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Originally Posted by wilsonmw04
what's the difference between half and and say 3/4?
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That's irrelevant, for the purposes of this discussion. All I'm saying is that with a 5/4 3-position valve with center pressure, you can only move the cylinder to a total of three positions - out, in, and a predetermined spot in between the two extremes.
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I think you are missing the true meaning of this...
G. For the purposes of the FRC, a device that creates a vacuum is not considered to be a pneumatic device and are not subject to the pneumatic rules (although they must still satisfy all other appropriate rules). These include, but are not limited to, venturi-type vacuum generators and off-the-shelf vacuum devices (as long as they are powered by provided or permitted motors).
The storage is what is under discussion and storage is most definitely under the rules.
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Even though my team probably won't decide to use this system, I'll bring it along with me to St. Louis, to have it looked over by an inspector.