It's actualy very simple in there.

Only 2 springs and 3 Orings.
One small to push down the solenoids core, one bigger one conical, to push the shuttle down.

First you remove the coil of the solenoid (1/8bsp thread on top).
Then you see 4 torx , but these can be undone with a flathead screwdriver, but that's not the best option.



Main thing is the shuttle. (the thing that closes the big let trough) The seals on that are very fragile.

When reassembling, don't put the main plate in reverse, then the pilot hole is blocked, and the valve won't work.