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Lock shield leaking when turned off

Discussion in 'Plumbing and Central Heating' started by Jonny brown, 14 Feb 2021.

  1. Jonny brown

    Jonny brown

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    Just been balancing my radiators or at least trying to . I noticed one of my lock shield valves leaks when it's turned off but doesn't when it's fully open ! . Wouldn't you think It would also leak when it's open ?
     
  2. ianmcd

    ianmcd

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    just have it half way and tighten the gland nut
     
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  4. Daviesmith

    Daviesmith

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    I've had the same problem before , not sure why it only leaks when turned off . It's a mystery
     
  5. Jackrae

    Jackrae

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    The spindle gland always has the static boiler pressure on it if the feed valve is open or there's pressure retained in the radiator and if there's any wear or dirt (paint etc) on the spindle then it could well leak when you close it as the spindle moves to a new position on the gland packing. The only time the gland has no pressure on it is when the valve is fully opened and it is of a back-seated style Screenshot 2021-02-14 at 15.54.47.png
     
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  7. Daviesmith

    Daviesmith

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    Thanks that explains why if they are going to leak it's most likely when they are closed or partially closed .
     
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