Homemade Hand Pump

Post stuff here pertaining to non-spud related projects that many forum members seem to enjoy. Hovercrafts, dirt bikes, electronics, propane-powered bikes, go-karts, etc. This is more of a project area,
not a place to chat about what you saw yesterday on TV. Remember to keep it within the forum rules!

Postby cacophobia91 » Sun Jun 18, 2006 1:55 pm

I have seen a lot of hand pumps on this site but I cant figure out how to make one. So far I can put pressure into a contaner but after the first pump, I cant get it to get any higher. What I have now is a .5" pvc pipe with an o-ring piston type thing attatched to a smaller pipe. At the end of the .5" pipe there is a valve to let air into the chamber and one to let air into the pump when I pull it back. I know that their is more to it but I dont know what else a pump has that makes it work.
cacophobia91
 
Posts: 95
Joined: Tue Dec 06, 2005 3:42 pm
Location: Azores
 

Postby saladtossser » Sun Jun 18, 2006 2:08 pm

the way you say it, it should work, are those valves check valves?
whats the diameter of your stick?
saladtossser
 
Posts: 1207
Joined: Sun May 29, 2005 5:00 pm
Location: Canada
 

Postby cacophobia91 » Sun Jun 18, 2006 2:46 pm

No I just used ball valves. I used .5" pvc for the tube. After I pump it a lot and let the air out of the chamber, it doesnt seem like it is very much diffrent than if I were to pump it once. Would this be from the o-ring not being able to hold the preasure of multiple pumps or something? I couldnt hear a leak.
cacophobia91
 
Posts: 95
Joined: Tue Dec 06, 2005 3:42 pm
Location: Azores
 

Postby sharpshooter » Fri Jun 23, 2006 11:34 pm

ball valves??? did you like open and close each on every pump???

It would be so much easier with check valves.

what size is your tank? It is possible that you already at the max that you could push down or the o-rings could hold back.
sharpshooter
 
Posts: 185
Joined: Tue Apr 26, 2005 5:37 pm
Location: USA
 

Sponsored

Sponsor
 
 

Postby cacophobia91 » Sat Jun 24, 2006 9:26 am

Ball valves were what i had at the time. My tank is 1" pipe and 1' long. I put some water on top of the o rings and it bubbled so I will just start over with check valves and new o-rings.
cacophobia91
 
Posts: 95
Joined: Tue Dec 06, 2005 3:42 pm
Location: Azores
 

Postby Green Villain » Sat Jun 24, 2006 10:38 pm

where do you guys get check valves? Are they available at a hardware store, or do you have to order them? (sorry for the dumb question. I've seen them on McMaster, but never looked locally.)
Green Villain
 
Posts: 619
Joined: Tue Jul 12, 2005 11:07 pm
Location: USA
 

Postby Spudinator » Sat Jun 24, 2006 10:51 pm

Most hardwares carry them, I can get them from 1/2" Sch40 PVC to 2-1/2" Sch40 PVC at my local hardware store, they are fairly cheap too (about $15 for a 2" if my memory serves me correctly).
Spudinator
 
Posts: 1491
Joined: Sat Sep 27, 2003 12:10 am
Location: USA
 

Postby Green Villain » Sat Jun 24, 2006 11:11 pm

Thank You.
Green Villain
 
Posts: 619
Joined: Tue Jul 12, 2005 11:07 pm
Location: USA
 
 

Return to Non-Spudgun Related Projects

cron