At home I have a picture and description of
a very cute gas regulator for a Linotype machine.
It held the temperature of the typemetal pot at a
constant temperature and was only 3 or 4 parts.

I'll try to scan it you if you like.

engineman wrote:
I built a propane fueled steam powered cycle.
http://www.youtube.com/watch?v=cVn00...eature=related
Now I want to add a pressure control to turn the gas flow down or off
when the pressure of120 PSI is reached.
It would be too clumsy to use a regulator from a large boiler, I need
a small device that would work with a valve using 1/8" pipe threads.
I also would like to avoid electrical devices so as to eliminate the
need for batteries.
So Does anyone know of a source of a device like this or plans to
build one?

Engineman