Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 13 of 13

Thread: Valve arrangement

  1. Back To Top    #1

    Join Date
    May 2015
    Location
    Chester, Md
    Posts
    8

    Valve arrangement

    I'm new to the forum. I have had a pool for 9 years. I open and close it myself. One thing that bothers me about the pool is the spa drains back to the return nozzles on it every evening when pool pump shuts off. Looking at the valve arrangement there is a two way valve inline from the heater that then goes to a thruway valve one side pool return and other side spa return. If I close the spa return the spa does not drain. However, I like to leave it half open to have water spill over the spa into the pool. I was wondering what purpose the two way valve serves as I have never used it. If I did I think it would close all water going to returns so why is it there? It would be easy to take it out and put a check valve in. Does anyone have an idea why this would not be ok?

  2. Back To Top    #2
    jrs_diesel's Avatar
    Join Date
    Aug 2014
    Location
    League City, TX
    Posts
    215

    Re: Valve arrangement

    That three way valve sounds like it allows you to send hot water to either the pool, the spa, or both. I'd leave it in place and just add a check valve after the three way. Use a flapper type of check valve from Jandy or Pentair. The flapper types have less restriction than the spring loaded ball type check valves and are easily rebuildable if problems arise.
    J.R.

    20K IG gunnite pool
    2HP Hayward single speed pump
    Cartridge filter

  3. Back To Top    #3

    Join Date
    May 2015
    Location
    Chester, Md
    Posts
    8

    Re: Valve arrangement

    Quote Originally Posted by jrs_diesel View Post
    That three way valve sounds like it allows you to send hot water to either the pool, the spa, or both. I'd leave it in place and just add a check valve after the three way. Use a flapper type of check valve from Jandy or Pentair. The flapper types have less restriction than the spring loaded ball type check valves and are easily rebuildable if problems arise.
    I probably did not make myself clear. The three way is for spa or pool return or combination. There is a two way before the three way which I have never used. I always wondered if I closed it how would water get to the returns. Just don't understand why it is there. Would like to remove it and put a check valve in its place.

  4. Back To Top    #4
    jrs_diesel's Avatar
    Join Date
    Aug 2014
    Location
    League City, TX
    Posts
    215

    Re: Valve arrangement

    That sounds a little odd. Can you post a picture of your valves? That will help make it easier to figure this out.
    J.R.

    20K IG gunnite pool
    2HP Hayward single speed pump
    Cartridge filter

  5. Back To Top    #5
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Valve arrangement

    The check valve needs to be on the spa return line after the 3 way.

    No idea why a shut off valve would be before the 3 way.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  6. Back To Top    #6
    jrs_diesel's Avatar
    Join Date
    Aug 2014
    Location
    League City, TX
    Posts
    215

    Re: Valve arrangement

    Isolate the heater, maybe?
    J.R.

    20K IG gunnite pool
    2HP Hayward single speed pump
    Cartridge filter

  7. Back To Top    #7

    Join Date
    May 2015
    Location
    Chester, Md
    Posts
    8

    Re: Valve arrangement

    Quote Originally Posted by jrs_diesel View Post
    Isolate the heater, maybe?
    Here is a picture. Note the two way from heater. I'd like to just take it out and put in a check valve to keep spa full when pump off. If someone has a better place let me know.
    Attached Images Attached Images

  8. Back To Top    #8
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Valve arrangement

    The gray two way valve between the heater and the black three way valve is only useful if your equipment is below water level. Otherwise is serves no purpose.

    Putting a check valve in place of the two way valve won't help anything. The spa will still be able to drain down into the pool when the pump is off. Water will simply run backwards through the spa return, the black three way valve and into the pool return pipe.

    The gray 90, just to the right of the black three way valve looks very much like a check valve. From what I can see, it even has a cover that comes off to allow servicing.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  9. Back To Top    #9

    Join Date
    May 2015
    Location
    Chester, Md
    Posts
    8

    Re: Valve arrangement

    That is a tee with a cap going to spa return line. I have never taken the cap off. Maybe it is a check valve and it is broken. I will take it off. Draining back makes sense now that you mentioned it. Thanks I see the check won't work where the two way is now. Not sure what I can do if the tee is not a check valve. There is only about 6 inches of two inch pipe above ground under the tee unless I could bring pool and spa return up about 10 inches, put the check on the vertical 2 inch spa return and still have a small pitch from heater to the three way. I'm not sure if Jandy checks work in vertical.

  10. Back To Top    #10

    Join Date
    May 2015
    Location
    Chester, Md
    Posts
    8

    Re: Valve arrangement

    Quote Originally Posted by peteb48 View Post
    That is a tee with a cap going to spa return line. I have never taken the cap off. Maybe it is a check valve and it is broken. I will take it off. Draining back makes sense now that you mentioned it. Thanks I see the check won't work where the two way is now. Not sure what I can do if the tee is not a check valve. There is only about 6 inches of two inch pipe above ground under the tee unless I could bring pool and spa return up about 10 inches, put the check on the vertical 2 inch spa return and still have a small pitch from heater to the three way. I'm not sure if Jandy checks work in vertical.
    Looked at outside cap and it is a purex pool equipment and I believe it is a check valve. I'm going away for the holidays and will remove cap when I get back. I'm guessing the mechanism is still in there and not working. I have had spa drain down for 10 years and have asked a couple of pool companies when they were here one time to replace pump and another time to fix a leak if they could put in a check valve and they said they would get back with me which they never did. I guess they did not know that was what was
    Installed. Thanks so much you know more then either of them. I did get sticker shock looking it up and price is $107.

  11. Back To Top    #11

    Join Date
    May 2015
    Location
    Chester, Md
    Posts
    8

    Re: Valve arrangement

    Jason,

    Thanks for your help.

  12. Back To Top    #12

    Join Date
    May 2015
    Location
    Chester, Md
    Posts
    8

    Re: Valve arrangement

    Jason,

    Maybe you can help me. I pulled the cap off the tee and it is a check valve. However water poured out. I closed the valve to the spa return and it stilled poured out. I will lower spa today lower then nozzles and keep the valve closed. I think that will work. However because I have a small crack in the spa return line I need to change the 3 way, elbows, and the check. When I do how do I stop the pool return from backing water up its line. Do I need to plug them like in winter closing?

  13. Back To Top    #13
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Valve arrangement

    The water coming out of the check valve is probably coming from the spa.

    To do plumbing repairs, the simplest thing to do is to drain the pool and spa so both are below the height of the plumbing you want to work on. Typically all that needs to be done is to drain the spa into the pool and drain the filter back into the pool and you will be good. However, if the equipment is below the pool water level more draining than that is required, and it might be simpler to plug the pipes as if winterizing.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •