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Unread 09-09-2012, 22:32
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Re: Andy Mark Supershifter with Pneumatic shifters

Quote:
Originally Posted by Coffeeism View Post
Why should it be 60 PSI? Shouldn't it be closer to the actual force required?

Our own shifters we had, we've always run at 20 PSI for the solenoid valves sake. I was under the assumption that it took less force than the 12 lbs to shift but I could be wrong about this as I have no experience with the super shifters.
Pneumatic solenoid valves of the type used in FRC are internally piloted valves, which means the pressurized supply air is used to actuate the valve spool, not the solenoid. The solenoid is very small and only opens a tiny port to trigger the pilot air. Such valves have a minimum pressure that will allow it to operate, usually around 30-40 psi. So they actually prefer a high pressure and only function reliably when it is sufficient. So a note to teams: If you have a valve that is not responding when you are certain it is getting a proper electrical input, and you are using low pressure, chances are the pressure too low for the valve to operate.
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