EPV Update 2020.04.05

Return to Emergency Pandemic Ventilator

Someone asked about how the bucket / regulator works.

A very rough schematic

A very rough schematic

Middle washer allows 2 springs to extend travel range. Catches on threads though.

Middle washer allows 2 springs to extend travel range. Catches on threads though.

Another option, not self-actuating but could provide coarser pre-adjustment before fine tuning with the sprung valve above. A section of PVC pipe with a hole cut out, and a second section of the same pipe with 1/3 of the circumference removed stretched over the top as a manually adjustable cover.

Another option, not self-actuating but could provide coarser pre-adjustment before fine tuning with the sprung valve above. A section of PVC pipe with a hole cut out, and a second section of the same pipe with 1/3 of the circumference removed stretched over the top as a manually adjustable cover.

And a video in action (previous version without handwheel - a pain to adjust)