I am stuck. Any help is appreciated.
We have had an old regulator which according to various plumbers who have done work on our toilets needed replacing. However, the water flow has been low, when we turn on one faucet or flush a toilet the shower pressure drops or vice versa.
I checked the water pressure by buying a gauge and attaching to the garden hole bib and inside to the dish washer inlet. The pressure read 140 psi (static pressure)! I confirmed this with a second gauge which confirmed the first reading. When a faucet was turned on then the pressure dropped to about 40 or lower.
So, I got a new regulator after trying to adjust the pressure using the old regulator with no luck. In fact I opened up the old one and noticed the diaphram was very hard and obviously not doing its job.
When I put in the BRAND new regulator I measured the pressure again and it was again 140 psi (static) , even though the regulator high end control range is75 psi!! I tried to adjust the pressure again and it was still 140 psi (static) no matter where I put the adjustment screw! The pressure with a faucet on was about 30 psi and it did not change now matter where I put the adjustment screw.
One can say the new regulator is also bad, but now the flow is far more reduced to a point that we get just a dribble out of some of our faucets when say we flush a toilet.
Our house in only 16 years old and it does have copper piping.
I just don't understand why the pressure is still up at 140 psi (static) but the flow is so much lower. And that the pressure does not change with adjustment screw. Can this resulator be also bad, which I just got out of the box ordered from plunber's surplus?
Am I doing this wrong?
Thanks, Abbas

Ok file this under never trust a plumber (with all due respect to all good plumbers).
The regulator was put on backwards when it was installed by the plumber (they had put in a new one but backwards). So, I was going by what they had done. Finally, I decided to check the water flow direction and the old regulator had been put on backwards and I was going by that. When backwards, it apparently does not regulate at all and also leads to reduced flow (i have not had time to check why this would be).
Flipping the regulator around solved the mystery I wrote about. Of course, some may have been quick to say it was the old pipes but I knew it was otherwise.
Thanks anyhow, Abbas