Rad valve gland packing?

Given they don't isolate well (remember we are not talking about industrial valves here, but these things):

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would not use one where I wanted reliable isolation.

If you leave it open (full or partially) for any period of time, it will leak once closed IME.

Reply to
John Rumm
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Well since most of us here do know how to do these things, I am not sure of the relevance.

You recall your claim that valve gland packings are not wound in a spiral form, and are instead formed from segments etc?

Now have a look at the photo that started the thread:

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that valve packing look segmented to you?

Personally I would say it looks like it was wound onto the spindle in a spiral fashion by the original manufacturer of the valve.

The same packing method has also been used on *every* domestic class of valve with traditional gland packing that I have ever had the need to inspect the packing material on.

Now, my interpretation of this is that it casts doubt on your claim that this is never done, or that it is the wrong way to do it. I fully accept that the way you describe is a perfectly acceptable way, and may indeed be preferred for some classes of valve, and for some applications. I don't however accept that it is wrong to repack a gland on a domestic radiator valve in the same way as it was originally made, or to use modern materials like PTFE to do so.

Indeed.

The also tend to isolate effectively, and perform much better with hard water. The full bore leaver (and butterfly) valves are IME the best isolating valves for domestic use. They are not particularly cheap though.

(They are also approved for gas work as well generally, unlike gate valves).

Reply to
John Rumm

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That is it's only use in pipe fitting. Show me a link advocating it's use in anything else in pipe fitting.

Reply to
harry

See the caulked joints section here:

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also used in traditional boat building for plank caulking.

Supplied for gland use:

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how about we finish off with a reference from BS 4271:991 "Fibrous gland packings":

Table 1 - types of fibrous gland packing : "Type B, Lubricated, plaited or braided bast fibre packing.", Further description and application: "Bast, fibre packing with a percentage of tallow. Temperature limit 85 deg C. Typical duties: Reciprocating pumps, hydraulic equipment."

ok we are done with this, you carry on by yourself.

Reply to
John Rumm

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