Quote:
Originally Posted by martin417
I'm not sure you are thinking of the correct valve. I don't see a way to use a quick exhaust to isolate anything. The advantage of the quick exhaust is to allow the air to vent freely in one direction so it doesn't have to go all the way back to, and then through, the valve. That way a cylinder can act much more quickly. If you were using a cylinder as a pusher or punch for the ball, you could use a quick exhaust on the rod side of the cylinder. That way, when you pressurize the retract (rod side) port, the cylinder would retract, and when you pressurize the extend side, the cylinder would extend, but you would not have to force the air from the rod side all the way back through the tubing to the control valve, instead it could exhaust right there at the cylinder.
Edit: here is a good example. |
I'm not talking about a quick exhaust valve in this comment, I'm talking about a 3-way exhausting valve, part H. of rule R77.
Such as this
Quote:
R77 H. Shutoff valves which relieve downstream pressure to atmosphere when closed (may also be
known as 3-way or 3-way exhausting valves).
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Quote:
Originally Posted by martin417
It's only a check valve if you plug the exhaust port. You could also plug any other port on the system and violate the rules by trapping air.
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It's a check valve no mater how you plumb it, it's only legal to use it if you don't plug the exhaust port. The rule that allows quick exhaust valves
like this to be used is
Quote:
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R77 G. Check valves, provided that the requirements of R89 are still met.
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The quick exhaust mechanism is inherently a check valve.
Do you think a different part of R77 applies to quick exhaust valves?