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Yes, the line closer to the camera is the input. RPM was approx. 300 when the bubbles were visible.

I definatly have valve issues,...at least at low rpm. Watch the air bubbles in the output line,...they're pulsing through the line and appear to stop or even reverse direction very briefly. I'm not sure if this indicates valve(s) not opening, or not fully closing. Your logic concerning...

Because the electric motor was becoming scorching HOT, I didn't take the time to measure flow rate, but it was very small as the motor had slowed considerably. Using this feed pump, with it's current anemic motor, to move water through the boiler would be far too risky; if the motor were to...

I replaced the 0 to 160 psi pressure guage with a liquid-filled 0 to 870 psi guage. Readings from 0 through 100 psi were remarkably smooth, but by the time I reached 200 psi the needle was bouncing around a bit, swinging +/- about 30 psi. At that pressure, 200 psi, the electric motor was...

My thoughts as well; the steel balls being slammed into the much softer 6061 drilled aluminum seat should eventually form a nicely rounded concave seat in the aluminum, which should seal much better. I should be able to hasten that process by disassembling the valve plate and gently hand...

My dummy load is the small valve, mostly hidden by my hand, in the video in post #69. In the video, I'm slowly closing that valve.

Testing Update: Measured rpm with open flow is nearly 2000 rpm, which is nearly twice what I expected, and what I designed for. At a measured 1000 rpm the open flow is only 1.7 LPM; it should be 3 LPM. Seems something wonky is still going on with my valves,...one or more valves are either not...

I have some initial test results from the final assembly, with pics and video of course :) Below is what I hope will be the final assembly; still lots of testing needed, and maybe a few problems to resolve, before I give it my seal of approval. The good news is that it siphons much better...

I didn't make room for a pully to drive a separate pump, but I made an all aluminum centrifugal pump that can be driven by a separate electric motor which will work if I need it. Until I start using hot water through the feedpump, I have an RO pump with rated flow of 5.3 L/m at 150...

Yes, quite helpful, thank you. This newer, ball-valve version doesn't siphon near as well as the previous rotating plate valve version. If I prime the pump by forcing enough water through the intake line to fill the pump with water, it siphons OK. But if I leave the pump and intake line...

Success ! :) After fixing a couple mistakes, my Mini Axial Feed Pump - V2 is now pumping water. In the video, the small, clear plastic container, the one that falls at the end of the video, holds 550 ml and is drained rather quickly by the pump. As with the previous test on the first pump...

I purchased the countersink bit some 20 years ago, likely from MSC (Machine Supply Company), but honestly, I don't remember with certainty. However, if you Google, "multi flute countersink bit" or "multi tooth countersink bit" you will find several sources. I've found the key to chatter-less...

I completed the last piece, which I've named the Channel Plate, as it contains the two ring-shaped channels; the outer ring channel connects the water input side of all 9 pistons, while the inner ring channel connects all 9 piston outputs. The channels are isolated from each other, and the...

Welcome to HMEM and to the LOS. You should be able to find whatever size lathe you want here in Thailand; there are several good machine tool suppliers in Bangkok and the surrounding areas. Do check out Alan Brown's http://modelengineeringinthailand.com as his Resource Section gives at least...

Completed another part today. This 6082 aluminum ring serves to seal the piston-side of the water intake valve and holds the springs that push against the 6mm steel balls inside the valves. I've installed two O-rings and two springs to show how they fit onto the ring; I placed a single 6mm...

I opened my axial pump CAD drawing on my computer this morning and while I was studying the next part to make, I suddenly realized that I wasn't quite finished with the valve plate; I hadn't yet drilled the cross-over holes which allow each piston to draw in fresh water. The red arrow in the...

I finished machining the vale plate today; this part holds all 18 valve balls and their springs. I machined one surface on my lathe and then parted it off. After drilling a mounting hole in the center of the disk, I bolted the plate onto my milling machine, and began drilling lots of 4mm...

Amazing !! Sludge-Kat can pump 2.5" diameter nuts, bolts, and rocks!! That thud sound you heard was me falling out of my chair !!

Ruben's post #10 translates to "sand, water, and clay sludge". When I think of sand, I imagine pumping water with beach sand in it. How can valves properly close in those conditions? Is it a matter of how fine the sand grains are?

I don't believe you can use a piston pump to move a water + sand + clay mixture. The only pump likely to survive is a Tesla pump.