Plastic Valves for Water

Discussion in 'Isaan Homes/Gardens and Land D.I.Y.' started by Yorky, Mar 14, 2020.

  1. Yorky

    Yorky Fullritis Member

    Ten years ago I installed a 1,000 litre water tank in the back from and into which the water flow is controlled by PVC valves, viz:

    vlave postions s.jpg

    Said valves have operated satisfactorily for those ten years however, upon installing a new downhole pump I utilised the same type of valves which have since sprung leaks through the body. I've now replaced the faulty valves with steel ball valves which, luckily enough, may be installed without major pipework modification, i.e. the new valve with the fittings are longer than the original PVC ball valves.

    metal valves s.jpg

    We'll see how it goes.
     
    gotlost likes this.
  2. Surin

    Surin Surin Dinosaur

    A hell of a lot better.
     
  3. nomad97

    nomad97 Ordinary member Staff Member

    Funny you should say that because one of mine failed a couple of days ago. Started leaking through the body where the tap is turned. I changed like for like but I do like what you are suggesting. Good idea.
     
  4. Yorky

    Yorky Fullritis Member

    They are three times the price but three times buttons is still buttons.

    [฿125.00 for the valve plus a few more buttons for the plastic fittings and the thread tape - Thai Watsadu].
     
    Last edited: Mar 14, 2020
  5. Rice

    Rice Surin Founding Father

    I was told in engineering school, not to mix materials, like in this case PVC and metal. The reason being is different thermal expansion rates. It is never recommended to use plastic pipe and fittings with metallic valves since any forces or other situations can cause breakage or leaking at or near the joint. It is just introducing a weak point.
    Well that is what I was taught. In practice you will most certainly get away with it. It is not the space shuttle.
     
    Cent, Croc, mario299 and 1 other person like this.
  6. Yorky

    Yorky Fullritis Member

    Would that not include metal and PTFE (thread) tape That mixture has been the stalwart of temporary pipeline fittings since I first got in the game.
     
  7. Rice

    Rice Surin Founding Father

    The tape is an insignificant piece in the thermal mass and only serves as a sealant and thread lubricant. Now you are just being silly. o_O
     
  8. Croc

    Croc Cannot re - Member

    Duck tape ?!?
     
    gotlost likes this.
  9. gotlost

    gotlost You chose a custom title

    [​IMG]
     
    nomad97 likes this.
  10. mario299

    mario299 Surin Founding Father

    "Duck tape"...
    That quacked you up?
     
    nomad97 likes this.
  11. Yorky

    Yorky Fullritis Member

    I get dafter as I get older.
     
    nomad97 and Rice like this.
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