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gauge glass valve design

How do PTFE inserts work

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GoCreate	18/04/2015 10:05:48
387 forum posts 119 photos	Many model designs show a tapered plug type valve design for gauge glass valves etc. However, many suppliers specify gauge glass valves having PTFE inserts, I was wondering if anyone could elaborate on the design of such valves with a view to making my own. Thanks Nigel
JasonB	18/04/2015 10:15:14
25215 forum posts 3105 photos 1 articles	Have a look at Julia's GMT build on TT, it shows how she made cocks with ptfe inserts. Photos are in her ablum dated May 2012 so should think thats about when she wrote about them. here J Edited By JasonB on 18/04/2015 10:22:22
GoCreate	19/04/2015 10:29:06
387 forum posts 119 photos	Thanks Jason, that's great, by the looks of it not a great deal to it, I guess allot depends upon getting the right fit for the insert and spindle. I steam tested my 3" Allchin for the first time last Friday and found the valves leaking a little. I had suspected this might happen and, although they don't leak much, I doubt they will pass a hydraulic test for boiler certification. I intend giving PTFE inserts a try. Cheers Nigel
JasonB	19/04/2015 11:04:30
25215 forum posts 3105 photos 1 articles	You might want to try lapping in the cones with fine lapping powder or Timesaver, had to do that with teh drain cocks that I made for my Fowler.

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