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Unread 23-03-2011, 09:22
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Re: Solution: Variable position of cylinder in compliance with <R74>

Quote:
Originally Posted by craigcd View Post
question to GCD 03/04/2011

2011FRC2221
Pneumatic Solenoid
R73> The pressure vent plug valve must be connected to the pneumatic circuit such that, when manually operated, it will vent to the atmosphere to relieve all stored pressure. The valve must be placed on the ROBOT so that it is visible and easily accessible. If the compressor is not used on the ROBOT, then an additional vent valve must be obtained and connected to the high-pressure portion of the pneumatic circuit off board the ROBOT with the compressor (see Rule <R69>).
First forums GDC reply 01-31-2011, 02:05 PM “Trapping the air under pressure as described would be a violation of R68/R73. The rule clearly states that when the required relief valve is opened, it will vent to the atmosphere to relieve all stored pressure.”
<R66> In addition to the items included in the KOP, pneumatic system items specifically permitted on 2011 FRC ROBOTS include the following items.
Pneumatic pressure vent plug valves functionally equivalent to those provided in the KOP,
<R66> allows multiple pressure plug valves.
Question: Can you plumb pressure plug valves in the pneumatic lines to the cylinder using a 5 port 3 position center port closed solenoid valve and position these valves adjacent to the original pressure vent plug valve and still be in compliance with <R73> .
Thank you
Team 2221
2011FRC2221

Reply from GCD
03-15-2011, 01:35 PM
The purpose of this forum is to answer specific rule questions, not to perform design reviews for legality. That decision will be left up to the inspectors at each event.
GDC

Look like you can proceed at your own risk at each regional
I think this would be illegal. From what I have read/heard/understood is this: your system must be void of all stored and working pressure when any one relief valve is opened. If there is pressure anywhere in the system after the valve is opened, the system is illegal.
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