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Unread 13-01-2014, 16:55
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Re: Placing a Tank after a solenoid valve

Quote:
Originally Posted by gpetilli View Post
I too am not an expert, but I believe the standard FRC solenoids use a supply "pilot" which means that if the input air pressure goes away (think manual dump) then the solenoid opens allowing the output air to back through the output to the input. This works only if there are no check values in the system and does not depend on any electrical signals. We have had issues in the past that if the working pressure is too low, there is not enough energy to "engage the pilot" and the solenoid does not activate. If I am correct, then this would allow the low pressure storage tank to vent when the manual release is opened.
Yes the common solenoids are air piloted but that is not relevant to their operation. They just use air pressure to move the shuttle, once the shuttle is moved it stays there and w/o enough air pressure they can't move the shuttle.

Since the shuttle stays in the same position the pressure on the working side of the valve can vent back through the valve. So yes tanks on the working side of a commonly used FRC solenoid will vent assuming as you noted that there aren't any check valves added into the system.
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Last edited by Mr V : 13-01-2014 at 16:58.