I get the whole back pressuring the system part. I asked wondering if i was to tee it in right at fitting going out the hull, would the flow there be enough to dump the water without causing it to back pressure.
I have read a lot of your posts so thought maybe you would have some thoughts on that.
The restriction for the entire system is in the dump fitting in the hull.
Make this larger and smaller and it changes how much water the system can flow. That is where the biggest (besides the gate valve) pressure drop will be.
The pressure before the dump fitting is the same as system pressure, by tying in at that point, the relief would never open, the pressure on both sides would be virtually equal.
If you up sized the dump fitting, you would be defeating the need for the relief valve to begin with.
Savvy?
GT