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Hi guys, wondering if you could shed some light on this problem I am having. It is a renovated boiler room from an old 1967 C.I. boiler to a new Weil-Mclain. As you can see from the drawing this is what it looks like now. The original set up was without the Pressure Bypass Valve and compensator. Both Z.V. are pointing in the proper flow direction and the expansion tank is new (Amtrol 30). If you have any suggestions on how to stop the noise it would be greatly appreciated.