glue white pvc onto grey

[bbxrider]

see pic, I need to put a pressure regulator after the irrigation valve, there is a section of grey pvc where it will go. I have to glue on some male nipples for the regulator and looks like I'll need a union to be able to make it fit in.
I saw post that said not to clean the grey with the purple cleaner, yes? is that right? And I was hoping I can just use my standard grey color pvc cement. do I need to do anything different or special where the grey pvc is being glued to the white pvc or just use the grey color pvc cement

 

[Titaniumplumber]

Yes if it's the gray medium cement its approved all classes of pvc

 

[Mr_David]

The gray PVC pipe is usually sch 80, which is just a thicker higher pressure rated pipe. You can use most types of PVC solvent weld on it in combination with white PVC sch 40 pipe.

As for the PRV use a double union with IPS union adapters for easier installation.

ODD I went to go get a link for a Zurn- Wilkins 70XLDU (lead-free Double Union) and it looks like they are discontinuing them.

 

[speedbump]

I have a question that may sound dumb. Why put the PRV after the solenoid valve?

 

[frodo]

agree speedbumb

higher pressure to the sprinkler system, then knock it down for the house


I'm not a sprinkler guy, but it would make sense to want mo pressure to the heads to water farther

 

[bbxrider]

thanks for the all replies, the prv is a requirement for a 'cash for grass' program where I'm converting my typical grass yard to drought tolerant, low water plants and lotsa deco rock like river rock, white dolomite etc, part of the program requirement is to put a 'smart' irrigation controller with drip irrigation throughout the yard. They specify to have the prv after the solenoid valve. my guess is because its drip and lower pressure means somehow lower water usage and it seems to make sense to me to have lower pressure for a drip application.
btw here's my dumb question, can anybody tell if there already is a prv there, that knob turns like a shutoff valve, it seems like it could be just a shut off valve, its a 'champion' from los angeles, I've searched champion products but there's nothing that looks like the one I have, I suppose I should just get in touch with champion. this house is 35 years old and this existing irrigation system could be close to that age

 

[Titaniumplumber]

No that's not a prv

 

[havasu]

That is a sprinkler anti-siphon valve.

 

[speedbump]

I'm still wondering why they would want to lower the pressure after the solenoid valve instead of in front of it? Is that a master valve or is it the only valve?

 

[Titaniumplumber]

I know for sure a backwater valve is needed

 

[frodo]

I know for sure a backwater valve is needed

you mean a backflow preventer right ?

 

[Titaniumplumber]

Yes you are correct backflow preventer my phone autocorrected thank you. Unless of course they sprinkle their lawn with sewage 😜

 

[frodo]

Yes you are correct backflow preventer my phone autocorrected thank you. Unless of course they sprinkle their lawn with sewage ��

eeewwwwwwwwwwwwwww!!!!! stanky stanky grass

 

[bbxrider]

the solendoid valve in the pic is for 1 zone, there are 3 other zones each w their own valve. I can ask about the prv but doubt if I will get an answer other than something like 'this is a provision that we follow we don't know what it is or why it was stipulated'
it was major event to get them to specify if the prv was before or after the solenoid valve.

I'll call rainbird or one of irrigation suppliers and see if they know

what is a backwater valve in the irrigation context? I seem to remember there are backwater or one way valves on the main water supply lines coming from the street, to keep some major fu in the house or some pressure thing to keep from contaminating the main supply.

 

[speedbump]

the solendoid valve in the pic is for 1 zone, there are 3 other zones each w their own valve. I can ask about the prv but doubt if I will get an answer other than something like 'this is a provision that we follow we don't know what it is or why it was stipulated'

So are they going to require you to put a PRV after each zone valve? That's why I asked the first question. Another thing is that I doubt that solonoid valve goes to a zone, I think it's a master valve. It's on a 1" line, and has a backflow preventer after it. I have never seen that done on any one zone valve.

 

[bbxrider]

I thought I posted this reply already but doesn't seem to be showing up.
I intend to call rainbird and get their .02 about the prv afta the solenoid valve.
my cash for grass program folks don't seem to have ans for questions like this, it took 3 go rounds to get somebody to commit to the prv being afta the solenoid valve
I thought there is always some one-way backflow preventer on the house supply line from the main in street, so if there is some major fu in the house or pressure mess-up, to keep bad stuff from getting back into the main. but not at an irrigation zone context?

 

[Titaniumplumber]

That depends are you connected to separate main for the irrigation? Or simply teed off of your house main? If you are running irrigation from the same main as your home and not a separate system you need a backflow preventer or a check valve it has nothing to do pressure it has to be installed to keep the water which is sitting stagnate in the sprinkler system from getting into the potable system