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Radiator Valve Sizes

Discuss Radiator Valve Sizes at UK Plumbers Forums; Originally Posted by AWJD I have now been to both the main plumbing merchants in Abingdon (Grahams and Plumb Centre) and nobody in either had ever seen a Lockshield valve ...
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    Default Re: Radiator Valve Sizes

    Quote Originally Posted by AWJD View Post
    I have now been to both the main plumbing merchants in Abingdon (Grahams and Plumb Centre) and nobody in either had ever seen a Lockshield valve with drain with a 1" thread to the radiator. The guy in the Plumb Centre said he'd worked there for 25 years and never seen one even though my radiator is only 15 years old.

    How come I can then walk into Screwfix of all places and buy one over the counter as recommended by you guys on the forum? It seems to be a standard size for Screwfix but to nobody else in the industry?
    Because it's not a 1" lockshield with drain off
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    Default Re: Radiator Valve Sizes

    It doesn't matter what the technical description for the valve is, I took the original one into the plumbing merchants and they said they had never seen one before with that sized thread on the radiator outlet!!

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    Default Re: Radiator Valve Sizes

    Quote Originally Posted by AWJD View Post
    It doesn't matter what the technical description for the valve is, I took the original one into the plumbing merchants and they said they had never seen one before with that sized thread on the radiator outlet!!
    You have a screwfix and a b&q in Abingdon suggest you try either of them, b&q will have them out on display.
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    Default Re: Radiator Valve Sizes

    Quote Originally Posted by ShaunCorbs View Post
    Because it's not a 1" lockshield with drain off
    I didn't say it was a '1" lockshield with drain off '. In fact it is a 10mm radiator valve with drain off which can be configured either as a lockshield or a manual valve as described on the packaging but it has a 1" thread on the radiator connection.

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    Default Re: Radiator Valve Sizes

    Quote Originally Posted by AWJD View Post
    I didn't say it was a '1" lockshield with drain off '. In fact it is a 10mm radiator valve with drain off which can be configured either as a lockshield or a manual valve as described on the packaging but it has a 1" thread on the radiator connection.
    But that's not the rad connection, it's the connection on the Union
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    Default Re: Radiator Valve Sizes

    Quote Originally Posted by ShaunCorbs View Post
    But that's not the rad connection, it's the connection on the Union
    AWJD, it is made up of 2 parts, the 1st part screws into the radiator on a tapered thread then your valve connects from this part via the large nut to your 10mm pipe.
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    Default Re: Radiator Valve Sizes

    My radiator came with the tail/unions already in place and that is what I was trying to connect a new valve to. What I was trying to understand is what are considered standard union thread sizes for these types of valve and why Screwfix do a 1" threaded connection to the union but proper plumbing merchants don't?

    Fortunately, I've now got a replacement valve from Screwfix and so the problem is solved!

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    Default Re: Radiator Valve Sizes

    Quote Originally Posted by AWJD View Post
    My radiator came with the tail/unions already in place and that is what I was trying to connect a new valve to. What I was trying to understand is what are considered standard union thread sizes for these types of valve and why Screwfix do a 1" threaded connection to the union but proper plumbing merchants don't?

    Fortunately, I've now got a replacement valve from Screwfix and so the problem is solved!
    Hurrah!
    I think the merchant was messing with you tbh.
    Last edited by rpm; 1 Week Ago at 01:50 PM.
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    Default Re: Radiator Valve Sizes

    it is called 3/4" not 1" that's why
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    Default Re: Radiator Valve Sizes

    Quote Originally Posted by steveb View Post
    it is called 3/4" not 1" that's why
    Which makes BSP so confusing to the unexperienced.
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    Default Re: Radiator Valve Sizes

    Quote Originally Posted by AWJD View Post
    My radiator came with the tail/unions already in place and that is what I was trying to connect a new valve to. What I was trying to understand is what are considered standard union thread sizes for these types of valve and why Screwfix do a 1" threaded connection to the union but proper plumbing merchants don't?

    Fortunately, I've now got a replacement valve from Screwfix and so the problem is solved!
    What was the screwfix part number in case one of us guys come up against the same problem.
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    Default Re: Radiator Valve Sizes

    I bought part 36552 from Screwfix. As said, I took the original valve into the 2 x plumbing merchants and neither had a size that matched. I'm going back to Screwfix tomorrow to get another valve for the other end of the radiator without the drain.

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