Water pressure regulator - relative or fixed/absolute reduction?

Pressure drops if you turn on a faucet or tap.
Not sure what you are trying to accomplish or information gathering purpose with the regulators and gauges. Incoming pressure is static and then goes into a hot water tank and will differ form that.

Without a model number, it's not possible to be sure.

What you are describing sounds like it regulates to 50psi. Despite being a 50psi regulator, there may be some tolerance to it, for example +/- 5psi. This is normal in manufactured parts like this. To get something that has tighter tolerances involves spending more money for a more "precise" regulator.

Further, as @Pete_Coach indicated, there will be pressure drop from your supply when you use water - if your supply pressure is quite close to the regulated pressure, it is quite realistic to see the pressure indicated on gauges to drop.

KevinM56081 wrote: ↑ Without a model number, it's not possible to be sure.

LF25AUB

What you are describing sounds like it regulates to 50psi. Despite being a 50psi regulator, there may be some tolerance to it, for example +/- 5psi. This is normal in manufactured parts like this. To get something that has tighter tolerances involves spending more money for a more "precise" regulator.

I was aiming for 50 PSI which is what it is supposed to be set for.

there will be pressure drop from your supply when you use water - if your supply pressure is quite close to the regulated pressure, it is quite realistic to see the pressure indicated on gauges to drop.

I get that but it isn't a supply pressure drop due to my usage. If I leave all water use off and let it sit, the cold water pressure varies. I used the gauges to set to adjust the regulators, and also to see how it is changing . Was just surprised to see the pressure varying. Prior to installing the gauges, I noticed flow/pressure to one outlet had increased (easy to discern because it shoots straight up) after it had dropped when I installed the regulators.

Could be how the water is supplied. I had just assumed that the water was pumped uphill (some 80m - I know where the pump stations are). Now i am thinking it is pumped to reservoirs in a few high points (~162 m ASL) which is only a few m above me, or another one 30-35m higher (the supply map seems to indicate the supply my street is connected to the reservoirs by two different lines, and the reservoirs are connected to each other.


To give an idea of scale, the map is about 4-5 Km across.

I guess it could be one of the neighbours (includes a small college, a school and a federal institution) using a lot of water. School is between the two close-together pump stations and a reservoir. College and federal institution are off another branch line on the bottom right corner.

FWIW, I know the neighbours who live ~38m in elevation below me. Hate to think what their water pressure is (water pressure increases 14.6 psi per 10m). The former neighbour who was a councillor and sat on the regional district's water board (as well as worked to get water brought to parts of the municipality prior to being elected) tells me the household supply pressure can be as high as 130 psi. The last few times I checked, it was coming in at ~65-75 psi at my house.

Being an adjustable valve, it has a spring in it. This is reasonably calibrated, but isn't a NASA grade piece of equipment. There is some tolerance and some room for error in this setting. The spring gets worked as you regluate the pressure.

Additionally, looking at cold water for example - the 5 degree celcius water passes through the valve and is regulated to 50psi. You don't use cold water while you are at work, so over that 8 hours the "regulated" water has a chance to warm up to room temperature (or very close to it). When it warms up, the pressure increases on the regulated side of the valve. Due to the fact that the city pressure is at least 65psi as you indicated, it can't flow back, so some pressure is built up in excess of your 50psi setting.

I don't feel that the capabilities of the infrastructure outside your home have anything to do with it as you have installed a pressure regulator already.