DIY water system forced drain down

Discussion in 'Tech/Mech General' started by Techno, Feb 3, 2014.

  1. Techno

    Techno Funster Life Member

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    After investigating a branded drain down system I discovered it would cost me £54 for the kit to do European motorhomes with flexible pipework :Eeek:

    So I made my own for about £16 :Cool:

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  2. chaser

    chaser Funster

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    Have somthing very similar on the overflow on the water tank , used to start off with a full tank but when we got to site, found a large amount of it had swilkered out of the overflow so got a garden inline hose pipe tap at pound land and put it on the overflow pipe because if you block it up you get blowback and difficulty filling , so turn it on till the tank is full then turn it off, result, full tank when you park up:thumb::thumb::thumb:
     
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  3. Techno

    Techno Funster Life Member

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    Home made inflater from bicycle inner tube
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  4. mick noe

    mick noe Funster

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    Mr techno more pics and instuctions please:BigGrin: impressed with you improvisations so far:thumb:
     
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  5. Techno

    Techno Funster Life Member

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    Just watch the appropriate video at Floe :Laughing:
     
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  6. Techno

    Techno Funster Life Member

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    I've been reliably informed that the schrader valve will be happy to be in water permanently and thus the black isolation valve is not needed at all!
    Conclusion........... cheaper yet!! :Rofl1:
     
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  7. Reallyretired

    Reallyretired Funster

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    I just blow down the shower hose after gravity has done its work, seems to do the trick.:Smile:
     
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  8. Techno

    Techno Funster Life Member

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    For you yes
     
  9. TheBig1

    TheBig1 Funster Life Member

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    its a very simple principle. you cut into the cold water supply pipe from the tank. then plumb in a valve followed by a Tee piece. on the branch of the Tee fit a schraeder tyre type valve.

    to use, drain down as usual, then turn off valve and put an airline or footpump onto the new tyre valve and blow any residual water out of an open tap ....make sure a tap is open before blowing air with anything like an airline to avoid damage. when no more water comes out the taps take of airline and open the new isolator for the tank

    if you dont want to or cant fit an isolator valve, a non return valve will work just as well and does not require you to turn on or off. personally i would fit 2 non returns, one from the tank and one on the branch of the Tee to prevent pressure building up on the tyre valve or the rubber perishing due to being constantly in water
     
  10. JockandRita

    JockandRita Funster Life Member

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    And for us us too Andy. :thumb:

    In 25 years of caravan and MH ownership, the only problem we've had as a result of frost damage, is to the flush solenoid built in to the Thetford bowl, in what was considered to be the hardest winter since 1963. :Eek!: It was a bu##er to replace too. :Sad:

    Cheers,

    Jock.
     
  11. Techno

    Techno Funster Life Member

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    Well I gave it a wizz today and I'm impressed, Despite my usual drain down it found at least a pint in the pipes :Laughing:

    It's great for checking for leaks before filling with water too :thumb:

    Having proven it I now just leave the compressor running as long as there is one tap open all the time i.e open the second tap before closing the first. Most water came out of the pipe to the garage shower.
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  12. Techno

    Techno Funster Life Member

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    Last edited: Feb 4, 2014
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  13. Techno

    Techno Funster Life Member

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    All clipped and permanent now
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  14. jezport

    jezport Funster

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    Looking at this, does it leave the pump and its strainer at the isolated side of this system?
    Will water not be left in the pump and strainer?
     
  15. Techno

    Techno Funster Life Member

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    No
    It comes from the tank to the red tap shut off valve then to the Schraeder then the filter pump and pipework
     
  16. jezport

    jezport Funster

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    Is the pump OK with air being pushed through it.
    Would it not do the same job but with less bits if you just put an air line onto the end of the water pick up in the tank through the inspection cover?
     
  17. Techno

    Techno Funster Life Member

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    The pump is 20 psi rated wet or dry.
    Question 2 why don't you try :Rofl1:
     
  18. jezport

    jezport Funster

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    I've not had a problem with draining down, but if Im bored I may give it a go.
    Is the pump OK with the pressure coming from the wrong side though?
     
  19. Techno

    Techno Funster Life Member

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    If you re read what I said it isn't coming from the wrong side :Doh:
     
  20. jezport

    jezport Funster

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    Yes. But you are forcing 15psi through the pump from the tank side which is iusually at no pressure. That's what I mean when I say the wrong side.
     
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