tag:blogger.com,1999:blog-2217393939875576576.post799418813821826212..comments2023-09-12T11:52:39.482-04:00Comments on Pandemic Ventilator Project: Preliminary Layout for Open Source Pandemic Ventilator Design PDV1 070319Dreamerhttp://www.blogger.com/profile/13701195188549081875noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-2217393939875576576.post-85561081413165425722020-04-16T09:59:51.662-04:002020-04-16T09:59:51.662-04:00Solenoid operated valves come in two fundamental d...Solenoid operated valves come in two fundamental designs. Pilot operated and direct acting. A pilot operated design essentially uses a smaller solenoid to switch part of the fluid flow and use that pressure differential to open or close the main valve. Pilot operated solenoids only function with water or other fluids and not with air or gases. A direct acting solenoid valve drives the valve plunger with the electric solenoid directly and so requires a larger, more powerful solenoid. A direct acting solenoid valve is good for air and water and may also be used other fluids and gases depending on the material comprising the seals in the valve. The Beduan one you quote from Amazon says it is OK for air and water so it should work. In my prototypes I found a 1/2" worked well for V1 but I used 3/4" valves for V2 and V3 to reduce flow restriction. It may be possible to use a 1/2" valve for V3 as some amount of back pressure (PEEP) is actually desirable, but I have not verified this.Dreamerhttps://www.blogger.com/profile/13701195188549081875noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-26953507780324209102020-04-16T09:02:39.196-04:002020-04-16T09:02:39.196-04:00I tried the Home depot irrigation valves but they ...I tried the Home depot irrigation valves but they need water pressure to operate. Also 24VAC. Am I missing something? I am using 1/2" a Beduan 12VDC brass valve at $26. Anonymoushttps://www.blogger.com/profile/14013406945503272345noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-72894265493098601442009-12-05T01:25:47.049-05:002009-12-05T01:25:47.049-05:00Whether this pandemic ventilator design is already...Whether this pandemic ventilator design is already tested? How much it may cost to design such a system? can u give me more details?Anonymoushttps://www.blogger.com/profile/17372308388209886379noreply@blogger.comtag:blogger.com,1999:blog-2217393939875576576.post-69020632638350385892008-05-30T00:10:00.000-04:002008-05-30T00:10:00.000-04:00For the bellows bag, an easy one can be found: an ...For the bellows bag, an easy one can be found: an old fashioned hot water bottle. These are nice and thick so it can tolerate plenty of wear before it needs to be replaced. The possible drawback is that you do not want a latex one. (latex allergy problem)<BR/><BR/>Solenoid valves can be found at a Home Depot in the gardening section with automated lawn watering systems. (DIY installed)<BR/><BR/>For the manometer, you can use coloured water, an LED and a photocell at the top. <BR/><BR/>Limit switches for the bellows can be easy to find at a Radio Shack or fabricated yourself. Easier to find than the magnetic switches.Anonymousnoreply@blogger.com