At first the lubricator had excessive delivery, but I found a solution that seems to have solved the problem. I fitted the lubrication system with a needle valve for adjusting the water flow and to prevent the oil pressure from rising to excessive levels when the valve is closed or adjusted to a minimum flow, I fitted a pressure limiting valve which enters a bypass when it exceeds the set pressure.

To further improve lubrication, oil is injected into the steam in the bottleneck of a Venturi tube in the collector connected to the dome of the boiler; the output of the Venturi tube feeds all the motors and mechanisms operated by steam.

I also added a pressure gauge in order to check the correct operation of the lubricator.

Here is the design of the sectioned pressure limiter and a photo of the same installed on the lubricator:

The two photos show the collector and the regulator broken down into various parts and assembled on the dome together with the steam shut-off valve.

Here the sectioned drawing and photos with the ejector nozzle disconnected and steam testing. The water jet output clearly shows the positive outcome; water

is raised to 450 mm. The ejector is placed above the tank.

Next time: making the cab.

Part one   part two   part three   part four   part five  part six  part seven  Part eight

part nine   part ten   part eleven  part twelve  Conclusion

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Editor - David Carpenter