"engineman" wrote in message
...
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

The pressure of saturated steam is directly related to steam temperature.
120 psi is 350 deg. F.
http://www.indpipe.com/images/PDF/st...sure_table.pdf

I would think you could adapt a gas oven thermostat to regulate the steam at
350 deg.