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[tobyker]

somewhere along the way I picked up a little copper horizontal pot boiler, the sort that you lift up to put the fuel tablets underneath. It came with no safety valve, but the steam supply was via silicone tubing. Presumably this acts as the S/v - but what sort of pressure will this stuff stand?

[derekwarner]

tobyker ...silicone tubing may be good for 1.5 Bar........but it also depends on the level of security attachment........but having said this........it is not an alternative to a relief valve  ....Derek

[Bunkerbarge]

That's strange, I have a very small steam engine as a novelty with a bore of about a couple of millimetres.  The boiler is less than an inch diameter and a couple of inches long yet that is still fitted with a safety valve.

This one though does incorporate the safety valve in the filling cap so are you sure there is nothing hidden somewhere?  You can also argue that an oscillator with a spring holding the cylinder onto the port face is a safety valve that will lift in the case of an over prerssure but I would not be happy with such an arrangement and wouldn't use it myself.

[Circlip]

Some of the American offerings use the Silicone tube coupling as an overpressure blow off feature. Seems that it's only us Brits that get "Hookey" about safety.

   Regards  Ian.

[steamboatmodel]

The Midwest Model VI Steam Engine kit does not come with a Safety Valve, plus they tell you to soft solder it together. There Heritage kit comes pre-assembled pre-soldered with a pressure relief valve. I have one of the Model VI Steam Engine kits which I silver soldered and added a extra bushing for a safety valve. I then discovered that the fill fitting (A brass lampshade holding ferule) is threaded the same as a Mamod safety valve.
Regards,
Gerald.