# Principles of valves

1. Mar 26, 2008

### Samwel

Hello to everybody!

I would like to find out how valves work but I cant find detailed information through Google.
Could you tell me on what physical principles their work is based on? Most of all, Im interested in heart valves or their analogs - reed valves. Thank you in advance.

2. Mar 26, 2008

### Integral

Staff Emeritus
Valves? Lots of different kinds of valves, do you mean vacuum tubes or solenoids? Or what?

3. Mar 26, 2008

Do you mean energy conversions like headloss or do you want mechanical construction? What kind of valves?

4. Mar 26, 2008

### Samwel

I mean mechanical valves, especially, reed valves or heart valves. Why do they work so that the liquid or gas flow only in one direction? What prevents the backflow of liquid?

5. Mar 26, 2008

### chroot

Staff Emeritus
If you look at a picture of a heart valve, it's pretty self-explanatory.

- Warren

6. Mar 26, 2008

### Integral

Staff Emeritus
Heart valves are pretty simple, similar in concept to a "duckbill" valve.

7. Mar 26, 2008

### YellowTaxi

Samwell it's just a trap-door.

You can easily push it open from one side,
but you can't do the same from the other side.

i.e. It only pushes open from one side.

8. Mar 26, 2008

### Staff: Mentor

9. Mar 27, 2008

### Samwel

Thank you very much guys for explanation!