Backflow (1/2" Watts 009QT) spraying water from the top - Plumbing Zone - Professional Plumbers Forum
CLICK HERE AND JOIN OUR COMMUNITY TODAY, IT'S FREE!

Go Back   Plumbing Zone - Professional Plumbers Forum > Professional Plumbers Forum > Commercial Plumbing


Like Tree24Likes
Reply
 
Thread Tools Display Modes
Old 03-04-2020, 12:54 PM   #1
Junior Member
 
Join Date: Mar 2020
Posts: 11

View Expo Engineer's Photo Album My Photos
Default Backflow (1/2" Watts 009QT) spraying water from the top

I'm relatively new to the world of backflows having just completed my tester certification course last year. I have a 1/2" Watts 009QT RP assembly that is spraying water from the little nipple in the middle of the top cap above the relief valve piston. I opened it up, found a broken piston O-ring (the red one that goes on the plastic piston itself). I replaced that O-ring but it still sprayed water. I then bought a relief valve rebuild kit and installed it but the same thing is happening. Is the little nipple on the top of the cap supposed to be open (air vent, etc)? If so what seals it so it doesn't spray water? There's also a slight dent in the cap below one of the 4 slots at the bottom of the cap (I have no idea how that happened). Could that be causing the leak? I tested this device 4 months ago and it tested ok. Help!
Expo Engineer is offline   Reply With Quote

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. PlumbingZone.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

Sponsored Links
Advertisement
 
Old 03-04-2020, 12:58 PM   #2
Senior Member
 
ShtRnsdownhill's Avatar
 
Join Date: Jan 2016
Location: Long Island, NY
Posts: 8,485

View ShtRnsdownhill's Photo Album My Photos
Default

Quote:
Originally Posted by Expo Engineer View Post
I'm relatively new to the world of backflows having just completed my tester certification course last year. I have a 1/2" Watts 009QT RP assembly that is spraying water from the little nipple in the middle of the top cap above the relief valve piston. I opened it up, found a broken piston O-ring (the red one that goes on the plastic piston itself). I replaced that O-ring but it still sprayed water. I then bought a relief valve rebuild kit and installed it but the same thing is happening. Is the little nipple on the top of the cap supposed to be open (air vent, etc)? If so what seals it so it doesn't spray water? There's also a slight dent in the cap below one of the 4 slots at the bottom of the cap (I have no idea how that happened). Could that be causing the leak? I tested this device 4 months ago and it tested ok. Help!

do a proper intro on your qualifications to be on this forum or you will get NO answers and your balls broken....
mtfallsmikey and skoronesa like this.
__________________
You cant cure stupid, only kill it..
ShtRnsdownhill is offline   Reply With Quote
Old 03-04-2020, 01:36 PM   #3
Senior Member
 
mtfallsmikey's Avatar
 
Join Date: Jan 2010
Location: Mt. Falls Va.
Posts: 434

View mtfallsmikey's Photo Album My Photos
Default

Quote:
Originally Posted by ShtRnsdownhill View Post
do a proper intro on your qualifications to be on this forum or you will get NO answers and your balls broken....

Yes, please do an intro. I see you're a building engineer, like me, but I'm a 3rd gen. plumber first and foremost.
mtfallsmikey is offline   Reply With Quote
The Following User Says Thank You to mtfallsmikey For This Useful Post:
Tommy plumber (03-06-2020)
Sponsored Links
Advertisement
 
Old 03-04-2020, 01:42 PM   #4
Moderator Wizard
 
Tango's Avatar
 
Join Date: Jan 2018
Location: HACK LAND
Posts: 7,037

View Tango's Photo Album My Photos
Default





You will need to fill in an introduction


Are you an employee, apprentice, journeyman, business owner?

Tell us if you had to go to trade school. How long?

How many hours or steps(1/2/3/4) before you become a journeyman?

What trade certificate do you have, plumbing, gas, oil, pipe fitter etc? How did you get them, exams, courses, or free in a cracker jack box?

What about your recent jobs, describe what you actually do and what type of building : houses, high rises, commercial building, institutional, oil refineries, paper mills etc.

Tell us about you, some funny plumbing jobs and or horror stories.

Intro page :

https://www.plumbingzone.com/f3/


.
Tango is offline   Reply With Quote
The Following User Says Thank You to Tango For This Useful Post:
breplum (03-05-2020)
Old 03-06-2020, 09:39 AM   #5
Senior Member
 
Alan's Avatar
 
Join Date: Jun 2008
Location: California
Posts: 1,401

View Alan's Photo Album My Photos
Default

Quote:
Originally Posted by Expo Engineer View Post
And BTW I contacted Watts tech support to get the answer to my original question and reason for coming to this forum. Turns out that the 009QT RP should have been installed with a check valve to prevent downstream hammering. Wasn't actually a problem with the device.
I certainly wouldn't be one to argue with WATTS, but it seems kind of crazy to me that you would need to add another check valve to a device that already has two in it. If you have a water hammer issue wouldn't you install a device to manage that symptom instead of just putting something in front of the RPZ to keep it from 'seeing' the water hammer?

I might be misunderstanding the actual problem anyway.
ShtRnsdownhill likes this.
__________________
Journeyman Plumber
Alan is offline   Reply With Quote
Old 03-06-2020, 05:27 PM   #6
Junior Member
 
Join Date: Mar 2020
Posts: 11

View Expo Engineer's Photo Album My Photos
Default

Quote:
Originally Posted by Alan View Post
I certainly wouldn't be one to argue with WATTS, but it seems kind of crazy to me that you would need to add another check valve to a device that already has two in it. If you have a water hammer issue wouldn't you install a device to manage that symptom instead of just putting something in front of the RPZ to keep it from 'seeing' the water hammer?

I might be misunderstanding the actual problem anyway.
Per the Watts tech I put in a $66 (from $Fergu$on$) spring check AFTER the device. He was thinking the fast closing water solenoid in the ice machine was causing the problem. It seemed ok initially but today I checked and it's still leaking. Back to square 1. I'm gonna go through another RP test procedure to make sure the internal checks aren't fouled. I would think if one of those checks is bad it would leak all the time. I have other backflows in the same area & they don't do what this one is doing.
Expo Engineer is offline   Reply With Quote
Old 03-06-2020, 06:54 PM   #7
Senior Member
 
Join Date: Nov 2015
Posts: 426

View Toli's Photo Album My Photos
Default

The check valve for a supposed to stop a water hammer and a sudden spike in pressure. This will cause the relief to spit but not the relief vent to leak. You’re getting water on top of the diaphragm some how.
MACPLUMB777 likes this.
Toli is offline   Reply With Quote
Old 03-07-2020, 11:26 AM   #8
Senior Member
 
skoronesa's Avatar
 
Join Date: Oct 2015
Location: East Bumfuk, Mississippi
Posts: 3,777

View skoronesa's Photo Album My Photos
Default

How much water is this thing using that the solenoid closing does that? Maybe throttle the valve down before the backflow preventer just to add some restriction, might help with the water hammer.



Sounds to me like you need an expansion tank/hammer arrestor. Just throwin that out there since check valves usually make water hammer worse and hammer arrestors are designed to limit water hammer.



Or maybe the pressure is too high and you need a prv. I usually suggest one if it's over 90. I don't like to see pressure over 75 but trying to get my manager to push one on them when it's under 90 is like pulling teeth, he just doesn't see it as that much of a benefit and doesn't like to push them.








.
__________________
Want privacy from the diy/hacks? Too bad, the motherland has fallen, freedom is dead.


"I'd rather have Questions that can't be answered, than Answers that can't be questioned"
skoronesa is offline   Reply With Quote
The Following User Says Thank You to skoronesa For This Useful Post:
Expo Engineer (03-09-2020)
Old 03-07-2020, 04:34 PM   #9
Senior Member
 
ShtRnsdownhill's Avatar
 
Join Date: Jan 2016
Location: Long Island, NY
Posts: 8,485

View ShtRnsdownhill's Photo Album My Photos
Default

Quote:
Originally Posted by Expo Engineer View Post
I'm relatively new to the world of backflows having just completed my tester certification course last year. I have a 1/2" Watts 009QT RP assembly that is spraying water from the little nipple in the middle of the top cap above the relief valve piston. I opened it up, found a broken piston O-ring (the red one that goes on the plastic piston itself). I replaced that O-ring but it still sprayed water. I then bought a relief valve rebuild kit and installed it but the same thing is happening. Is the little nipple on the top of the cap supposed to be open (air vent, etc)? If so what seals it so it doesn't spray water? There's also a slight dent in the cap below one of the 4 slots at the bottom of the cap (I have no idea how that happened). Could that be causing the leak? I tested this device 4 months ago and it tested ok. Help!

did it spray from the time you put it in? or is it an older existing unit?
__________________
You cant cure stupid, only kill it..
ShtRnsdownhill is offline   Reply With Quote
Old 03-09-2020, 01:38 PM   #10
Junior Member
 
Join Date: Mar 2020
Posts: 11

View Expo Engineer's Photo Album My Photos
Default

The weird thing about this situation is, as far as I know, it just started spraying from the vent only recently. I think the ice machine and the backflow have been in place for over 15 years. When I first looked at it I found the red O-ring broken, replaced that with same results. Also same results after replacing the relief valve piston. There are other devices on the same water feed and they're not having any issues as far as I know. Per the gauge on the filter assembly the water pressure is 80-85psi.
Expo Engineer is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 10:10 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Our Pro Sites Network
ContractorTalk.com | DrywallTalk.com | ElectricianTalk.com | HVACSite.com | PaintTalk.com | RoofingTalk.com