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Thank you and merci. It has been a long saga but all ok now. Passed the steam test at Cheddar Steam Club so good to go.

Hi all, I have managed to control the safety valve and have completed my project thus far. Boiler tested, steam test tomorrow. Have attached a couple of pics. Thanks for all help. Paul

Hi All, thank you Charles for your thoughts. I have built several versions using your guide lines over the last week. Still not any nearer but have learned a lot about the variables involved. I had thought that my springs would obey Hooke's law ie be linear but perhaps because we only use a very...

Hi all, have tried various strength springs and finished with one that opens at about 42psi and closes at 30psi. I take your comments and realize I was barking up the wrong tree. Thank you for your support.

Tin, thank you for advice. Will try changing spring tension. paul

At long last have made 3" vert boiler with grateful thanks to SandyC for his inspiring design. Have tested at home to 100+psi. Having trouble with safety valve. Have made open ball and enclosed. Both open at about right pressure (40psi using compressor). Neither will shut until about 20psi. What...

Tin: thanks for the welcome. Have posted my resume plus photo of slide valve engine just completed.

I am a novice at model engineering. I am interested in scratch building a steam powered model boat. To date I have made a simple wobbler plus pot boiler (to see if I could) and now have finished a twin cylinder double acting slide valve engine à la Malcolm Beak. It runs well on a few pounds of...

Thank you so much for the info. I have just got to stage where my slide valve engine runs on air and needed guidance on a regulator.