Demo set one-way-valves

thingiverse

This is a demonstration set for one-way valves, not intended as a basis for actual breathing apparatus or diving equipment. Apart from 3D-printed parts, a flat latex sheet and an M2 screw are required. A simple variant also needs M2 thread-cutting tools, but a longer screw and nut are also options. In this case, the thread hole must be drilled up to 2mm. Two demonstration variants are provided: one for a single valve demo set that requires one assembled valve, one singleValveTube, and one valveFixingClamp3; another for a double valve demo set that requires two assembled valves, the yTube2, and two valveFixingClamp3. The two valves should be installed in different orientations. The material can be PLA, but the valveFixingClamps may deform and lose pressure if left under tension too long. A 1mm thick latex sheet is used, which should be very flat. A bicycle tire can also work, but it is thicker and not as flat as the recommended material. Attempts to print valves using flexible filament were not successful. With a threaded 3D-printed part, an M2 screw can be 10mm long. For a screw and nut solution, the screw must be 20mm long. The tubes have an endstop, combined with the fixing clamp, this should keep the valve in place (at least for low pressure differences).