and possibly use a hydraulic tubing instead (or at least buy very thick walled copper pipes but I am not sure if soldering will hold ~ 1000 psi


Yeah, I have hydraulic pipe lying around 8mm in diameter.

And I'll thread the connections anyway, so no need for soldering. :).
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