[modeleng] Re: Injectors
- From: "JESSE LIVINGSTON" <fernj1@xxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Sat, 19 Mar 2005 18:44:14 -0600
I have found that a lot of the problems with injectors can be traced to
boiler checks that are not large enough or else the ball does not lift off
of its seat high enough to give un-restricted flow. Of course everyone
already knows to use gently radiused curves in the delivery pipe, errrrr- -
ahhh don't they??? I noticed a photo of a Vulcan Iron Works duplex that the
delivery pipe passed completely over the boiler check and then made a
gradual loop around the check to get to the bottom. This in essence was a
270° turn! I don't know why they did not come in under the valve so only
one 90° radiused turn would have served. It might have had something to do
with the large steam pipe from the dome down the side of the boiler to a "Y"
that went to the front and rear engines.
Another problem is sometimes not having the throttling valve between the
injector and water supply adjusted correctly. Too little opening and the
injector will starve and too much will result in waste through the overflow.
Sometimes too, steam will leak back through the injector and get it too hot
to start unless cooled by pouring water on it. Full size injectors could
give problems so we must sort of expect them with our small stuff. A
properly operating injector is a joy to listen to as it sings merrily along
filling the boiler in what appears to be complete defiance of all known laws
of physics. (I have heard that they actually have little men or gremlins
inside them that pump like fury when called upon or else it is truly magic!)
I did a boiler hydro test (200psig), set the two safeties, adjusted my
automatic gas/steam regulator and fired up the boiler to make sure all was
ready for the Mid-South meet in a few weeks.
Jesse in Tennesse
> Not so sure I agree with you there. On one of my engines I could not get
the
> injector to work reliably. It wasn't until I modified the clack valve, at
> someone else's suggestion, to increase the ball lift that it worked
> correctly, regardless of what make injector I fitted. Until then I was
> sceptical of the idea as well.
>
> Andy
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