Can you add specifically what you seek please?
The HPFP has 'one' gold(brass) valve....the outlet valve (red circle).
It also has a fuel rail pressure regulator valve pointed to (yellow arrow).
The "RS4 - fuel rail pressure limiting valve" is attached to the fuel rail, is not mounted onto the HPFP, and it opens when there is too much fuel rail pressure....thereby relieving the rail of excess pressure, and returning fuel to the low pressure delivery side.
HPFP valves:
RS4 rail pressure limiting valve: