R77 was about the pressure switch last year; I presume the 2015 question was about R66 (F).
I just asked
Q926:
Quote:
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Q. Is a quick release valve or quick exhaust valve, such as the ones sold by Bimba (#1BQEV), or Automation Direct (QEU14) considered a check valve, and thus a legal pneumatic component under R77 (G), provided other rules are also met?
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I agree with Martin that the answer should be no. Check valves have two ports, QEVs have three. I don't see any way to plumb a check valve to make it into a QEV, either.