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Angle of Clack Valves

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Jon Lawes	08/03/2022 17:13:56
1078 forum posts	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.
Former Member	08/03/2022 18:50:38
1085 forum posts	[This posting has been removed]
Jon Lawes	08/03/2022 19:24:11
1078 forum posts	Thank you Bill, I am a member over there, I shall try there shortly and compare the notes from here.
duncan webster	08/03/2022 20:33:46
5307 forum posts 83 photos	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
Jon Lawes	08/03/2022 21:56:08
1078 forum posts	A good point well made

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