Angle of Clack Valves

Angle of Clack Valves

This topic has 5 replies, 3 voices, and was last updated 8 March 2022 at 21:56 by Jon Lawes.

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8 March 2022 at 17:13 #588779
Jon Lawes
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@jonlawes51698
I'm looking to incorporate top feeds in a boiler but don't want the spindly top feeds you often seen on the tops of 3.5" Britannias and such; they look great but I don't think my machining is quite of the required standard. As a result I figured a standard clack into a threaded bush (as per many backhead clacks) would be my best bet, albeit up higher on the side of the boiler.

How much angle from the vertical do we think a clack will tolerate before needing the assistance of a spring to close? Is it worth making them with a small spring anyway just to improve their efficiency?

I know some of this has been covered before but not this specific question, sorry to those who may have seen it all before.
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8 March 2022 at 17:13 #2121
Jon Lawes
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@jonlawes51698
8 March 2022 at 18:50 #588793
Former Member
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@formermember12892
[This posting has been removed]
8 March 2022 at 19:24 #588799
Jon Lawes
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@jonlawes51698
Thank you Bill, I am a member over there, I shall try there shortly and compare the notes from here.
8 March 2022 at 20:33 #588811
duncan webster 1
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@duncanwebster1
You can make the one on top of the boiler a dummy (ie just an elbow) and put the real clack further down the pipe hidden under the running boards
8 March 2022 at 21:56 #588820
Jon Lawes
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@jonlawes51698
A good point well made
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