Piston Valve Bobbins

Piston Valve Bobbins

This topic has 4 replies, 2 voices, and was last updated 29 April 2023 at 13:51 by Pete Wright.

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28 February 2021 at 11:30 #530698
Pete Wright
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@petewright22338
I'm building a 3.5 inch County Carlow and currently working on the cylinder blocks and from the drawings it looks as if the valve bobbins should float on the valve rods rather than being tightened up on the spindle. This is my first build with piston valves so would appreciate some advice please.

Thanks Pete
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28 February 2021 at 11:30 #28014
Pete Wright
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@petewright22338
28 February 2021 at 14:33 #530737
Ian Wallis 1
Participant
@ianwallis1
Following advice from others I've made my bobbins float on the rod so that they self-centre in the bore, however they shouldn't have any fore/aft movement as that would affect the valve timing.
2 March 2021 at 09:21 #531152
Pete Wright
Participant
@petewright22338
That makes sense, thanks for your help.

Pete
29 April 2023 at 13:51 #643084
Pete Wright
Participant
@petewright22338
I'm currently working on the cross head water pump for my 3.5" County Carlow and thinking about increasing the diameter of the pump ram from 5/32 to 3/16 thinking I can bypass any excess delivery. I would appreciate any thoughts on this. Many thanks Pete
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