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Easy 200psi... er make that 400psi stirrup pump

A place to ask general spud cannon related questions.
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If approved by the mods, is there a need for a how to on this pump and check valve

Poll ended at Fri Feb 29, 2008 9:24 pm

Yes, I would like detailed information.
14
100%
No, blow it out your ear!
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Total votes : 14
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Unread postAuthor: bluerussetboy » Sat Feb 23, 2008 4:44 pm

assuming your's and my interpretation of deadspace are the same. what i'm calling deadspace is the volume of air that resides in the area between the bottom of the piston at it's lower most position and the top of the sealing face of the check valve when closed.
currently the piston in my pump sits above the bolt in the below wog check valve. actually 3/16"(.1875") above the sealing face. my piston diameter is .785". this gives me a whopping 0.091 cu. in minus the volume of the head of the bolt.
so comparatively you have more deadspace than my store bought valve.
while the pressure is only rated to 250 psi, it doesn't have to be assembled from various parts.
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Unread postAuthor: POLAND_SPUD » Sat Feb 23, 2008 5:33 pm

great job.. it looks so clean and....hmm.... portable 8)

by reducing the diameter of the piston by a factor 2 you can increase the pressure by the factor of 4 ? do I get it right ?
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Unread postAuthor: Gippeto » Sat Feb 23, 2008 7:11 pm

I didn't know you could even get an inline check like that. If I had known, I probably would have gone that route too. The only checks I have seen in the local stores were of the "swinging flap" variety.

Thanks for raising the issue, this will simplify construction for those who can get one. It's a good find.

Poland spud, thank you and yes, you get it right.
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Unread postAuthor: bluerussetboy » Sat Feb 23, 2008 7:20 pm

too funny, i've never actually seen the 'swinging flap' kind at any store or wholesaler, only in remodels that i've yanked them out of antiquated mechanical rooms.
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Unread postAuthor: Carlman » Sat Feb 23, 2008 8:07 pm

@Gippeto: pretty sure he made it himself..
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Unread postAuthor: bluerussetboy » Sat Feb 23, 2008 8:26 pm

Spring loaded piston check valves can be found on mcmaster.

http://www.mcmaster.com/nav/enter.asp?pagenum=463
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Unread postAuthor: Mitchza89 » Sat Feb 23, 2008 9:50 pm

I cheated when I made my check valve for my pump. I used a comp fitting that went over the bottom of the pump shaft, I had a washer directly pushing the bottom of pipe. Just saves on a hell of alot of parts.
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Unread postAuthor: jackssmirkingrevenge » Sun Feb 24, 2008 2:41 am

bluerussetboy wrote:too funny, i've never actually seen the 'swinging flap' kind at any store or wholesaler


Are you sure, you do occasionally get slutty looking girls behind the counter :D
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Unread postAuthor: Novacastrian » Sun Feb 24, 2008 2:52 am

jackssmirkingrevenge wrote:
bluerussetboy wrote:too funny, i've never actually seen the 'swinging flap' kind at any store or wholesaler


Are you sure, you do occasionally get slutty looking girls behind the counter :D


And how many of those have you "fixed up" JSR?
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Unread postAuthor: jackssmirkingrevenge » Sun Feb 24, 2008 2:55 am

There's no fixing a swinging flap once it's inexorably lost the argument with Hooke's law :roll: :D
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Unread postAuthor: MrCrowley » Sun Feb 24, 2008 3:02 am

We're gonna need an AO section soon :roll:

Maybe we should have a 'spoiler' censor like the one on IMDB, hover your mouse over the censored bit and it shows the text.
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Unread postAuthor: Mitchza89 » Sun Feb 24, 2008 3:22 am

I really don't see why people don't make more pumps. Surely if anyone has the gear and the know how to make a spud gun, surely they can apply that knowledge to making a 300psi+ pump that will just increase the sh!t out of any gun.
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Unread postAuthor: jackssmirkingrevenge » Sun Feb 24, 2008 5:14 am

MrCrowley wrote:We're gonna need an AO section soon :roll:


Not being as subtle as I used to eh? I do, honestly, try and keep back, but some opportunities are just too good to miss :D
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Unread postAuthor: Gippeto » Sun Feb 24, 2008 12:16 pm

The tutorial is up now.

I'll find a higher range gage tomorrow and see what it'll make and hold pressure wise. I'll edit the tutorial to include this info.



Well, it's monday. I found a 600psi gage (borrowed) and installed it. I moved my pump handle up and used a feeler gage to measure the gap (~.036"). Measuring this gap after the test should give me some indication of how well my check valve is holding up.

As of now, the pump has been holding ~408 psi for 2 hours. :D

If the check valve does not bend (it should not, the copper is the weak link), I will be completely satisfied with the pump as is. To get much past this pressure, your going to need serious muscle to work the pump.
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Unread postAuthor: Mitchza89 » Mon Feb 25, 2008 10:06 pm

400psi....Geez mate.. Thats nuts. I've hit a wall with my pump. I can't find any right fitting o-rings :(.
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