If I recall after we ran the line from the road, the pressure was in the 70's. It's good pressure which I don't want to lose, but didn't really think it was too high. Wouldn't I constantly have issues with it if it was too high pressure? I questioned the plumber on the expansion tank and he just gave me the bs about not being required that the valves have been working for years and he would put one on if I wanted just going to be more expense for me, blah, blah, blah.

I have just wiggled them and they work just fine other times I've had to replace them. That's one thing that never caused me a big problem working at a apartment complex

It’s gonna take a lot more than 70psi to set that valve off. Unless it’s gone weak.

Has it still been spitting out water? Or did it stop?

Water hammer is a real thing. When I was in the fire service we tested hydrants. You had to turn each one on very very slowly and back off again just as slow. If you didn't, you'd damage homes all up and down the street. 70 psi operating pressure turned on too hard could absolutely cause water hammer enough to let a small amount of water from the pressure relief valve. Most are 180psi/210 degrees F.

No water coming out since the initial episode on Thurs. I’d say it was maybe 3-4 cups of water that was on the ground.

Yeah i always turn faucets on at camp, and let all air out i can before turning breaker on