In the last Picture you can see the return line Tee and Banjo bolt, the Banjo bolt threads into the FPRV. To remove the FPRV undo the 10mm strap holding it in place and hold the FPRV with a 24mm wrench while removing the banjo bolt in the return line Tee with a 19mm wrench.
Here is a pic of it removed.
Now to Take it apart you will need a 5mm Allen wrench and a vice, or something comparable.
Thh contents are spring loaded so be careful when taking the FPRV apart.