A vertical steam pump.

[Michael S.]

I’ve finished the connecting rod between the eccentric and the slide valve. I was curious to see if the pump would turn when I pressed the compressed air hose against the inlet. The joint currently uses just a simple M2 screw; that will be changed later. The pump valves are also still missing.

Michae

https://youtube.com/shorts/T8Qknv03bMw?is=euOearGT2D5MOuV5l

The initial test run was performed without seals on the cylinder or stuffing box. The piston does not yet have a piston ring, and the slide valve was only roughly adjusted. Still, I am pleased that the engine turns.
Now, everything is being disassembled, and the iron parts are being painted.

[crueby]

Even without those last parts and the seals, its running very well!!

[Sanjay F]

It looks gorgeous and runs great without all the seals etc. You've really made something special there, congratulations 

[PaulR]

That's a beauty Michael and what a smooth runner already! 

[Roger B]

Looking good    I've always liked scotch yoke engines   

[Michael S.]

Thank you, Chris, Sanjay, Paul and Roger. 

[Michael S.]

Some small progress has been made on the steam pump. The parts to be painted are currently with the painter.
While the parts are drying, I’ve fabricated a simple main valve and a T-fitting with a displacement lubricator. All that’s missing now are the valves for the water pump. So, there’s still a bit of work to do.

Michael

[Sanjay F]

Its the small details which make the difference and you certainly have them 

[crueby]

I really like the shapes on the valves.   

[Michael S.]

The cylinder sheet is finished—this time made of copper.
Since copper darkens quickly, I used a copper/brass patina solution to help the process along.

Michael

[cnr6400]

 

[crueby]

The patina solution gave it a great color.

[Michael S.]

#Invalid YouTube Link#Today I made the two valves for the water pump and then lapped them with fine polishing compound.

I even had time to test with water.


https://youtube.com/shorts/dAwTKqKB29c?is=UwcseQsezHoW0Kwz

[crueby]

Do the valves have springs holding them down, or is it just their own weight?

[Michael S.]

Hi Chris, no springs.
The plans don't call for any springs. It looks like it works. I’m not sure which is better, though—ball valves or cone valves, with or without springs.
In any case, this is my first pump using these types of valves.

Michael