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Thread: What Valencia valve parts to buy?

  1. #1
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    Default What Valencia valve parts to buy?

    Fitting my house for EvoHome I have got some adapters for the old Drayton TRVs in about half the rooms - these seem to work well so far. The other radiators either have manual valves or old TRVs which no adaptors exist for (that I can see) so I plan to fit new valve bodies. It seems Valencia are the best bet but even here something simple is likely to trip me up.

    https://theevohomeshop.co.uk/14-radiator-valve-bodies

    Ignoring the top 3, are the 2nd row sets containing the bodies to go in BOTH ends of the radiator? One end has the pin for the TRV, the other is a manual on/off (the lockshield)?
    Then the bottom row are just the TRV-ready body, one comes with a regular TRV, so I save about £2 per radiator. Or for that matter, I can buy the valve with a regular tRV for only £2 more.

    If my radiators are working OK is there any particular point to replace the lockshield manual bit? Thinking I might as well get the TRV-one and I can surely sell them for more than £2 each when I fit the HR92?!

  2. #2
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    I plan to replace all my Peggler Bulldog valves for Valencia's - when I do I'll just get the TRV end and leave the existing lockshields alone - they're only a couple of years old and work fine. Unlike the TRV end which is constantly adjusting and needs to move smoothly and precisely, the lockshields only have to stay put at one setting, which even cheap ones will...

    If my lockshields were a bit older or more tatty then I might have replaced them as well.

  3. #3
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    My installer replaced all my TRV bodies with Valencia bodies when my boiler was replaced last year. I was hoping that there might be fewer clunks when the HR92s first opened. Sadly, that hasnít been the case. The original lock valves were not replaced.

  4. #4
    Automated Home Legend paulockenden's Avatar
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    If your lockshields are old I'd be tempted to replace them at the same time, while your system is fully drained down. Only adds a couple of minutes to each rad, and might safe you work in the future.

  5. #5
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    Agree with Paul change them why its drained down especially if current ones are old

  6. #6
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    You could also consider getting valves that regulate flow regardless of the water pressure (within limits of course). This makes for even more efficient heating as all rads always perform the same, regardless of the amount of TRVs closed. I've just installed 20 Heimeier Eclipse 1/2" valves without a hitch. The HR92s fit them without an adaptor.

    In The Netherlands they are just over 20 euro each. Please also see https://www.imi-hydronic.com/sites/E...s/default.aspx for better explanation.

  7. #7
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    Quote Originally Posted by TomJ View Post
    You could also consider getting valves that regulate flow regardless of the water pressure (within limits of course). This makes for even more efficient heating as all rads always perform the same, regardless of the amount of TRVs closed. I've just installed 20 Heimeier Eclipse 1/2" valves without a hitch. The HR92s fit them without an adaptor.

    In The Netherlands they are just over 20 euro each. Please also see https://www.imi-hydronic.com/sites/E...s/default.aspx for better explanation.
    thanks, I'd not seen them.

  8. #8
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    Quote Originally Posted by TomJ View Post
    You could also consider getting valves that regulate flow regardless of the water pressure (within limits of course). This makes for even more efficient heating as all rads always perform the same, regardless of the amount of TRVs closed. I've just installed 20 Heimeier Eclipse 1/2" valves without a hitch. The HR92s fit them without an adaptor.

    In The Netherlands they are just over 20 euro each. Please also see https://www.imi-hydronic.com/sites/E...s/default.aspx for better explanation.
    Looks good on paper however I'm not sure how much difference that would make in real life in an Evohome system and whether it is applicable.

    The reason being, it's not just differential pressure that will vary when the demand of other zones change, the boiler flow temperature will change dramatically as well due to the way every individual Evohome can call for heat from the boiler - and that's a much larger factor controlling how much a given zone is influenced by what other zones are doing...(like a previously stable zone at equilibrium overshooting because other zones just came on full blast)

    If anything, some variation to differential pressure of a conventional valve will "help" reduce interference between zones - when other zones close down the heat demand will drop and the flow temperature will drop but the pressure will increase through the remaining radiator possibly partially counteracting the natural tendency for its temperature to drop.

    Conversely when other zones come on and demand a lot of heat the flow temperature will increase due to the higher boiler duty cycle but the differential pressure will drop and reduce the flow through this radiator a little. Regulating the flow through each valve irrespective of differential pressure would only make that worse.

    So I don't see a point to it with an Evohome (assuming you have an ABV to iron out the biggest changes in differential pressure) and counterintuitively it may actually cause more interaction between zones instead of less.

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    Quote Originally Posted by HenGus View Post
    My installer replaced all my TRV bodies with Valencia bodies when my boiler was replaced last year. I was hoping that there might be fewer clunks when the HR92s first opened. Sadly, that hasn’t been the case. The original lock valves were not replaced.
    Clunks ? From where ?

    No clunks in my system when HR92's open or close...

  10. #10
    Automated Home Ninja Dan_Robinson's Avatar
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    Would suggest pump set too high with valve bodies on the return.
    Kind Regards - Dan Robinson (Jennings Heating Ltd)

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