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Idea for base for stirrup pump

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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Idea for base for stirrup pump

Unread postAuthor: dongfang » Fri Mar 07, 2008 5:52 am

Hi,

I don´t know if you have already seen this. I found a gadget that could be perfect as a foot for home made stirrup pumps.

See picture.

It´s walled a Wandwinkel here (wall angle). It´s 3/4" both ports. The 3/4 to 3/8 adapter could contain a home made check valve, made of air components.

One could drill or file out the threads in the top port and get a 25mm pipe into it. With a wall thickness of, say, 2 mm it would have a piston area of 3.46 cm^2 -- that if, a pressure of 12 bar would require a 41 kilogram force - quite ok I think.

Regards
Soren
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A Wandwinkel and a reducer.
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Unread postAuthor: lockmanslammin » Fri Mar 07, 2008 9:46 am

So your saying you have purchased these parts and your going to build one? Or just that a person could?
If it were me I would keep the threads in there and just jet a sweat to male pipe thread adapter. Just keep in mind that you want all area that is not used by the piston to be as small as possible. On my pump I will be filling the areas that come before my check valve with epoxy and drilling a small pilot hole through the center of it.
good luck, Lock
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Unread postAuthor: Gippeto » Fri Mar 07, 2008 2:21 pm

You "could" also build the check into the base of the pump cylinder and screw it right into your fitting. This is what I and a few others have done.

Like that fitting though, going to have a look for one. Thanks! :)
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Unread postAuthor: POLAND_SPUD » Fri Mar 07, 2008 3:43 pm

are there any smaller sizes (like 1/2" or smaller) available as well ?
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Unread postAuthor: dongfang » Tue Mar 11, 2008 7:07 am

Hi,

I'll check next time I go.

Regards
Soren
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Unread postAuthor: Hawkeye » Tue Mar 11, 2008 9:43 am

You can get those in brass with one port a sweat fitting and the other threaded. At least here in Canada.
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Unread postAuthor: dongfang » Thu May 08, 2008 4:08 am

Hi,

are there any smaller sizes (like 1/2" or smaller) available as well ?


YES. I got an 1/2" yesterday.

I will try to see if I can get a 16 mm aluminium tube to sit and seal reliably in a adapter (16 mm PEX tubing <--> 1/2" pipe thread). Then I will, of course, put the adapter on top of the ceiling angle (it's not a wall angle, which I called it before) and the pump cylinder on top of the adapter.

The hole thru the adapter almost invites to just brazing in a Presta valve as a check valve. No more homemaking of check valves...

Regards
Soren
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