Subject:
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Re: Pneumatic Questions
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Newsgroups:
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lugnet.technic
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Date:
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Mon, 21 Nov 2005 01:02:04 GMT
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Viewed:
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4611 times
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In lugnet.technic, Geoffrey Hyde wrote:
>
> Has anyone tried to open up the pneumatic switch (old and new ones) to see
> if there is a way this 4th port could be vented into a tube and thus
> connectable to the model instead of atmosphere?
Been done here: (http://www.abs-robotics.com/internals/pneumaticswitch.htm).
Doesn't look like it's gonna be easy to modify.
> I wonder if LEGO would make the 4th port available for model makers?
Wish they would!
BTW, I made a bummer in calling the hidden exhaust port the 'fourth port'. It
should actually be port 3.
In pneumatics nomenclature, the ports are designated by numbers as follows:
1 - pressure port (inlet for compressed air (and also vacuum, I guess))
2, 4 - output ports (to cylinder, etc)
3, 5 - exhaust port (to the atmosphere but could also be connected to cylinder,
etc).
The LEGO pneumatic valve has a common exhaust port 3 (which is hidden).
Technically it is a 4-way, 3-position, centre-closed, manually operated
directional control valve. That's a mouthful!
Hope that clears the air.
CSSoh
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Message is in Reply To:
 | | Re: Pneumatic Questions
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| "Kevin L. Clague" <kevin_clague@yahoo.com> wrote in message news:Iq9H1s.2Ao@lugnet.com... (...) Has anyone tried to open up the pneumatic switch (old and new ones) to see if there is a way this 4th port could be vented into a tube and thus (...) (19 years ago, 21-Nov-05, to lugnet.technic)
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