Yep 
I know I'm lacking knowledge in some stuff but I'm learning something new every time.
OK, I got you now I know what to search for.
Thanks man.
That's the spirit
This project, how long will it last? Is it four installments of pneumatics, if so, are they far from each other?
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It's just for diploma graduation project, just for showcase of using arduino to run a pneumatic system.
Now I need the basic parts:
- the air pump
- valve, pipes
- 24V power supply
- actuator
- relay module
- conveyor belt
- arduino
I'm now near to figure out what air pump I need, then the rest should be easy.
I think these should do it enough.
Got you my friend
I'm working on it 
I'm afraid that means little to me, but anyway: Try to borrow a compressor from a craftsman, carpenter for example. They use those for nail guns, spray painting etc. Someone could have a spare, or perhaps there's one in your school? It'll be fine for the cfm, and psi no problem.
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I have several pumps like that. Came from SMD repair stations. Vacuum to pick up the device and pressure to put it down. There was a solenoid valve to do the switching.
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This also might be a good choice:
It's 24V and > 200 KPA. But it's a bit expensive.
I'm searching for a cheaper one.
While you are searching, also search for an appropriate storage tank for the compressed air. Otherwise you are limited to the instantaneous volume of air your compressor can produce!
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I have some of those pumps. It's a popular form factor: you can find them from cheap AliExpress suppliers, as well as reputable (and expensive!!!) suppliers like Parker Hannefin, KNF Neuberger or Hargreaves.
How many do you need? I have a couple 24V pumps that I think are from either KNF or Hargreaves. They were removed working from prototype equipment. I can let you have one for the price of a USPS small flat-rate box if you're in the US.
They are two port pumps so they can be used for either positive pressure or vacuum depending on how they are plumbed.
I have one with a small reservoir attached, but I don't think it's working very well.
[edit]
If you want actuators, I also have a couple of small air cylinders (and maybe even some solenoid manifolds) I can toss in. I've been sitting on this stuff for over 10 years and odds are slim to none that I'll ever use them.
Thank you so much man for pointing important aspects.
OK, so now that's an important issue to cover, if I didn't get a tank, then I have to launch the compressor every time I have to switch on/off the pneumatic actuator with the pneumatic valve.
I thought of skipping the tank part if it would not fit the available project budget.
Thank you for the help, but I don't live in USA.
It's OK, it's not for me, it's for students project and I prefer they buy it from Aliexpress so they are on the same line as the other students.
And every time you switch, the air pressure will rapidly drop because the compressor can't keep up with the actuator.
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If you do use a small pump and an air compressor be sure to put a check valve between the two or back pressure from the tank will make the pump struggle to operate
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OK, now it's getting serious, I have to get the tank!
I'm searching now for related air tanks on Aliexpress.
Please can you provide me with an example ? a picture or a YouTube video about what you mean.
There is a control system called pneumatic Logic, It has been around for over 50 years that I know of. There are many companies in the field that do manufacture all of the parts needed and they have a range of publications that will make you very knowledgeable in the field. You may want to contact some of them probably sales or engineering department and explain your project they may be able to help you. Try searching for " pneumatic Logic", DuckDuckGo gave me a lot of great hits.
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If I wanted a pressured air supply for a limited demo, I would use an overinflated car or truck wheel and get maybe 50 psi for few minutes.
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