Quote:
Originally Posted by Oblarg
A good question that has never been adequately answered, especially given the fact that it's legal to just not put a fitting in one end of a dual-stroke cylinder and vent directly to atmosphere that way.
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Some folks disallow quick exhaust valves because they are technically "Check Valves" (Only let air pass in one direction, other direction is vented) and anything that can keep a system pressurized (like a check valve) after the air has been vented to the atmosphere is illegal, since we don't want ANYTHING left pressurized when the system has been opened up, for obvious safety reasons.
The problem with this argument is the QUICK exhaust valves actually make the system SAFER in that they GUARANTEE the system won't be pressurized.
Yes, we are working on the wording of that one too ... Sometimes common sense HAS to win ...
BTW - all the solenoid valves folks use that have a
center closed position are ALSO illegal under this rule (they can keep a system pressurized after venting), but no one seems to notice that ...