Subject:
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Re: electric pneumatic valve actuators?
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 26 Aug 2004 23:44:43 GMT
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Reply-To:
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robots@deeletefAVOIDSPAM3p.com
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Viewed:
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3416 times
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"Joe Strout" <joe@strout.net> wrote:
> - A pinch valve made by pinching shut a pneumatic tube with a wheel or lever
> attached to a motor
I got thinking about this. My first thought was to use a worm gear
and a slip gear to pinch and unpinch the tube. This would probably
work, but would not give you what you want. You need a valve that
will exhaust the flow to a different path at some point. A pinch
valve is just a 2-way valve, it's either open or closed, and there is
only one flow path. With a 2-way valve, the air that goes into the
cylinder has to come out by the same path. This generally doesn't
work. You can use 2 2-way valves to make a 3-way, but that would mean
two motors. Or, if you made it so it pinched one tube when it
un-pinched another, that could work.
This all assumes that you want to use the pinched tubing to control a
cylinder. If you're doing something else, that might be a different
story.
> - A from-scratch valve made out of LEGO parts (probably tricky to get that air
> tight, but might be good enough)
This would never be airtight unless you glued all the joints shut.
Even a gap of .001" would leak. Been there, done that.
> - A real-world (commercial) valve actuator adapter for use with LEGO (tricky bit
> here is finding one for a reasonable price)
I commented on this in my previous post.
> Have you seen any of these, or something else entirely, to control the flow of
> air with standard LEGO 9V electronics?
Now you've got me thinking. I wonder if I could make a pump or
cylinder into a valve....
-Jon
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Message has 1 Reply:
 | | Re: electric pneumatic valve actuators?
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| (...) I've always thought a valve with similar form factor to a large cylinder, that works like a steam engine valve (URL) would be really nice. It would probably have significantly less resistance than a standard LEGO valve, and more importantly, (...) (20 years ago, 27-Aug-04, to lugnet.technic)
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Message is in Reply To:
| | electric pneumatic valve actuators?
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| I've been thinking a lot lately about electrically activated (as opposed to manual) pneumatic valves. I've seen several designs on the net where someone has taken a regular LEGO manual valve, and attached a motor. That's clever, but I'm wondering if (...) (20 years ago, 26-Aug-04, to lugnet.technic, lugnet.robotics)
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