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Triple expansion engine valve arrangement
sbwhart:
I've been doing a little research into a triple expansion engine I saw in one of George Watkins books.
The high pressure cylinder has a Corliss valve arrangement, and the low pressure a slide valve arrangement I reasonably understand these arrangements: but the intermediate is described as follows :-
"The intermediate cylinder is fitted with two slides and cut off plates, worked directly by eccentrics. These valves can be regulated to cut off earlier or later as required to equalize the amount of work done by the respective cylinders. In order to facilitate the adjustment of the valves the cut off spindle has a screw index and wheel"
I can understand why they would want to regulate the steam flow between the cylinders, but I can,t get my head round the how, :scratch: I've got a picture of the engine and they are two valve rods going into the intermediate valve chest.
Can any one shed a little light on this
Thanks for your help
Stew
sbwhart:
Got it sorted :smart:
from her http://www.archive.org/stream/steamengineprinc00crofrich#page/28/mode/2up
Page 28 fig 34
Stew
doubleboost:
Hi
Stew
You going to build one :drool: :drool: :drool: :drool:
John
sbwhart:
Hi John
I've got one sketched out, got most of the how too issues sorted in my head, need to translate them into a drawing that will take a little time as I want to start doing something on the loco.
Also got a 1/3 scale popcorn engine sketched out that I've started to draw up.
In the mean time I've got my mill in bits swaping the Y DRO over to right side so that it doesn't get in the way of the power feed.
I've really got an itch from the triple, got loads of info from the English Heritage archive, but I will have to sort out copyright issue with them as I think it would make a good subject for an article.
Stew
HS93:
YEA Go Go Loco :lol: :lol: no realy lets have some more of your loco please :nrocks:
Peter
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