Hi!
I have a question about point 8.8. of the rules:

A certified pressure relief device [PRD] must be installed in each part of the pneumatics system where
a different operating pressure is used (operating pressures separated by a pressure regulating device).

That means, if i have three different working pressures for example:
i use full pressure for main cylinder, 2 bar for retracting main cylinder (for saving gas) and 7 bar for a short stroke pushing device on the backside of the robot (to push the robots frontside down during acceleration). In this case, i need 3 pressure relief valves according to the rules! Normally a 3 way pressure regulator have in fact a built in relief valve to prevent a higher pressure than adjusted in the secondary (working) line. Is this kind of valve legally valid as a relief valve ?
Obviously i´m talking only about the low pressure circuits.

BTW: a big thank you to all organizers and moderators for this great new forum!!

Helmut