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Thread: Automatic Air Vent Valves

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    DIY Junior Member invisible-man's Avatar
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    Default Automatic Air Vent Valves

    Hi everyone,

    I need to replace the automatic air vent valves in my domestic hydronic heating system and was going to use the Watts FV-4M1 valves.....I noticed that there are 1/8" and 1/4" sizes, does this relate to the thread size, as I do not know which ones to order.....is there a common size in a domestic system?

    Many thanks, Martin

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    Consultant cwhyu2's Avatar
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    Yes it is the thread size.

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    DIY Junior Member invisible-man's Avatar
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    Thanks cwhyu2.......do you know if one size is more common than the other?

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    Consultant cwhyu2's Avatar
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    1/8 is the most common that I have worked with but there are other factors as in is it metric or iron pipe size,and is it base board or iron radiators.
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    Last edited by cwhyu2; 08-15-2011 at 02:06 PM.

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    DIY Junior Member invisible-man's Avatar
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    Quote Originally Posted by cwhyu2 View Post
    1/8 is the most common that I have worked with but there are other factors as in is it metric or iron pipe size,and is it base board or iron radiators.
    It is my home in Michigan US and has baseboard heating with a WEIL McLEIN Gold series 4 boiler......

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    DIY Senior Member BobL43's Avatar
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    Quote Originally Posted by invisible-man View Post
    It is my home in Michigan US and has baseboard heating with a WEIL McLEIN Gold series 4 boiler......
    Without being able to see it from here, it would be easier to say which size you have if you can measure the actual diameter of the threaded part of the air bleeder. What you actually measure is not what the iron pipe size is called, but it will give us an idea of which one it is, if it an American thread. for instance, the 1/8 pipe size actually measures out at "3/8" inch, and the 1/4 inch pipe measuures just about "1/2" inch in outside diameters. (Not measured with a caliper, but a tape measure or steel rule).
    I am definitely not a pro plumber, but I am a pro crastinator

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    DIY Junior Member invisible-man's Avatar
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    Quote Originally Posted by BobL43 View Post
    Without being able to see it from here, it would be easier to say which size you have if you can measure the actual diameter of the threaded part of the air bleeder. What you actually measure is not what the iron pipe size is called, but it will give us an idea of which one it is, if it an American thread. for instance, the 1/8 pipe size actually measures out at "3/8" inch, and the 1/4 inch pipe measuures just about "1/2" inch in outside diameters. (Not measured with a caliper, but a tape measure or steel rule).
    Thanks

    Problem is that I am in the UK so cannot measure, and wanted to order parts before arriving in the US.....perhaps I can ask a neighbor to measure the outside diameter of the existing ones!

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    Moderator & Master Plumber hj's Avatar
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    Basseboard would usually have 1/8" vents, and cast iron radiators 1/4".
    Licensed residential and commercial plumber

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    DIY Junior Member invisible-man's Avatar
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    Quote Originally Posted by hj View Post
    Basseboard would usually have 1/8" vents, and cast iron radiators 1/4".
    Thanks for that, 1/8 does seem to be the general opinion, I do seem to remember them having quite a fine thread!

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