9.7 Rating
All pneumatic components used with pressures greater than 50psi (3.4bar) must be rated/ tested to at least
the maximum pressure available in that part of the system. You may be required to provide documentation/certification to support this.
9.7.1 Custom Components
Custom made components, or parts operating above the suppliers maximum working pressure, must be
independently tested and certified at 120% of the maximum system pressure available at that point.
It seems you should have some documentation stating the parts used are rated at the working pressure or better.