Laser-cut Pinch Valve

by nickjohnson Oct 8, 2011
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Thank you for design. It's late a bit I know, but I'm trying to build it with a 3d printer. I've ordered a few TowerPro Sg90 servos, however, the motor seems incapable of pinching the silicone hose. I'm using 6/4 mm silicone hose of medical grade. I'm trying to open/close air flow for differential pressure measurement in air. Could you give a few tips?
Yes, it seems it works fine with water. Does anyone made it work other than the designer?

Have you successfully made a 3d file for this design? I'd love to see it if so :)

Is is possible it you can make it a 3d printed file?

Is there any reason this couldn't be 3D printed rather than laser cut?

No, a 3d printed version would work fine. I only design for laser cutters because that's what I find most convenient.

Stupid question, but I'm assuming that the scale to print is 1:1 units to mm, I plan on using this for a final project so I need it to work

Hey, I've built this one but it's not quite working. I think it might be the tubing, got any advice on that? Do you have specification for the tubing you used? Thanks!

You want the very flexible, thin-walled silcone aquarium tubing - not the thick-walled, tough plastic stuff. Where did you source yours?

I got mine from a medical supplies store (Clear Plastic (PVC) Tubing 3/16" I.D. x 1/4" O.D. (wall thickness 1/32")).

Also, I didn't use the washers from step 6, do you think they may make a big difference?
Thank you very much for the quick answer!

You could conceivably control the flow rate by opening it half-way; I haven't tried. How accurate your dispensing is depends on how reliable your flow rate is and how accurately you can measure what's dispensed. The valve itself opens and closes very quickly.

Thanks. Have ordered some servos so will give it a go. Will let you know the results.

Can you change the flow rate or is it just on/off? How accurate did you estimate you could dose?

Love it!

Where did you get the pump you use in the video?

It's the mechanism out of a battery powered aquarium pump (yes, they exist). They're pretty useful, because they run off 1.5 or 3 volts, are cheap (this one cost me $10), and as you can see from the water levels, have a decent flow rate.

Very cool. The medical profession and the cocktail robotics enthusiasts will both appreciate this!

Cocktail robotics is exactly what I built it for. :)