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Lockshield valve not isolating radiator

Discussion in 'Plumbing and Central Heating' started by Asdfghjkl, 17 Dec 2019.

  1. Asdfghjkl

    Asdfghjkl

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    Hi,

    I'm trying to isolate my radiator in order to change a leaking bleed valve. The lockshield valve on the radiator is just spinning and spinning and not shutting off the water. In the photo below, it's the spindle that I have been trying to turn.

    Is there anything I can do other than emptying the entire heating system to replace the lockshield valve as well?

    Thanks very much!
    Jess
     

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  3. JohnD

    JohnD

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    does your boiler have a pressure gauge?
     
  4. Asdfghjkl

    Asdfghjkl

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    Yes it does!
     
  5. JohnD

    JohnD

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    Water will squirt out when you remove that valve. It will stop squirting when the pressure reduces to zero.

    You can reduce the pressure before you start using the drain cock (or a bleed valve, which will be very slow). There is no need to drain the system. Close the drain before you start work on the valve. Turn off the valve at the other end of the radiator.

    Water will not drain out until it is open at two points. One for the water to come out, and one for air to go in to replace it.

    You will have to top up the water to repressurise the system after you have finished work.
     
  6. Asdfghjkl

    Asdfghjkl

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    Thank you. Will I need to replace that lockshield valve as well or just the bleed valve that is actually leaking?
     
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  8. JohnD

    JohnD

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    you replace the valve that is faulty

    you said the lockshield valve is faulty

    I assumed you intended to replace it.
     
  9. foxhole

    foxhole

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    Which way are you turning lock shield? Don’t think they are capable of spinning .Are you using a spanner?
     
  10. lostinthelight

    lostinthelight

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    Maybe it's got the cover cap which spins to protect flow balance ,take it off and try turning the brass spindle ?
     
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  11. foxhole

    foxhole

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    Photo shows no cover .
     
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  12. lostinthelight

    lostinthelight

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    Sorry, missed the pic on my phone
     
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