Disclaimer
3D Printing Tech is NOT the designer of this valve, we are simple able to produce it in large quantities and are offering to do so at cost (labor + materials) during this time.
Author: Filip Kober | 23.03.2020 | +48 690 496 990 | filip@kober.com.pl
Disclaimer from Author:
Valve has not been tested and certified for medical use, however it has been designed to be safe. Author takes no responibility for failure of the device. Be aware, that production with a use of 3D printer is charged with imperfections and can’t be validated. Please be aware, that oxygen is a flammable gas and may explode if leak will occur. This is subsonic device, however it may generate acoustic effect, that will damage hearing. Use ear-protection.
Introduction
Valve uses Venturi effect to generate underpressure in a tube consisting of three parts - a convergent section (nozzle), followed by constant section (throat), ending in a gradual expansion (diffuser). Due to the oxygen flow underpressure is generated in the nozzle and air is beeing sucked into valve.
Valve is powered with a stream of pure oxygen with the flow rate 10 lpm. Two streams are mixing in diffuser: oxygen (100% O2) + air (21% O2) resulting in high flow, high oxygen stream at the outlet.
Assembly
Valve needs to be assembled from two parts. Assembly process needs no additional adhesives like tape or glue. Parts are shape-connected.
Connections
Valve is meant to be connected with mask via 25mm hose. Oxygen should be delivered with 5-6 hose.