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Unread 29-02-2004, 05:30
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Re: Creating no pressure with double solenoid?

there is a much easier way....

you can simply use a three-position valve, it works just like a dual solenoid (and looks almost identical), but when you aren't sending electricity to either of the solenoids then it springs to center. This engages "all ports blocked" which basically means no air can flow through the valve at all

we are using two of these on ours, the only thing is you can't pulse power unless you have it give power just long enough for the cylinder to extend.

the advantage is that if you loose air pressure in you're entire system, then that device will still stay wherever you had it assuming it was in the center-off position. the only problem with this is that it takes air to actuate the solenoid (since the solenoid is like a mini-cylinder) so until you regain pressure on the incoming line you will not be able to release the cylinder from the position it was in.

Last edited by Jeffrafa : 29-02-2004 at 05:48.
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Unread 29-02-2004, 05:54
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Re: Creating no pressure with double solenoid?

Since it sounds like you are trying to not send pressure you could also use a three position valve that is "all ports open" in center position.

This means that it works just like the dual except if you don't send a signal to one of the solenoids then it will open up both cylinder ports to exhaust, therefore releasing all pressure in the cylinder and allowing it to freely move.
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Unread 29-02-2004, 12:28
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Re: Creating no pressure with double solenoid?

Quote:
Originally Posted by Jeffrafa
there is a much easier way....

you can simply use a three-position valve, it works just like a dual solenoid (and looks almost identical), but when you aren't sending electricity to either of the solenoids then it springs to center. This engages "all ports blocked" which basically means no air can flow through the valve at all

we are using two of these on ours, the only thing is you can't pulse power unless you have it give power just long enough for the cylinder to extend.

the advantage is that if you loose air pressure in you're entire system, then that device will still stay wherever you had it assuming it was in the center-off position. the only problem with this is that it takes air to actuate the solenoid (since the solenoid is like a mini-cylinder) so until you regain pressure on the incoming line you will not be able to release the cylinder from the position it was in.
Where did you get these valves? It's to late for us to get them this year... but this would be a big help in the future.
Thanks Tom Cooper
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Unread 29-02-2004, 20:45
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Re: Creating no pressure with double solenoid?

Most any Pneumatics distributer would have them.


Norgren, SMC, Festo, and Parker all make and carry three position solenoid valves.
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Unread 29-02-2004, 22:45
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Re: Creating no pressure with double solenoid?

WHAT!!!!?!???
we were allowed to use 3 position ones!?!?!?!
i never knew that!! oh, well... if only i knew... would have saved about 2lbs...
(our double solenoids are about 1.5lbs each. oh, so if any one has any spare lighter ones, we'd really appreciate it if you can exchange them for our heavy ones even just for the 3 days.
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