WW&F Railway Museum Discussion > Work and Events

WW&F No. 10 - Official Work Thread

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Gordon Cook:
Thanks. Steve, I hope a properly working injector doesn't make firing #10 any less exciting! ;)
Ira, this gun has been hammered and abused quite a bit. I'm puzzled as to why whacking it would help, the only thing I can think of is the case where the check valve is stuck (that's on the right side in the picture, at the output into the boiler) but otherwise it shouldn't have any effect. Everything else that moves is connected to the operating lever.
And, yes John, you have a sharp eye, but those aren't test tubes. They belong to my other career, designing speakers.
I was experimenting with the ideal shape for port tubes for small vented (bass reflex) speakers, and shaping plastic tubing so it has a gradually expanding cross section from the middle to the ends. Ironically, the injector work gave me some insights into this, and I used the same principle as the delivery tube in the injector uses to smooth out the air flow through the port tube. In small, high output speakers the air velocity is limited by the noise it makes as it tries to go through the tube, so any improvement there improves the speaker's bass output which comes out the port.
Now, back to smoothing up the steam valve stem.

Ed Lecuyer:
If I may inject myself into this conversation....

What exactly is an injector? Me, being a newbe to steam railroading hears terms like these all the time, but has no idea what they are or the purpose they serve.

Thanks,

-Ed

James Patten:
An injector injects water into the boiler.  Steam comes in from the top, water comes in from the bottom, a miracle occurs in the middle causing the energy from the steam to turn into velocity for the water, which causes the water to overcome the pressure behind the check valve at the boiler and open the valve to let the water in.  Pulling the handle back causes the miracle to happen.

Ira Schreiber:
Gawdon, et al,.
The ball pein hammer was exactly for the check valve as the water we used
had a high grass and straw content.
The injectors, Penberthy I believe, were controlled by globe valves and not levers. At just the right moment, a judicious tap of the hammer would get the check ball to move and allow water to enter.

Keith Taylor:
Hello Gordon,
Beautiful work! Were the original tubes wire drawn? Did you have to make special reamers for the steam nozzle, combining tube and delivery nozzle? Please post some pictures of the tooling! Just curious, are the tubes straight tapers or are they a curved cross section. The Sellers injectors I've worked on had a curved inner taper, and I'd bet making a reamer for those would be very involved.
Again....superb work of which you should be justly proud!
Keith

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