Water pressure

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Water pressure
Author: Tomlynn (NC) My plumber just installed an expansion tank to stop the pressure relief valve from leaking on the hot water heater.now my water pressure at all faucets starts out at 70 psi and drops to 50 psi. Any suggestions?
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Re: Water pressure
Author: packy (MA) piping is undersized???
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Re: Water pressure
Author: hj (AZ) Either the pressure reducing valve is sticking so it cannot allow full flow, or it is leaking and allowing the pressure to rise. OR the expansion tank was not installed properly. It depends on what happens AFTER you turn the faucet off, and what the incoming pressure is.
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Re: Water pressure

Author: SHEPLMBR70 (VA)

Did he install it on the cold side? The pressure relief valve is designed to let off excess pressure built up by water heater. The expansion tank on the water heater should not cause a problem. But just for giggles check the pressure in the tank. And if you hit the air valve and water comes out, then it's bad. Also have to be careful that the proper tank is installed. I work for a wholesaler and I have seen where people have tried to install ones for boilers on water heaters.

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Re: Water pressure
Author: Tomlynn (NC) The incoming pressure is 90 psi.
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Re: Water pressure
Author: SHEPLMBR70 (VA) Wow that's high. Be careful, will eventually blow the seals etc. in your faucets
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Re: Water pressure
Author: Tomlynn (NC) The pressure beyond the pressure reducing valve is set at 70 psi and the same at the expansion tank. We have fluctuating pressure at the faucets, starts at 70 and drops to 50 psi. We suspect the pressure reducing valve needs replacing. Or can we replace the diaphragm ?
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