I replaced the pressure valve on the pressure tank. The tank pressure reads 38 psi. The new pressure valve reads 20 psi with no water running. open the faucet it drops to 18 psi,kicks in to 50 psi?

Yep, it should be. Try it and see if what you were told happens. If someone knows all about your exact system, it seems best to take their advice.

2,000Liters. 1,250 liters divide by .625 (the present content of the tank) = 2,000 liters.

Replace it. It's not a serviceable part, and should never be tampered with.

Use a turkey blaster or a syringe on the end. Anything that can pull a slight vacuum on the end should start the flow of water. Make sure that there...

Air in the pipes makes them bang.

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Did you lose the large black O-ring? If the O-ring is missing, or if it's getting hard, then you will have a flood.

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