Quote:
Originally Posted by DonRotolo
Be careful here. There was a Q&A response that stated something to the effect that the vent valve must vent all pressure in the system. I may be wrong here (I frequently am!) but just double-check that it's OK.
Note: I did see a Q&A response stating that 'center off' valves were OK, so I am somewhat confused here. Again, a frequent occurrence... 
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I am hoping you are referring to when the 120 psi air dump valve is (manually) openned, no cylinders can be left pressurized. It will do that for both 2 soleniod and single soleniods valves (at least what we use) so we should be okay there.