Triple Expansion Engine:- valve arrangement help wanted

[Stewart HartParticipant @stewarthart90345]

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, 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

[Stewart HartParticipant @stewarthart90345]

[Stewart HartParticipant @stewarthart90345]

Got it sorted from her

 

http://www.archive.org/stream/steamengineprinc00crofrich#page/28/mode/2up

 

 

Stew

 

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