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Started By
Message
adjusting pressure reducing valve has no impact
Posted on 7/30/23 at 9:43 am
Posted on 7/30/23 at 9:43 am
I'm installing an irrigation system and I decided to go ahead and replace the PRV while I have everything dug up. With the old one, taking the adjustment screw all the way down or all the way out had zero impact to either static or dynamic pressure.
I just got the new one in, and the same damn thing is happening (no pressure change). This PRV was returned, but I figured some DIYer just bought the wrong size or something. The adjustment screw is kind of loose and water leaks out of the bell. Shouldn't the spring be pushing against the adjustment screw? Now I'm thinking maybe some a-hole bought this one, took out the parts he needed to rebuild his, then returned it?
That, or I'm retarded and I'm somehow adjusting this wrong. This is the model LINK
am I missing something? I'm reading the pressure at the hose bib, if that matters.
I just got the new one in, and the same damn thing is happening (no pressure change). This PRV was returned, but I figured some DIYer just bought the wrong size or something. The adjustment screw is kind of loose and water leaks out of the bell. Shouldn't the spring be pushing against the adjustment screw? Now I'm thinking maybe some a-hole bought this one, took out the parts he needed to rebuild his, then returned it?
That, or I'm retarded and I'm somehow adjusting this wrong. This is the model LINK
am I missing something? I'm reading the pressure at the hose bib, if that matters.
This post was edited on 7/31/23 at 11:05 am
4
Posted on 7/30/23 at 1:30 pm to el duderino III
By PRV you mean backflow preventer?
Posted on 7/30/23 at 6:15 pm to el duderino III
What pressure are you going from and what is your target pressure. That device only works between 25-75 psi.
Posted on 7/30/23 at 9:59 pm to humblepie
The way I read it is it only adjusts the pressure 25-75 psi. It states it has a MOP of 400 psi.
I agree though, let’s start with a)where are taking pressure readings.
I agree though, let’s start with a)where are taking pressure readings.
This post was edited on 7/30/23 at 10:06 pm
Posted on 7/30/23 at 10:54 pm to good_2_geaux
The main water line in most cities is usually around 40 psi. So you can only "adjust" the pressure from 40 down to 25 psi.
It is my understanding, that an irrigation system needs lots of water and at least 40 psi to preform well.
I wonder why is there a pressure relief valve? What purpose does it serve? Do you have at least a 1" diameter line to supply the irrigation system?
It is my understanding, that an irrigation system needs lots of water and at least 40 psi to preform well.
I wonder why is there a pressure relief valve? What purpose does it serve? Do you have at least a 1" diameter line to supply the irrigation system?
This post was edited on 7/30/23 at 11:04 pm
Posted on 7/31/23 at 8:13 am to el duderino III
A pressure relief valve if not the same thing as a pressure regulating valve. A relief valve will give the line "relief" in the even the line is over pressured. Sometimes called a "pop off" it will usually vent the fluids to the atmosphere until the pressure gets lowered below the set point or the valve is reset.
A regulating valve will reduce pressure downstream of the valve, usually by having a decreased diameter, which in turn will reduce pressure and flow rate downstream.
A regulating valve will reduce pressure downstream of the valve, usually by having a decreased diameter, which in turn will reduce pressure and flow rate downstream.
Posted on 7/31/23 at 11:42 pm to el duderino III
PVB - pressure vacuum breaker, what you see on every residential/commercial irrigation system in America. One of the most basic forms of backflow prevention.
PRV - pressure reducing valve, very common in CA where they have city mains near 100 psi and reduce it to 60 psi at the house. Not at all common in Louisiana unless the system is on a booster pump.
Neither should ever be installed below grade.
Alot of those PRV's are bad from the factory, cheaply made garbage that take 2 or 3 to swap out one that works. Mind numbing when they come with a "FACTORY TESTED" sticker and clearly don't work.
PRV - pressure reducing valve, very common in CA where they have city mains near 100 psi and reduce it to 60 psi at the house. Not at all common in Louisiana unless the system is on a booster pump.
Neither should ever be installed below grade.
Alot of those PRV's are bad from the factory, cheaply made garbage that take 2 or 3 to swap out one that works. Mind numbing when they come with a "FACTORY TESTED" sticker and clearly don't work.
This post was edited on 7/31/23 at 11:43 pm
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