Archived from the Tools In Action forum (Pub Talk). This thread is read-only.
At work today I was at a different store and noticed some different looking fittings and valves on the water line for the hose. Just a hot water supply line used for cleaning but I’m not exactly sure what’s on it between the valve and the wall. From what it looks like they increase the pressure?
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Here’s the top view
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Jimbo
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That’s basically a fancy check valve so if the city side of the line loses pressure, there isn’t a chance that it can become contaminated with water from the service side, in the rare circumstance that it might happen. It also has a separate swing check valve probably to prevent water hammer, that can happen sometime too. Though I’m not sure why it’s on the hot line like that.. weird
That one that I thought might be a swing check could be a strainer, not sure
KnarlyCarl wrote:
1 minute ago, KnarlyCarl said:That’s basically a fancy check valve so if the city side of the line loses pressure, there isn’t a chance that it can become contaminated with water from the service side, in the rare circumstance that it might happen. It also has a separate swing check valve probably to prevent water hammer, that can happen sometime too. Though I’m not sure why it’s on the hot line like that.. weird
City of chicago store, they all seem to have them, just stopped to take a picture today because I thought about it. It is a hot water line only used to clean the meat cutting room.
Maybe they require it for that purpose, to be extra safe and have that added layer of protection
That’s an RPZ,,, Reduced Pressure Backflow Preventer..with a Y strainer in front of it to protect the moving parts from debris in the water. like Carl said its a fancy check valve.. They are used/tested a lot in NYC..but I mostly see them on cold water
You’re to fast for me Carl..lol Good to know your on top of these questions, maybe I can answer the next one before you 🙂 That is forsure a strainer on the line, I like that they used propress fittings don’t see that to much here. The bad thing I see hear is there not using proper pipe supports, zip ties are forsure not code approved.lol
Yeah Justin, ha zip ties on that is just cheap and unprofessional!
Mikey, thought this was just a dual check, not a reduced principle backflow preventer? I’m working on figuring out the differences yet, because RPZ have the intermediate relief, but this does not, just getting that straight
I noticed that, I see a lot of half ass work at various stores just because of the lack of supervision and knowledge of people that overlook the jobs I.e. Store management
Jimbo
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KnarlyCarl wrote:
14 hours ago, KnarlyCarl said:Yeah Justin, ha zip ties on that is just cheap and unprofessional!
Mikey, thought this was just a dual check, not a reduced principle backflow preventer? I’m working on figuring out the differences yet, because RPZ have the intermediate relief, but this does not, just getting that straight
Carl, your right, sometimes they look a lot alike. Found this comparison on a Google search
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What is the difference between a double check valve backflow preventer and a reduced pressure zone backflow preventer (RPZ)? Where is one used versus the other?
View answer-
Double check valve backflow preventers contain two independent check valves in one housing. Test cocks are located at strategic points so that the check valves can be tested with a backflow preventer test kit. Double check valves are used for non-health hazard cross connections in continuous pressure applications. RPZ backflow preventers include two check valves like a double check backflow preventer, but they also have an intermediate relief valve that opens to atmosphere if both check valves should fail. Because of this extra measure of protection RPZ backflow preventers are used in cross connections subject to backpressure or back siphonage where there is a potential health hazard in continuous pressure applications.
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Interesting guys!
Jimbo
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I learned something new, i always find it interesting when someone posts something like this, and I enjoy reading the responses.
JimboS1ice wrote:
Interesting guys!Jimbo
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Well then, here’s some more! I just put these in today, waiting on the two other strainers and the city to put in the water meters.
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Notice the lack of zip ties?
These are the reduced pressure backflow preventers, on the bottom, they have the intermediate vent, another layer of protection in case debris gets in their and allows water to flow backwards, that will dump it out the bottom instead.
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Here’s what the propress and copper looks like new shiny!
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Awesome stuff, this is the larger press tool of the two we have.
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The section between my pipe wrenches are just blanks so we know how far apart to install the fittings on either side, then the city will come and put the water meters in their places.
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Cool stuff guys,I learned something too,At first glance it looked like somekind of valve system but i could not have told you what type.
Sweet deal Carl very neat and organized work.
Jimbo
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Nice job Carl!! Is that a 2inch main?? Nice propress work, are you using blue monster thread tape?? Your not required to put tape on the copper to separate from the strut pipe clamps?? Sorry for the 20 questions..lol No zip ties thats sad :/
Justin Hernandez wrote:
Nice job Carl!! Is that a 2inch main?? Nice propress work, are you using blue monster thread tape?? Your not required to put tape on the copper to separate from the strut pipe clamps?? Sorry for the 20 questions..lol No zip ties thats sad :/
Yes 2″, yes blue monster tape, but I always put tape and dope on water pipe threads. Actually did cross my mind to put tape around the copper where the clamps hold it, but nobody “requires” it, I’ll see when I can get back there and will just have to do that.
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KnarlyCarl wrote:
8 minutes ago, KnarlyCarl said:Yes 2″, yes blue monster tape, but I always put tape and dope on water pipe threads. Actually did cross my mind to put tape around the copper where the clamps hold it, but nobody “requires” it, I’ll see when I can get back there and will just have to do that.
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I always use dope and tape on copper and brass, it will leak if you don’t. Experienced plumbers know you have to use both. We use pipe wrap tape that’s 10 mils thick, I really don’t know if its code here but everyone uses it and so do I. If copper is touching metal or concrete it gets taped, it is a nightmare to get if off after a few years if you have to make a repair. One more question how is the strut attached to the angle steel are you using 45 degree strut brackets??
Nevermind it looks like you just bent the steel over
Justin Hernandez wrote:
I always use dope and tape on copper and brass, it will leak if you don’t. Experienced plumbers know you have to use both. We use pipe wrap tape that’s 10 mils thick, I really don’t know if its code here but everyone uses it and so do I. If copper is touching metal or concrete it gets taped, it is a nightmare to get if off after a few years if you have to make a repair. One more question how is the strut attached to the angle steel are you using 45 degree strut brackets??
I wish I had a nice transition between the two, but I bent the angle steel to the underside of the strut. I wish I knew what was all available for installing strut, I’ve seen a few pieces designed for the unistrut but nobody around here seems to have a real good selection of pieces like that. There’s gotta be a ton of different strut clamps and hardware pieces, I just dont know where around here and none of our supply houses have ever advertised a large selection of them, so I never know what is even available to start asking for.
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They have any fitting you can dream of you just have to have a ton of channel spring nuts, bolts and washers to install them. Electrical supply houses have the most fittings, here’s 76 pages..lmao
Great work Carl!
Looks like intricate work Carl. Very nice
What is with the green strut? I’ve only used the galvanized and the yellow zinc strut. Is the green a different material, or is it just a brand thing?
WOW that’s a ton of fittings thanks Justin, I’m going to check out McNaughton-McKay electrical here now that you mention that
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Stercorarius wrote:
What is with the green strut? I’ve only used the galvanized and the yellow zinc strut. Is the green a different material, or is it just a brand thing?
It’s painted, but beside that, I’m not sure it’s intended purpose
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KnarlyCarl wrote:
13 hours ago, KnarlyCarl said:WOW that’s a ton of fittings thanks Justin, I’m going to check out McNaughton-McKay electrical here now that you mention that
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No problem, that’s what were here for to help each other out!!
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Here’s another one, this feeds a detergent dispenser, interesting though why would there be a drain line under that valve assembly?
Jimbo
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Different style of backflow preventer that I’ve seen but that drains away water if a check valve becomes fouled in that assembly and won’t stop water from going backwards, the intermediate vent will drain the water away instead. If a seal in that assembly doesn’t completely seal against backflow, the water will drain out the bottom there instead of any possibility of it going back into the city water supply. If it starts leaking out, you don’t want a mess all over the floor, so the drain pipe takes it away instead
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You should write a plumbers book with everything you know dude
Jimbo
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The more you know lol
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Way to Karl!! But you missed the tempering valve on the far right..lol It sure is an odd place to put one, just for one branch run.
Oh yah I saw that there, but the main focus was on the backflow. Chicago must be real tight on all their water codes
Can you tell what brand that is? I’ve never seen one quite like that.
Oh and I went back and finished the three backflow preventers and put tape around the pipes where the clamps are
KnarlyCarl wrote:
Oh yah I saw that there, but the main focus was on the backflow. Chicago must be real tight on all their water codesCan you tell what brand that is? I’ve never seen one quite like that.
Oh and I went back and finished the three backflow preventers and put tape around the pipes where the clamps are
Unfortunately I don’t know when I’ll be back at that store to get you a better picture, knowing Chicago there was probably some kick backs from the union job.
Jimbo
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Wow I couldn’t help with that
KnarlyCarl wrote:
21 hours ago, KnarlyCarl said:Oh yah I saw that there, but the main focus was on the backflow. Chicago must be real tight on all their water codes
Can you tell what brand that is? I’ve never seen one quite like that.
Oh and I went back and finished the three backflow preventers and put tape around the pipes where the clamps are
Good job on the tape!!, I’m going to ask my plumbing inspector on Monday to see if it is code. I think we only do it to cover are ass and to prevent electrolysis. I think thats a Wilkins ZW1070XL Aqua-Gard Thermostatic mixing valve, which is the same one I install every now and than. The only place backflows are not installed here are in residential homes, mansions have them and anything commercial are required.
Justin Hernandez wrote:
Good job on the tape!!, I’m going to ask my plumbing inspector on Monday to see if it is code. I think we only do it to cover are ass and to prevent electrolysis. I think thats a Wilkins ZW1070XL Aqua-Gard Thermostatic mixing valve, which is the same one I install every now and than. The only place backflows are not installed here are in residential homes, mansions have them and anything commercial are required.
Hey Justin do you know the brand of backflow preventer in Jimbos last pic?
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KnarlyCarl wrote:
On 3/5/2016 at 6:44 PM, KnarlyCarl said:Hey Justin do you know the brand of backflow preventer in Jimbos last pic?
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I’m not sure maybe a Watts. I should have posted this a few days ago but here’s a gate stop I made out of power strut and fittings almost ten years ago. I thought I used galvanized bolts and washers I guess it rusts away.
