Customizable pinch valve for flexible tubing
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Rolling pinch valve that can be clamped onto tubing in-place, to reduce or stop flow through the tube.
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Use this valve to control or shut off the flow in flexible tubing, like air tubes used with aquariums.
Included STLs are sized for some “standard” aquarium air tubing that I had laying around. Customize in OpenScad to resize as you see fit.
Customization:
- tube OD = outer diameter of the tube.
- tube ID = inner diameter of the tube. This is actually how far the wheel will crush the tube when it reaches the end; if you don't want the valve to completely pinch off your tubing enter a number smaller than the actual tube inner diameter; if you find that your tube doesn't completely pinch off when you want it to, use a larger value.
- steps = this translates to how long the ramp in the valve is. The track inside the valve has ridges to help the wheel not slip, and this is the actual number of ridges inside. A higher number will allow finer flow control, but it will result in a larger print.
- tolerance = Extra space for the wheel to fit in the groove. Must not be smaller than the layer height for the wheel.
Note: The groove is wider than the parameterized tube OD so it will still fit when the tube is compressed flat.
Use supports to print, especially for the wheel. I used standard/close supports in Orca slicer for my print. The wheel will benefit from a finer layer height (I used 0.1mm) but the groove should work fine with 0.2mm layer height.
The images show a print that failed near the end (I have been short on time to re-print) but it printed enough to show the functionality. Lay the tubing into the groove, then insert the wheel on top and roll the wheel forward to clamp pinch down on the tube.