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  1. #1

    4ííSlide Valve

    The 4Ē slide valve from bottom drain to nexus is completely stuck. Since installing the Draco, itís not been regularly used, and now it is stuck solid in the open position. I assume the grooves are filled up with crud or limescale, and thereís no way know of to clear them out. Am I right in thinking that when you undo the bolts holding the valve together, the complete central section comes out, and once out, is it possible to clear the channels. Failing that, can I replace the central piece with one from a new valve? As a new valve is £50 and Iíll have to drain half the pond to do this, I have to get it right first time.
    Thanks
    Mark


    19,000 litres
    Nexus 320 with Dracodrum and submersible UV
    Blue Eco 320
    Eazy Pod on skimmer
    Dura+ 10kW Heat Pump
    16 koi

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  3. #2
    You can buy new seals etc, it’s a right pain though

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  5. #3
    Senior Member Rank = Hassai Sim's Avatar
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    Hi
    i have had the same issue, I have taken one apart before but have since just replaced if I have had an issue, I tend to fit them with rubber boots now to make this easier.
    i do this in two way
    1- gue pipe into the valve and use inline rubber boots.
    2- use clay to 110 rubber boots directly onto the valve.
    if you have ball valve these can also seize if not used so try to open and close them occasionally, the joys of hard water!

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  7. #4
    Member Rank = Nisai Jampot's Avatar
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    I just changed mine and didn't think it too difficult - the pond was however already empty. It was solvent welded originally and the orientation was quite wrong for the change from nexus to drum. I dismantled the valve from the back plate and the back plate from the new valve before reassembling appropriately.

    So yes, you can replace the centre with a new one, or I'll send you mine and all you will need is new seals:-)

    Jim
    I don't keep fish, I keep water. I don't keep fish, I keep water. I don't keep fish I kee........

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  9. #5
    Senior Member Rank = Nanasai davethefish1's Avatar
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    slide valves are not intended as isolation valves they are for 'normally closed circuits' like sluices and drain off's.
    if you use them as isolation valves they will at worse not close at all and at best pass water.
    it helps to also lubricate the stem's of slide valves, with a clear silicone grease lubricant.

    but as alreay said, fit a ball lever valve and open and close it regularly.
    Last edited by davethefish1; 30-06-2020 at 09:36 AM.
    The Solution to Pollution is Dilution

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  11. #6
    Thanks for the replies guys, but a full replacement or a ball valve is not an option. There is not enough pipe either side to cut it out and fit another, so I’ll go with a replacement centre section. I realised not long after installation that it was the wrong type of valve, it’s now added to the long list of things I wish I had done different when I built the pond.
    19,000 litres
    Nexus 320 with Dracodrum and submersible UV
    Blue Eco 320
    Eazy Pod on skimmer
    Dura+ 10kW Heat Pump
    16 koi

  12. #7
    Senior Member Rank = Nanasai davethefish1's Avatar
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    Quote Originally Posted by balder View Post
    Thanks for the replies guys, but a full replacement or a ball valve is not an option. There is not enough pipe either side to cut it out and fit another, so I’ll go with a replacement centre section. I realised not long after installation that it was the wrong type of valve, it’s now added to the long list of things I wish I had done different when I built the pond.
    if your stuck with it,
    then i'd reccomend to open and close it often, daily if possible.

    when trying to shut a gate (similar design) or slide valve never fully close it first go.
    leave the pump on to pull water through...

    1/2 close the valve then back off until open,
    3/4 close and back of until open.
    this way the crap in the groove of the 'gate' or 'slide' is scraped forward and released, then washed through by the pump.
    do this a few times before finally closing and immediately opening the valve a few times. to clear the bottom of the groove.
    The Solution to Pollution is Dilution

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