Good day. I have a PRV set at 80 psi; from what I know PRV sets a limit to incoming water before entering the internal piping of the home and at the same time maintain a constant pressure going into the pipes; Correct me if I'm wrong - if you set it at 80 psi, is that 80 all throughout the internal piping? Or the pressure will drop if you turn a faucet ON. The thing is, I have also a pressure valve connected after the PRV(with the meter) and when no one is using the pressure is at 80psi, then when you open a faucet it drops to 60 psi and this is just 1 faucet. Adding more you will see less water flowing on the second faucet.
Thanks for the guidance.

what you describe is more related to volume (pipe size) rather than pressure.
simply put.. if you have a 1000 gallon tank at 80 PSI and you open a faucet attached to it, the pressure will drop slowly but if it is a 10 gallon tank the pressure will go down rapidly.

@Packy - I appreciate the information. Going forward, what must I do to have a stronger water flow throughout the house? If I were to open more than 1 faucet. Thanks.



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It depends on the PRV, and its flow capacity. Some have a limited flow so almost any draw will reduce the pressure, and as the flow increases the pressure decreases. Other, better quality valves will maintain the pressure, or have a slight drop under "normal' flows.

I'd be curious as to what the pressure, on the city side of the PRV does.

@hj/@Paul48- thanks for the feedback.
I believe the city supplies more than a 100psi (normally); the current setting is 80psi on the valve but I will see the pressure meter read 70 or 68 at times even when there is no usage. I have read that the minimum flow through a water pressure reducing valve should be 10% to 15% of the maximum flow rate desired in the system. I was think maybe if I can set the valve to 85 or 83, will bring a satisfactory performance.



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This goes back to what has been said......There is a difference between pressure and flow. You can have 80 psi on a 1/4" pipe and a 3" pipe. Obviously the flow through each would be drastically different. If the pressure on the city side drops of when you are using water, you may be between a rock and a hard place.

What size is your water main? How far from the meter is the home? At 80 PSI, it sounds as if you are undersized with your water lines. If you have the correct size piping and the pressure is constant at 80 PSI from the city, you should get plenty of water. My pressure is set to 65 PSI for my copper pipes here in San Diego Area. I might add that you should not have over 80 PSI on your home because it is not good for your Dish Washer or Clothes washer.