Hi,
I want to build a graduation project using pneumatic parts.
How to find one ? I searched on Aliexpress, but I have no much idea of which one I can use.
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Neither do we.
You put together the requirements and take it from there. Some parameters of interest:
- Max pressure
- Airflow volume
- Intermittent or continuous use
- Oilfree or not
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Are you sure the Arduino forum is the right place for your question?
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With the information you have given, zero, nobody else will either but, unless clearly advised otherwise, get one with a reservoir. I recently bought one with no tank. It was a silly idea.
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I'd say it can be discussed yes. Some categories in this forum allows for broader discussions.
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Yes, I want to use it in arduino project.
So I'm not searching for heavy duty one.
I want one to be use in a graduation project, using relays, arduino, valve, pipes and actuator. Like this one:
But the problem in this project, the compressor isn't explained.
Thanks man, that's why I love this forum. Even it's specialized in Arduino but people can tell about other stuff.
The first thing to do is to discuss your idea with your tutors - to make sure that it is a suitable one!
They should also be able to help you with sourcing parts...
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That is because the compressor isn't part of the project, it is a power source, like the DC power supply connected to the UNO. Once you have selected your pneumatic cylinder you can then determine what capacity of compressor you need to operate it. A "pancake" or "hotdog" style compressor should be suitable, just make sure you turn the output regulator down to below the maximum pressure needed for the cylinder. These type compressors can be found at home improvement stores or online. Prices range from $75 to $200 US dollars.
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Good point.
@wolfrose it is common that places using compressed air will have an air supply that you can just plug into - much like you plug into the mains electrical supply.
Again, if you discuss this with your tutors they will be able to advise if the the school has such facilities.
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Actually I'm the tutor 
I'm the projects course trainer. I'm supervising now 4 projects.
All are ok and the students bought the parts, except this project which is using pneumatic parts, as I haven't worked with pneumatic technology before.
I actually found this one, it could be a good one:
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That is a blower, not an air compressor. Specifications show a maximum static pressure of 8.5kPa (1.23 psi).
We need to know the pressure / volume requirements of the actuator and related equipment.
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This is the solenoid valve I think is a suitable one, has a 24V solenoid switch that I can run with arduino + relay module.
I think 6mm should be enough. I just need to get a compressor and 6mm pipes.
Data sheet for that solenoid valve
https://www.valin.com/sites/default/files/asset/document/airtac-4v-series-solenoid-valve-datasheet.pdf
Operating pressure range is 21psi to 114psi.
Start with determining the type of actuator you need, then fit the other components to that.
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Are you sure? The text says 220V/6VA which implies otherwise. That might not mean what I think it does, but be careful. AliExpress specs can be hit or miss.
In any case, you should get a compressor that has an air dryer or can be drained: frequent air compression/expansion like you get with pneumatics causes moisture to condense out of the air. This airbrush compressor might be a good choice.
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The specs show the solenoid valve is available in 12V / 24V DC and 24V / 110V / 220 V AC versions. The OP's picture does show the 220V AC version.
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I didn't post the link, actually the product page has different options, there is AC 220V and DC 24V versions.
Yep, this link on Amazon, I would prefer to buy it from Aliexpress.
Also it might a bit for heavy duty. I just found small ones on Aliexpress. Like this one:
But it says "PENGPU 2.2LPM Micro Vacuum Pump -74KPa High Negative Pressure Small Air Diaphragm Pump 140KPa Max Positive Pressure"
Does Negative Pressure means it's for taking air and not pumping it ?
..... did you say you're the tutor? 
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140KPa = 20.3053psi, just below the minimum for your solenoid valve, and may be inadequate for your actuator.
As I said before, you need to start with the actuator. You need to know how much pressure and volume of air you need to drive the actuator with the expected load.
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