ORIGINAL: renny
I figured that out already thanks but my problem is trying to find one.
what are they called?
steam control valves
purge valves
throttle valves
and who sells them?
????????????????
All right, I've found you one which is exactly meant as a speed throttle for R/C:
http://www.bengs-modellbau.de/assets...-modellbau.de/
Sorry, website is in German. I don't know American websites to sell such stuff.
If you need help, let me know.