Quote:
Originally Posted by headlight
I think what you're looking for is called an adjustable check valve. ...
As for their FRC legality, standard "rules aren't out yet" disclaimer. Under the previous rules you may have been able to consider them a check valve (R77 G), or perhaps a "passive flow control valve" (R77 F).
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That would be a considerable stretch of the rules. If the rules this year read like last year's that would definitely be a Q&A item. If the Q&A ruling is (for example) "yes, an adjustable check valve is a check valve", then you would have strong documentation to support your claim at inspection, and you could expect uniform application at different events. LIkewise, if you get a "no" ruling, you should be able to expect other teams not to be able to use them either (though of course, things get missed).
The pneumatics rules in recent years have been such that nothing is allowed unless is specifically listed as allowed in a pneumatics rule. (In contrast to most mechanical items such as arms or gearboxes, which are allowed unless there is a rule which excludes them.)