If you ever need to disassemble a 2P025-08 Solenoid Valve, here’s a step by step pictorial.
The assembled valve looks like this
First thing to note is that the valve actually is two major components. The coil and the valve mechanism. You can safely remove the coil even while the valve itself is connected to the water supply and under pressure. Removal of the coil by itself will not cause the water to flow and will not cause the valve to leak water.
Remove the top nut to remove the coil
For the following steps are disassembling the valve itself. For this you need the water turned off and even then you will get a slight amount of water out of the system when you take the valve apart.
Here, note the two screws holding the metal plate on. We will remove these to disassemble the valve.
Now remove the two screws.
Now remove the metal plate.
Now with a twisting motion, grab the valve stem and pull it upward.
The valve with the stem removed.
Now the stem itself can be disassembled(and cleaned). Note that the plunger (with the spring) should just fall out of the stem.
Observe inside the stem and the surface of the plunger and clean any trace of foreign objects.
After ensuring that all internals of the valve mechanism are free of foreign objects (grit, bits of sand, etc) reassemble by following these instructions in reverse. When reinserting the valve stem into the black plastic valve body, again use a slight twisting motion. When pushed in sufficiently, the O-ring should almost be flush with the top of the black plastic valve body. Then reinstall the metal plate and continue with the assembly.