Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

In the late 60´s/early 70´s Sears did offer the Wilesco D5 and D10 with a steamvalve, you could hunt for those, as they do come up on Ebay now and then.

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Otherwise, and if you prefer not to "operate" on an engine, i´d recommend that you bag a Jensen instead...and an electric heated one especially, as you can turn those down to VERY slow, without the safety valve lifting all the time, merely by inserting a cheap router controller inbetween the outlet and the engine.

https://www.ebay.com/itm/For-Router-Fan-Variable-Speed-Controller-Electric-Motor-Rheostat-AC-120V-US-New/353360469574

...actually, come to think of it, i´d always recommend that people bags Jensens instead, no matter which engine they´re after