How a Bike Pump Works

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1. it's good explaining the outlet valve, but how and what exactly causes the inlet valve to close?
   is it really 90 degrees down? or does it have a slight angle to shut right away when it gets pressurised?
   
   What is needed to make the pump air tight, rubber?
   
   i was hoping to know a Little bit more details
2. thanks
3. good explanation ,thanx
4. captions to copy?
5. I'm wondering what happens in right side of the upper chamber? It's not told. Is it a separate airtight chamber? If yes, there will be great pressure changes as the piston moves, right? Too big for a person to handle? If yes, the animation is wrong.
6. good way of explanation,but need extra information like complete information of parts inside body of pump
7. I've noticed whenever I pump up my road tires that as the pressure gets higher it becomes more and more difficult to pump (my pump has a built in gauge). I'd assume that different pumps vary, but is this because you have to press down with the same amount of force as the pressure in the tire in order to push more air into it?
8. I fucking love bike pumps
9. Excellent explanation and demo. Thanks much!
10. 0:58 is the end of the video, no additional information after that.
11. You haven't explained why raising the piston causes air to enter the chamber - it does so because you are creating negative pressure by raising the piston, nature doesnt like this so air is drawn in. Also, why have you drawn the piston off-centre ? I've never come across a pump that hasnt had the piston in the centre of the chamber. 
12. Thank you for the explanation, I took apart my air pump and tried to do some modification, but when I put it together,,,, surprise!!!! this will help to finish the job.
13. But how does the inlet valve open and close? 
14. That was probably one of the best explanations I have ever heard. It is so easy to follow and understand. Thanks
15. Thanks! This is helping me with my degree! Could you explain to me how a water hand pump works, i.e. how does the water from say a reservoir gets sucked and out into the outlet. Please explain in simple terms if you can. Thanks!
16. Good explanation. Thanks!
17. hey man i must say that the effort taken by the person has paid off ........u have explained the topic very well ........thankssssssss 
18. thanks bro i dont have to do my science
19. very well explained. ty.
20. thx i need this for school