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In lugnet.trains, John Neal wrote:
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In lugnet.trains, Jordan Bradford wrote:
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In lugnet.trains, Ross Crawford wrote:
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That’s pretty neat! It will be interesting to see if there’s any
deterioration of the pneumatic pumps over time, especially the seals.
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Is his system actually pumping water through the pistons, or is he using air
pressure from them to push water through tubes?
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It actually pumps the water. A large part of the design problem was getting
the system to pump an amount of water that wasn’t too much and wasn’t too
little. I’d have to say that the final result was a triumph of trial and
error:-)
JOHN
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I’m glad it uses only the pump cylinders, which means that if the water causes
the seals to fail over time it doesn’t impact any other components.
I tried to make a fire engine once, using the old pneumatic system with a
non-return valve and an old type pump cylinder. The valve input hose was in
water and the valve output hose squirted it out, with the pump cylinder on the
middle. Unfortunately it soon caused the valve to fail as the hydraulic
pressure was too much for the rubber parts inside.
It’s good that your fountain is three separate systems, with each pump cylinder
feeding two nozzles, so that if one cylinder failed during an exhibition you
still have enough to show the effect.
If, like me, you’ve bought lots of Backhoe Loaders on a 3 for 2 offer, it’s a
great way to use the surplus pump cylinders!
Mark
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