Hydraulic valve question

[Cat966c]

Hey all; was just wondering if someone could explain to me in lay man terms how a hydraulic valve works. I'm going to try to make a budget one down the road and I think I have all of it figured out except the valve part aka the thing that governs the back and forwards motion.

[Finster]

There are a lot of different types of valves out there so its hard to answer your question simply, but here are a couple videos which show valves.

Close center spool valve
https://www.youtube.com/watch?v=vY_bguSNgSc

Rotary valve (not the best animation but might help)
https://www.youtube.com/watch?v=th_eOkTh9yE

Basically you are opening one port exit to the pressure from the pump while connecting the other port to the return to the tank. A spool valve does this by sliding the 'lands' (bigger parts) back and forth and a rotary valve does it by turning the cutouts so they line up with the ports. Hope this helps...

[Cat966c]

Yeah. Im kinda stumped about when one port opens to push it forward, what kind of wiring makes the other port close, or go back to the return tank

[Supermario]

I remember seeing a control valve sliced in half to show exactly how porting looks inside when I was in trade school.
Do you have a college or trade school type place in your neighbourhood? I'm sure they'd have some cut open components to help show how they work?

[RCP57]

My stuff use plug type valves. I went to the local Princess Auto and bought a really cheap 3 way air valve and took it apart so that I could see it first hand. I was bad after that and took it back to the store...https://www.google.ca/url?sa=t&rct=j...gEHpI6_JXYupyw I'm sure you could find something like this at any similar store.

[Supermario]

. My bad. For some reason I thought you were asking about real scale hyd valves on a RC site.. what was I thinking

[Cat966c]

Haha, no prob! (: We don't have any trade schools very close to here, but I'll look around

[Cat966c]

Bump?

[RCP57]

Do a YouTube search. Plenty of videos explaining how they function.

[Rimrock]

One have the 'axial slide' valve, the most common in 1:1, and the 'rotate valve', most common in scale modelling. To find out how the valve are put together is not that big problem (google/youtube) but to make one at home that holds on to any pressure is the challenge. To have good success, miniature O-rings often are to be added in the correct locations in the valve, which most of the German miniature hydraulic producers have realized, but the chineese are struggling a bit more, as some extra O-rings will ad some cent's to the production cost it seams..or whatever. Maggom newest valveblocks and pumps seams to work okay, at a relative reasonable price..as your possible 'plan B'

[Cat966c]

Cool. Thanks! (:

[Cat966c]

Finster: OH MY GOD--that's SO genius!!!
Thank you!!!