Hello Nobby, Another interesting video, thank you. I was not aware that they were called a spool valve, I have always liked there simplicity. Take care. Paul,,
Thanks Paul I hoped this would make an interesting video. Took me a while to understand how they would, they are a very simple solution. Keep well regards Nobby
Good explanation Nobby. You can actually join (bridge) the feed and exhaust lines of the rotary valve engine right at the crank housing, rather than at the cylinder head. The one line to the cylinder head then acts as an oscillating air chamber. Reduces the number of copper pipes required. I did this on a couple of my builds. Interesting engineering principles. Cheers Rob
Thanks so much for the comment Rob. I value you advice. I was going to follow your design, but in the end copied the Retro Steam Tech version. It did give me some practice in copper pipe bending (haha) cheers Nobby
Great explanations. has anyone done a spool valve that's actuated pneumatically/hydraulically? I understand there are spool valves arrangements which can function akin to electronic flip flops, ie they have two "input" ports, which select the output state of the spool via a pressure pulse.. and the spool will remain in it's last state until the complementary input received .I'm thinking such a spool could be extended with extra grooves to control flow into main chamber. little bump valves at appropriate angles around flywheel, could then be bumped by a projection off flywheel at appropriate crank angles etc
these v/vs are very dificult to understand the first use or invention to my knolage was mr murboch(1780ish) for his 3 wheeled traction engine itis very clever and complicated eney ttfn& ty
Thanks Nobby. I had no idea that there were different types of spool valves. Regards from Australia
Hello Nobby,
Another interesting video, thank you. I was not aware that they were called a spool valve, I have always liked there simplicity.
Take care.
Paul,,
Thanks Paul I hoped this would make an interesting video. Took me a while to understand how they would, they are a very simple solution. Keep well regards Nobby
Good explanation Nobby. You can actually join (bridge) the feed and exhaust lines of the rotary valve engine right at the crank housing, rather than at the cylinder head. The one line to the cylinder head then acts as an oscillating air chamber. Reduces the number of copper pipes required. I did this on a couple of my builds. Interesting engineering principles. Cheers Rob
Thanks so much for the comment Rob. I value you advice. I was going to follow your design, but in the end copied the Retro Steam Tech version. It did give me some practice in copper pipe bending (haha) cheers Nobby
Great explanations.
has anyone done a spool valve that's actuated pneumatically/hydraulically?
I understand there are spool valves arrangements which can function akin to electronic flip flops, ie they have two "input" ports, which select the output state of the spool via a pressure pulse.. and the spool will remain in it's last state until the complementary input received .I'm thinking such a spool could be extended with extra grooves to control flow into main chamber.
little bump valves at appropriate angles around flywheel, could then be bumped by a projection off flywheel at appropriate crank angles etc
That's an interesting idea Steve. I've not seen or heard of anything like this, but it's certainly food for thought. Cheers Nobby.
Hi I can't find part 2. please leave a link
czcams.com/video/lPCw4WseS1A/video.htmlsi=jmQyw6B3gk4PLOza
Thanks for looking here is the link. Cheers Nobby
these v/vs are very dificult to understand the first use or invention to my knolage was mr murboch(1780ish) for his 3 wheeled traction engine itis very clever and complicated eney ttfn& ty
I agree Phil. It took me some time to get my head round how the valves work. Especially the valve on the beam engine. Thanks for looking. Cheers Nobby