Quote:
Originally Posted by Don Rotolo
It is possible you got a bad one, but they are awfully reliable and rarely fail like that.
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The "old" style FESTO valves used in 2009 and earlier did appear to have significant reliability issues. In most cases, the descriptions of the failures exactly matched the mode described above. This is the first evidence I've seen of any issue with the "new" style FESTO valves (which more closely resemble the SMC design, at least outwardly). Please report back and let us know if insufficient pilot air pressure was indeed the cause of the problem or not.