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Author:
XrayDoc88 (CO)
My home has a PRV installed in the water meter pit and another identical unit in my basement. My static water pressure was about 38-41 psi. Sprinkler pressure was terrible. I then fully opened the water pit PRV to maximum (Supposedly 75 psi) and increased the pressure in the basement PVR so my static pressue is about 68 psi. Sprinkler pressure is definitely better, but it still seems low. Would having the two PVRs in tandem decrease my flow even though the first PVR is fully open? Would I possibly see better flow (or dynamic pressure) if I removed the PRV in my basement and just did pressure adjustments using the single water pit PRV?
I don't know if this information will help but I did the following test with my pressure meter:
Static - 68 psi
Laundry faucet full open - 47 psi
Add one bathroom facet full open - 44 psi
Add second bathroom facet full open - 40 psi.
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Author:
m & m (MD)
Tandem PRV's are typically installed on extreme pressure conditions where the primary device steps down the pressure to a certain level and the secondary device hits the target pressure. Possibly the irrigation branch is between the two PRV's? You could try increasing the static slightly more and see if that improves the dynamic. Another factor in the delivery game is pipe friction loss.
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Author:
XrayDoc88 (CO)
No, the irrigation branch is after both PRVs. I don't think we have really high pressures. I honestly think my builder was just an @#$%&, or used two different plumbers who didn't know what the other had done.
Would the second PRV add flow resistence by itself (i.e. unnecessary extra pipe resistance)? My sprinkler output in the back yard, (farthest away from the water source) still seems low despite the static pressure measuring 68 psi on a spigout close to the front of the house.
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Author:
steve (CA)
Have you checked dynamic pressure with rear sprinklers running?
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Author:
hj (AZ)
If the existing one is bad/defective putting another one in series with it will NOT make it better.
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