I am installing a sprinkler system and my well pump and pressure tank is just a tad under sized. I think I will lose too much psi. Would a csv valve help me with this problem? The valve sounds to good to be true. Whats the loss? Gpm on your flow? Could this work for me or do I need to shell out the $3,000 to go to a larger system. I cant afford any gpm loss. I have a 10 gpm 3/4 hp pump at 110' and Im gettin 12-15 gpm. Just wondering while I'm at it, my 1" copper pipe I put in running from my pressure tank out side has a big bang when I shut the shut off off. I think a air hammer will take care of this but does it go before or after the shut off??