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Plumbing problem

  • 02-04-2008 9:57am
    #1
    TKK
    Closed Accounts Posts: 566 ✭✭✭


    I'm in the process of doing some work on my heating system which involves the fitting of a new motorised valve. The problem is that the motorised valve, like all those I've seen, is 22mm but the only pipe I can get is 3/4".

    One supplier has said that I can use 3/4" pipe and olives in the 22mm fittings of the valve. From a quick look yesterday I reckon it would work alright but I would welcome any comments.

    I'm unsure of the existing pipework (which has 2 existing myson mpe222 motorised valves on it already) as I don't have anyway of accurately measuring it but a quick test with a vice-grips (also functions as a calipers!) seems to suggest that the pipes are 3/4".

    Is it ok to use 3/4" pipe and olives with 22mm fittings?


Comments

  • #2
    MickLimk
    Closed Accounts Posts: 188 ✭✭MickLimk


    Yep, do it all the time. It's also standard practice with 15mm-1/2inch fittings.


  • #3
    DublinDilbert
    Registered Users, Registered Users 2 Posts: 5,401 ✭✭✭DublinDilbert


    MickLimk wrote: »
    Yep, do it all the time. It's also standard practice with 15mm-1/2inch fittings.

    Its actually very common practice now with things like boilers where the water in/out ports are metric 22mm. You just use the 3/4' olive and nut and your sorted....


  • #4
    TKK
    Closed Accounts Posts: 566 ✭✭✭TKK


    Excellent. Means I can stop my search for 22mm piping.

    Does the 3/4" nut fit the valves etc that are 22mm?


  • #5
    John mac
    Registered Users, Registered Users 2 Posts: 5,140 ✭✭✭John mac


    yes they do.


  • #6
    landydef
    Closed Accounts Posts: 296 ✭✭landydef


    it might be worth compressing the olive with the valve then taking it back off and giving the olive a few wraps of ptfe then just tighten up again plus you may have to use the nut they give you as sometimes the tread can be slightly different


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  • #7
    TKK
    Closed Accounts Posts: 566 ✭✭✭TKK


    Got the job done last night and the heating is back up and running with no leaks around the new valve. The original pipework was indeed 3/4". The accessible spot I had been trying to measure was slightly ovalled which explains why I wasn't sure which I had.

    So all I have to do now is wire it all up.


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