[Al Skierkiewicz]

Tech, that is a little misleading. If the valve releases during match play there is no penalty.
To correctly calibrate the valve, jumper the pressure switch so that the compressor runs continuously. Loosen the locking nut on the relief valve and when the pressure reaches at least 125 psi, start to rotate the hexagonal cap until escaping air is heard. Finger tighten the locking nut and repeat. If the valve releases pressure between 125 psi and 130 psi, tighten the locking nut and check one more time. The valves are not precise and not accurate for repeatability. The expectation is if the compressor should lose pressure control and run continuous, nothing on the robot will fail due to high system storage pressure.
All teams need to make this calibration before using pneumatics as the relief valve is not supplied pre calibrated for 125 psi.