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  1. J

    Water heater pressure and a back flow valve

    Was the TERV (yellow handle closed) while taking reading of WH pressure? Yes...and as long as it stayed closed the pressure didn't spike back up. 70 psi on the cold or hot side??? I was reading the pressure at the water heater. Did you adjust the PRV back up? Yes I adjusted it back up...
  2. J

    Water heater pressure and a back flow valve

    I'm uploading some pictures of the situation. I need to go and get a second guage to run the test you described. But in the mean time, here are the images of the heater, the thernal expansion relief valve, the pressure relief valve and the pressure regulator. There is a shutoff on the TERV...
  3. J

    Water heater pressure and a back flow valve

    A Wilkins Model 70 pressure regulating valve. Simple bolt valve (25-75psi) range.
  4. J

    Water heater pressure and a back flow valve

    The valve on the cold water in to the water heater is not a back flow prevention, it is a thermal expansion relief valve (TERV) set to 80psi. As a test, I turned the pressure down on the main line down about as low as it could go...water trickling out of faucets upstairs. The pressure in the...
  5. J

    Water heater pressure and a back flow valve

    I have a water heater that has both a pressure relief valve and a back flow prevention valve (BFP). It seems that the BFP (which is an 80psi) is continuously running. I checked the pressure in the hot water heater and it is 90psi (all the time) which makes sense why the 80psi valve is always...
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