Re: pic: It's systems integration time!
 

Answer of Q235

"No. Per R89 only one pressure vent plug valve may be used on the ROBOT which, when manually actuated, must vent to the atmosphere to relieve all stored pressure."

Bolded for my emphasis, doesn't state that the valve must be manually actuated to prevent air from being relieved. Though this question was asked about a different topic, its answer allows for spring actuated relief valves.

Re: pic: It's systems integration time!
 

We must have cross posted. :)

Full disclosure: We are going to install one and let the inspectors decide.

Re: pic: It's systems integration time!
 

You can accomplish this with a single-acting solenoid. In the case of a dead robot, the coil is deenergized and the opposing spring throws the valve.

Re: pic: It's systems integration time!
 

Well, we finally got an authoritative answer. We installed a push button dump valve, and it passed inspection at both of our regionals. At the championship, the inspector flagged it. The question went to Al himself. Al said that part of the function of the valve was that the handle visually indicates whether the valve is open or closed. It's not immediately visually obvious with a push button valve if the system is vented. Looking at the pressure gauges doesn't count. (I heard this second hand, as I was on a plane when the robot was being inspected.)

We swapped valves and competed with a valve with a handle.

Re: pic: It's systems integration time!
 

For now, this would not be legal. I had several teams remove the springs at Champs. We (volunteers) and everyone needs to know that the pneumatic system is open/vented when working on or near your robot.