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If there is that much gunk in there, it could block proper fliud flow and prevent then lock on everything.
With that much stuff floating around, you do need to get the large filter plug out and clean or replace the filter. I have a feeling there is no filter in place or it has been damaged.
You also will need to get the PRV seat out. If there was stuff in the valve top, there is probably more in the top of the valve prior to the dump slot.
Since it is stuck so well, a bit of force will be necessary. Spray some PB Blaster or similar up partially through the center hole, attempting to get the end of the tube stopped in the hole in the side of the valve seat. Also spray around the bottom of the seat at the edges of the bore. It will provide some lube as you pull the valve down.
Find a poultry lacing kit at he hardware store or supermarket. The Stainless Steel skewers have a nice right angle bend and the metal is a lot stronger than any wire or small picks you have in the shop. get the hook end up into through the hole, you may have to grind a bit off the end to get it to fit, then follow with a round screw driver shaft or 1/4 inch wood dowel to hold it in place. Grab both skewer and holder with a vise grip which you can then lever down or drive with a small impact tool.
Also, ther is a small passage between the bottom of the PRV area and the solenoid. Internal to this "large" hole is a small plug with a pin hole used to meter flow rate. With the amount of stuff at the top of the valve, I am pretty sure this is plugged which is preventing the OD from releasing to off. blow through from the solenoid side to the valve.
Duane
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