Inspection Checklist - Relief Valve(s)

[FRC1262]

In the inspection checklist for the pneumatic system, it states that if utilizing an off-board compressor there must be a relief valve both on and off the robot. However, <R73> states that the relief must be attached directly to the compressor.

Is this an error on the inspection sheet?

If the robot is supplied with air from the KoP compressor properly outfitted with the relief valve as per rules, is there a real need for two relief valves?

Please advise.

[GDC]

The inspection checklist is correct. Rule <R76> requires that a pressure relief valve be directly connected to the compressor. Rule <R73> requires that any pneumatic circuit also include a pressure relief valve. If the compressor is off-board, then under Rule <R73> the on-board portion of any pneumatic circuit must include a second pressure relief valve (obviously, not connected to the compressor). The second valve is required as a safety relief, to prevent any over-pressure conditions (e.g. when a pneumatic cylinder is back-driven by a load sufficient to overcome the applied pneumatic force).