Another HP pump... 900+ psi

[Fnord]

I guess I should post this before I get lazy again.

This pump is not completely done; I still need to make a solid base and bolt everything down (It's hard to pump as it is right now).

-Body: 29" x 1/2" copper tubing
-(sleeved in 3/4" conduit for strength)
-Gauge: 0-1800 psi oxygen rated.
-Hookup: Mirco- quick connect valve
-Floating o-ring piston
-Homemade check valve made from modified fitting+schrader valve.


The schrader valve works, but it takes a lot of force to open it, so pumping becomes harder than it needs to be after a while. I may replace it with a completely homemade checkvalve later.


Prices:
Copper- ~$6.50
Fittings- (2 elbows, tee, bushing ~$7
Handle from and old pump which cost $10 before it broke
Everything else- Free


And of course, I don't have a gun to use this with.

[Jared Haehnel]

There will be a time when I will set forth and make one of these... nice work.

How much everything cost?

[Gippeto]

Looking good! That's very good pressure. Now you need to build something to use it in. (It'll drive you nuts if you don't.)

[jackssmirkingrevenge]

Just an idea, why not take spring out of the schrader so it closes by pressure only - or even easier, just use a presta valve?

[psycix]

Awesome!
But why first build a pump instead of a gun?

[Fnord]

Just an idea, why not take spring out of the schrader so it closes by pressure only - or even easier, just use a presta valve?

Well, Apparently this is the only schrader valve in the world that has an internal spring(not visible on the actual valve), otherwise I would have. I don't think anyone sells presta valves around here. In fact, I don't think I've ever seen one in person.

Awesome!
But why first build a pump instead of a gun?

I will need this for the injector on my railgun. Other than that, no reason, really. I just had the materials avalible.

[POLAND_SPUD]

wow... if I use 1/4" pipe will I get 1200 psi easily ?

[jrrdw]

Blowing a line at that pressure would be nasty! Nice work! Now, will your gun hold that kinda pressure? I guess so, you built it for that reason.