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Step 2Valves and Pipes
The Pandemic Ventilator Project
To get started you will need the valves. You may be able to find some used ones somewhere. New valves are expensive, over $100 each. The inlet valve can be 1/4 inch normally open valve, the other two should be a minimum 1/2 inch diameter, one normally open (NO) and the other normally closed (NC). They must be of a direct acting solenoid type.
Direct acting solenoid types are required to operate with air. Pilot operated types will only operate with liquids. Pressure ratings do not matter for the 1/2 inch valves, but the 1/4 inch valve should have at least a 50 psi rating. If you can only get either NO or NC 1/2 inch valves you can still make it work by adjusting the PLC program. The inlet 1/4inch valve must be a NC valve or you will end up blowing up a lot of bags in the testing phase.
The valves are connected with pipe and mounted in such a way that the T to the Bellows lines up with the center of the bellows unit.
I used threaded pipe fittings. with teflon tape on the fittings.
I also used:
Two 1/2 inch NPT Ts, One 1/4 inch airline fitting (to connect to an air supply)
Four 1/4 inch pipe nipples (short pipe sections threaded at both ends)
Three 1/4 inch to 1/2 inch adapters
Two 1/2 inch pipe nipples
One 1/2 inch plug (this plugs the line that will go to the manometer planned for later)
To get started you will need the valves. You may be able to find some used ones somewhere. New valves are expensive, over $100 each. The inlet valve can be 1/4 inch normally open valve, the other two should be a minimum 1/2 inch diameter, one normally open (NO) and the other normally closed (NC). They must be of a direct acting solenoid type.
Direct acting solenoid types are required to operate with air. Pilot operated types will only operate with liquids. Pressure ratings do not matter for the 1/2 inch valves, but the 1/4 inch valve should have at least a 50 psi rating. If you can only get either NO or NC 1/2 inch valves you can still make it work by adjusting the PLC program. The inlet 1/4inch valve must be a NC valve or you will end up blowing up a lot of bags in the testing phase.
The valves are connected with pipe and mounted in such a way that the T to the Bellows lines up with the center of the bellows unit.
I used threaded pipe fittings. with teflon tape on the fittings.
I also used:
Two 1/2 inch NPT Ts, One 1/4 inch airline fitting (to connect to an air supply)
Four 1/4 inch pipe nipples (short pipe sections threaded at both ends)
Three 1/4 inch to 1/2 inch adapters
Two 1/2 inch pipe nipples
One 1/2 inch plug (this plugs the line that will go to the manometer planned for later)
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