Water Hammer

Carbon · Sep 27, 2015

I am having problems with water hammer. I have exceptionally high water pressure in my area. I first noticed this when I bought the house 2 yrs ago. There was a bucket under the P.R.V for the H.W.T. It was always filling up. I thought it was the valve itself, so i replaced it. Kept leaking. So I bought a water gauge and installed it to see how much pressure there was. It was 75 psi +/- a few. So I bought a Red Lion RL-4 expansion tank. The h.w.t stopped leaking and I noticed my pressure dropped to a steady 64 psi. I cannot get it any lower! Do I need it lower!? Ive installed water arrestors on the lines to my washer and it still knocks the pipes when filling.

(washer is a high efficiency one, it is located approx 15 feet away from main line). I believe my system is a closed one as well because there are one way check valves on main incoming line and line feeding lawn spinklers. I also have an lawn irrigation system. It rattles the pipes too when charging sprinkler heads. Any help would be much appreciated.

Matt30 · Sep 27, 2015

Are you confusing the "prv for the hot water tank" with the relief valve? They are two totally different things and a pressure reducing valve does not come stock on hot water tanks. If you have 75psi coming in, you want a pressure reducing valve after your water meter.

Carbon · Sep 28, 2015

My fault, I didnt realize prv meant pressure reducing valve. I was using "prv" to describe the relief valve from the h.w.t. I do not have a pressure reducing valve in my system, would that lower the pressure in my system? How much pressure should be in a normal system, Ive checked and have found anywhere between 45-55 psi??