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Pinch Valve

by hansj66, published

Pinch Valve by hansj66 Dec 18, 2012
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Summary

The design files for this thing have been removed as a protest against Stratasys after their decision to file a patent infringement lawsuit against Microboards Technology. Their decision is extremely destructive and also underlines that the patent system is obsolete as it no longer serves any purpose for the betterment of society. Its main role is as a blunt weapon used by incumbents to hamper innovation. I see absolutely no reason to continue indirectly supporting Stratasys by providing free content to Thingiverse.


Valve for obstructing fluid flow without making contact with the fluid itself. This type of valve is typically used in bioprocessing, medical equipment and in the food industry.

Instructions

This design uses a GS-D9025 micro servo that has been modified for full rotation and DC drive.

1) Print the 5 parts.
2) Attach the part "pv_a" to the servo.
3) Mount a M8 hex head bolt in part "pv_a" and attach the retainer ring ("pv_d") using acetone glue.
4) Mount a M8 hex nut inside "pv_c" and attach the retainer ring ("pv_e") with acetone glue.
5) Mount the servo+pv_a/d/c/e assembly in part "pv_b" (ps. it's a tight squeeze :)).
6) Fasten the servo to "pv_b" with screws.
7) (Optionally) attach limit switches. The design uses standard arcade-style switches.

Hook up the servo and switches to your microcontroller and driver circuitry of choice, Insert a tube between the "pointy bits" - and pinch away !

I have uploaded a video to YouTube that demonstrates the operation of the valve (http://www.youtube.com/watch?v=mUHaso6QWVU)

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