Vacuum Relief Valve? - Plumbing - DIY Home Improvement | DIYChatroom


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 08-28-2009, 07:41 PM   #1
Newbie
 
Join Date: Aug 2009
Posts: 5
Rewards Points: 10
Default

Vacuum relief valve?


I'm looking for a valve for an unusual circumstance. I have a large water tank that has a vent line running from the top. When the tank is overflowing, it uses the vent line to dispose of excess water. When the tank is drained from the bottom, it uses the vent line as an air vent.

If the vent line is blocked when the tank is draining, it will cause a vacuum that can damage the tank. I would like to install a valve on the vent line to allow emergency vacuum relief, but low pressure water still needs to flow freely in both directions past the vacuum relief valve without any leakage. I'm unable to add a valve directly to the tank and it needs to be installed on the vent line.

Is there a valve that will work and what kind is it. My vent line is 3/4, but I have size flexibility because of the tee. Will this fit my needs or will it leak?

http://www.plumbersurplus.com/Prod/Watts-Vacuum-Relief-Valve-N36-M1-3-4-(0138458)/5920/Cat/224?utm_medium=referral&utm_source=googlebase&cvsf a=63&cvsfe=2&cvsfp=5920


Hope my description is not too confusing. Thanks!

Advertisement

walker44 is offline   Reply With Quote
Old 08-29-2009, 07:25 AM   #2
Member
 
Join Date: Dec 2008
Location: Wilmington, DE
Posts: 3,118
Rewards Points: 2,000
Default

Vacuum relief valve?


I think what you are describing is a T&P(temp/pressure) relief valve, although they are usually on the side of the tank. What was in your link is not the same thing. A pic of your existing valve would help us.

Advertisement

Just Bill is offline   Reply With Quote
Old 08-29-2009, 06:40 PM   #3
Member
 
Join Date: May 2008
Location: Near Philly
Posts: 2,051
Rewards Points: 1,022
Default

Vacuum relief valve?


Does the valve need to be automatic or would manual control work? What kind of material is the overflow made from? What diameter? How is it connected to the tank? Is there a threaded elbow? Picture would help.
bob22 is offline   Reply With Quote
Old 08-29-2009, 11:29 PM   #4
JDC
Plumbing Contractor
 
JDC's Avatar
 
Join Date: Mar 2008
Location: Cincinnati, OH
Posts: 392
Rewards Points: 250
Default

Vacuum relief valve?


That vacuum relief valve in the link should work just fine. You'll just need a 3/4" female adapter to screw it in to. We are required to use them on bottom fed water heaters.
JDC is offline   Reply With Quote
Old 08-30-2009, 04:05 PM   #5
Newbie
 
Join Date: Aug 2009
Posts: 5
Rewards Points: 10
Default

Vacuum relief valve?


Thanks for the help!

Just bill: There is no existing valve because this is a DYI add on. The tank is a cold water storage tank, so temp and inside pressure is not an issue.

Bob22: The valve needs to be automatic, the overflow line is made out of 3/4 heavy duty plastic flex tubing. I was planning on inserting the valve in line with a barbed / threaded female tee.

JDC: Thanks, I was also thinking about using a standard check valve, but I think the Vacuum relief valve would work better. Do you know if the vacuum valve needs to remain vertical to work?
walker44 is offline   Reply With Quote
Old 08-30-2009, 04:08 PM   #6
GC/Master Plumber/Mech
 
Join Date: Feb 2009
Location: Hays, KS
Posts: 1,472
Rewards Points: 504
Default

Vacuum relief valve?


Are you just concerned with debrie getting into the tank?
__________________
John Wayne once said "Life is tough and it is even tougher if you are stupid"

Tempstar and Trane Dealer
Plumber101 is offline   Reply With Quote
Old 08-30-2009, 04:11 PM   #7
Newbie
 
Join Date: Aug 2009
Posts: 5
Rewards Points: 10
Default

Vacuum relief valve?


Iím not concerned about debris. Itís not drinking water and the vent has a screen to stop larger debrie from entering the tank. I will try to post pictures.
walker44 is offline   Reply With Quote
Old 08-30-2009, 05:04 PM   #8
GC/Master Plumber/Mech
 
Join Date: Feb 2009
Location: Hays, KS
Posts: 1,472
Rewards Points: 504
Default

Vacuum relief valve?


They what are you trying to accomplish that a simple 90 deg fitting won't do.
__________________
John Wayne once said "Life is tough and it is even tougher if you are stupid"

Tempstar and Trane Dealer
Plumber101 is offline   Reply With Quote
Old 08-30-2009, 05:11 PM   #9
Newbie
 
Join Date: Aug 2009
Posts: 5
Rewards Points: 10
Default

Vacuum relief valve?


Plumer101: I dont think I understand your question. a "90 deg fitting" ( i think you mean tee) would defaet the pupose of a vent line and allow water to pass where i dont want it. I need something that will allow air to pass into the system, but will not allow water to exit
walker44 is offline   Reply With Quote
Old 08-30-2009, 05:31 PM   #10
Newbie
 
Join Date: Aug 2009
Posts: 5
Rewards Points: 10
Default

Vacuum relief valve?




http://i709.photobucket.com/albums/w...r44/Vacuum.jpg
walker44 is offline   Reply With Quote
Old 08-30-2009, 05:33 PM   #11
GC/Master Plumber/Mech
 
Join Date: Feb 2009
Location: Hays, KS
Posts: 1,472
Rewards Points: 504
Default

Vacuum relief valve?


I get it now. When the tank fills you don't want water to be released when it is full.

Advertisement

__________________
John Wayne once said "Life is tough and it is even tougher if you are stupid"

Tempstar and Trane Dealer
Plumber101 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
How to diagnose gas valve problems Nestor_Kelebay How To Guides 28 10-30-2013 05:19 PM
leaking pressure relief valve on heating water boiler benjamintr HVAC 13 01-29-2011 06:32 AM
Water heater pressure relief valve confusion Flt_Simulation Plumbing 4 07-11-2009 11:02 AM
Best 1/2 inch water shut off valve. Nestor_Kelebay Plumbing 10 07-25-2008 12:16 PM




Top of Page | View New Posts