QEV's... How do they work?

[c9d]

I would like to know how these valves work.

[Eddbot]

Read this.

And The Wiki.

[c9d]

So how could I apply this to a piston valve?

[MrCrowley]

I would like to know how these valves work.

I like to know how things work too. That's why I research instead of asking people who have better things to do then answer such an easily researchable question.

edit:

So how could I apply this to a piston valve?

QEV's are either piston valves or diaphragm valves. Both work on exactly the same principle. So when you ask how you can apply this to a piston valve I wonder if you have any idea what you actually are doing.

One way you could apply it to a piston valve, is to pilot the piston valve. But you probably don't know what that is either since you haven't been doing nearly enough research.