SpudFiles

This is an easily constructed stirrup pump. It should be replicateable by most spudders out there. There is a pictorial on photobucket here;

http://s245.photobucket.com/albums/gg76 ... up%20pump/

Cost to build: About 20.00 for the pump and check valve. Another 10.00 for the manifold. Gage and valve belong to my work.

The original thread is here:

http://www.spudfiles.com/forums/easy-20 ... 13264.html

It has been brought to my attention that a suitable check valve exists and can be had at Lowes, Home Depot or plumbing suppliers. You might consider looking for them while getting the rest of the materials. To build or buy that is up to you.

edit: I had another look for these, a hard one. While I did find in-line checks, they were not the same as the one shown in the original thread. They had a bronze sealing face, and the spring was wrong ((spring pulls valve closed instead of pushes) this is a dead-space issue). If you decide to buy a check, make sure it at least has a soft (rubber) sealing face and a pressure rating equal to or greater than you need.

Not everyone may have access to these stores, so I will include instructions to build the check valve.

Material list:

3/4" copper tube one 25" piece and one 2" piece I used type M
One 3/4" tube to 3/4"NPT fitting
3/8" all thread rod 3 foot length
3/8" x 2" grade 5 bolt
(6) 3/8" flat washers
(1) 1/2" flat washer
(6) 3/8"nuts
(1) 3/8" threaded coupler (long nut)
(1) 3/8"od. x 1" length compression spring (a light one)
Fibreglass resin or other low viscosity (runny) epoxy
(1) 012 o-ring
(1) 114 o-ring
Red Loctite/5 min epoxy/jb weld/ etc. (any one, I had red loctite)

Tools required:

Drill press or (much more difficult) 3/8" hand drill and a willing friend to hold it
Metal file
Hacksaw
Tubing cutter
Torch, flux and solder or suitable HIGH strength epoxy
Wet/Dry sandpaper ~320 grit
Measuring tape
Marker (sharpie pen)

Update: My pump and check valve have been tested and proven (to my satisfaction) to 400psi.

Let's get started.

Way to go Gippeto, not everyone would take the time to show us all that.
Nice file handle btw.

**** The pictures and instructions in this half are in the reverse order. I will fix this in the next day or so. I've already fixed the first half.


**** Use steel for the pump handle to avoid having it break while in use.



Pretty easy so far, huh?

It does not get harder.

Let's get back to work.

Thank you Nova.

An exercise in backward thinking!

Yeah, golf balls have almost as many uses as WD-40.

Great!
I like it, how much did it cost you in materials?

great how to, and excellent work on the pump. I know it will answer a lot of questions.

"eff" Pretty much every picture uploaded using this site doesn't work for me. (Extremely irritating).
(From what I hear) I am sure this design will be used extensively by many members, good job

nice tutorial.

i definitely like the way you put your spring retainer together.

very cool

Thank you.
I have updated the top post with cost, etc. The pump and check are working perfectly, and I have satisfied myself that it is safe to 400psi. (see original post for details)

And how much do you have to weigh for that 400 psi???

With the Oring setup you have, wouldn't a floating Oring be easy to use.

Somewhat more than the average 12 year old.

Pizlo, are you referring to the piston? If so, it is a floating o-ring. The air gap is small, but it is there.

Nice job man. I like it:) I guess all I gotta do now is get into the epoxy stuff, lol.

Thanks. Epoxy can be very useful, and should never be dismissed outright.

I used it to prevent the washers from digging into the pump cylinder. If you have another way to accomplish this, by all means try it.

It is the principles which matter, not the execution.

I did some quick calculations, and for my weight (130 lbs), I think I would be able to generate about 300 PSI. I just used the equation pressure = force/area; not sure if I forgot to account for something.