Charlotte - can you ask you Dad about model steam governors where they can be found and if he knows of any kits that are available. I am building a scale man cave (1/12 scale) so when my granddaughter plays with her doll house I have some place to play with my scale machines to make my own scale parts. I have got most of the PS Model scale machine kits and am build their diorama for displaying my work. It would be nice to have control over how fast the main shaft spins so that the machines run at a realistic speed.
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The main problem is not the governor but the butterfly valve.
The stuart design is not effective. The Stuart design calls for the pivot rod to be split and the valve disc to be fitted in the cutout.
The cup is also oval to block the pipe at an angle. It should be round, the same size as the inside diameter of the pipe. the shows two standard butterfly valve forms the basic type 1 left (Stuart) and the double offset valve. The double offset is much more effective, it has the disk fitted to the upstream side of the pivot. This should be fairly easy to achieve. The second offset is having the pivot point off centre, this would be a bit more difficult to achieve due to the small valve size. using either or both of these valve mods should improve the effectiveness.
the next crucial thing is setup the governor extreme limit to match the full valve throw. The adjustment nuts allow the spring tension to be adjusted And can be used to adjust the engine speed.Of course for such a small valve, reliably regulating 60psi, is a big ask.
Some of the prints are not exactly correct with the Stuart Governer. I am finding that out right now.
Yep! Stuart models sell governor kits with world-wide shipping. Dad tends to find them fairly ineffective on small model steam engines unless they are expertly made.
Thanks for the pointer I just went there and it took some searching but found it. I ordered 1 and also at belt for it. Thanks again. This is going to be hooked up to the RS mode 3 engine when I get it built.
Have you looked at the Stuart Models site? They have a governor kit for a couple of their engines. It might be worth a look.