Al's 2016 Inspection Thread

[Alan Anderson]

Originally Posted by Jon Stratis

The regulator is required to be relieving, per R82, for exactly that reason. When high pressure is released in this case, the low pressure side would be vented through the regulator.

Merely being a relieving regulator wouldn't necessarily be enough. A relieving regulator vents to atmosphere when performing its "relieving" function. Every regulator I have seen on an FRC robot does let air flow in reverse when the input pressure is lower, but nothing says it must do so.

While I've never actually encountered one in the wild, I know there are regulators that don't care whether the "high side" pressure is lower than the "low side". Such a regulator would maintain the working pressure even after the stored pressure part of the system was emptied. <R89A> would make it illegal to put the vent valve on its stored pressure side even though the regulator satisfied <R82>.