Adjustable One Way Valve
by kwalus, published
Very simple one-way or check valve with adjustable cracking pressure. The two ports are currently 1/4 inch but I am also including the SolidWorks files in case you want to modify or remix it.
With the right spring, you can very easily blow in one end but not the other.
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You need to print this at 0.1mm especially the threaded plunger and nut. I printed this on a Rep 2 using PLA at 0.1mm and 100% fill for the plunger and nut and 5% for everythign else. The two end caps were printed with the 1/4 inch port facing down and using a raft and supports. You will also need a small spring and can adjust the nut to provide the necessary cracking pressure.