Mystery steam engine

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If that is the case, then change this dimension.
The other dimensions above will still work.
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View attachment 163864
This is what a typical D-valve looks like.
I did a flat design for you.
You really don't need a domed design like is shown in this picture.
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View attachment 163861
Hi green twin
In my engines case
How is the d valve attached to rhe rod?
On the pic you got threads and nuts
I got a blank round.
Regards chris
 
Hi green twin
In my engines case
How is the d valve attached to rhe rod?
On the pic you got threads and nuts
I got a blank round.
Regards chris
 

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Hi green twin and jason
Can it be that here a little pressure gauge
Or a cock is installed?
Or possibly an oiler? - Or more likely an independent steam feed - which can be used for starting if the HP cylinder is at TDC/BDC? - using a steam valve akin to a Whistle valve (Normally closed, open only when operated momentarily)?
 
Yes I was thinking a Simpling valve, it's on the right side to tee off the incoming main steam feed.

Too high to be used to drain the valve chest

I'll have alook at those holes in the side of the piston valve chest.

I think I said earlier that it looked like the engine may not have been finished and that is wht the rods are not threded though some people do use grub screws to set the valve nut positions. The other thing that needs to be taken into account is that you can't get to the bottom of the valve so won't have access to any nuts to adjust the valve position, it will all need to be done from the top. That is why I have not spent time detailing the outer face of the valve.

Charles or K2 what do you think of the suggested slide valve designs, The main difference is Greentwin's has a smaller cavity so will open to exhaust a lot later than mine
 

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