gauge glass valve design

gauge glass valve design

This topic has 4 replies, 2 voices, and was last updated 19 April 2015 at 11:04 by JasonB.

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18 April 2015 at 10:05 #2823
GoCreate
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@gocreate
How do PTFE inserts work
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18 April 2015 at 10:05 #186811
GoCreate
Participant
@gocreate
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
18 April 2015 at 10:15 #186814
JasonB
Moderator
@jasonb
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
19 April 2015 at 10:29 #186946
GoCreate
Participant
@gocreate
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
19 April 2015 at 11:04 #186949
JasonB
Moderator
@jasonb
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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