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Gate Valve on domestic central heating tank

Discussion in 'Plumbing and Central Heating' started by bluefunnelline, 9 May 2021.

  1. bluefunnelline

    bluefunnelline

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    Good afternoon.

    The gate valve on my oil tand is rather old. It accepts a 3?8 inch copper pipe. Will I have any problems connecting a 100mm copper pipe to the valve? If the pipe will not fit, how can I get around the problem?

    Any help would be gratefully received!

    Jimmy
     
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  3. DP

    DP

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    You certainly will have a problem connecting 100mm pipe to essentially what is 10mm valve
     
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  4. ianmcd

    ianmcd

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    would love to watch you trying to do that :rolleyes:
     
  5. BoilerBob

    BoilerBob

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    I think it’s meant to be 10mm. Bob
     
  6. ianmcd

    ianmcd

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    you should be a detective :rolleyes: you are wasted on here Shirlock
     
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  7. BoilerBob

    BoilerBob

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    Thanks Ian if I was younger I’d try. Bob
     
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  8. bluefunnelline

    bluefunnelline

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    OK lads, I plead guilty - the 100mm entry should ofr course be 10mm .

    I'm having trouble sourcing 3/8 inch pipe - will a 10mm pipe fit into a 3/8 inch gate valve? If not will I need some converter to mate a 10mm pipt to a short piece of 3/8 inch pipe?

    Sorry for the confusion1

    Jinny
     
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  9. ianmcd

    ianmcd

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    post a pic of your existing valve there are different couplers depending on the valve being used
     
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  11. fixitflav

    fixitflav

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    I assume your 3/8" valve is nominal 3/8" so will take nominal 3/8" copper pipe. Of course pipes are metric these days, I tried to find the actual OD of a 3/8" pipe on the web but no joy. I would guess it's something like 12mm, so you could get hold of some 12mm pipe (which is a standard (OD) size) and try it.
    For comparison, I have data for bigger sizes - 1/2" has OD 15.14mm, 3/4" has OD 21.49mm.
    If anybody has a chart of small nominal imperial sizes vs actual OD I'd like to see it.
     
    Last edited: 10 May 2021
  12. bluefunnelline

    bluefunnelline

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    My gate valve

    upload_2021-5-10_15-33-42.png
     
  13. polesapart

    polesapart

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    Looks like a 22mm to me.
     
  14. JimCrow

    JimCrow

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  15. ianmcd

    ianmcd

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    That is a pic of a standard gate valve, show us your actual set up, there is nothing 3/8 on that valve
     
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  16. fixitflav

    fixitflav

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    That olive would suit a pipe with actual OD 3/8", and would (obvs) need the appropriate valve. But if it's 3/8" as valve per #7 I'd have thought it would be 3/8" nominal size. If it's in Italy as the OP's flag it's likely to be an old one. I thought 3/8" actual OD pipe was only in USA.

    OP - can you tell us the pipe OD?
     
  17. JimCrow

    JimCrow

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    He has an old 3/8"OD 'compression' gate valve, quite common on old oil lines,
    the 3/8" pipe with that olive will work in the 10mm union
    ( the flag is irish ).
     
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