QEV with Inflator

[HoppinS10]

I was looking at some CAD drawings made by dewey-1 and noticed one of his drawings http://sketchup.google.com/3dwarehouse/ ... revstart=0 had which looks to be an air inflator hooked directly up to the pilot side of a qev. My question is does this act like a 3-way spool valve? I tried searching for this with no luck.

[Gun Freak]

No, the blowgun/inflator is only a pilot valve.

[HoppinS10]

So it only dumps the pilot area so the gun fires?

[Gun Freak]

Yep, but some blowguns can be modified into 3 way valves, although you'd be better off just getting a proper 3-way.

[dewey-1]

No, the blowgun/inflator is only a pilot valve.

It can be used as inflator using the trigger handle.

Then it can be used as a pilot valve by using the pushbutton.

How these work as a tire inflator is to fill with trigger until desired pressure.
If you happen to over inflate you can use the button to release the pressure to desired pressure.

In other words it has two valves in it.

[Gun Freak]

Ahh, ok cool, I didn't know.

[jackssmirkingrevenge]

Have you considered fitting a spring to the QEV and adding a small equalisation hole, then feeding air through the chamber side?

Damn sight cheaper than looking around for a 3 way valve Here'san example of the concept, courtesy of Brian the Brain.

[HoppinS10]

Have you considered fitting a spring to the QEV and adding a small equalisation hole, then feeding air through the chamber side?

Damn sight cheaper than looking around for a 3 way valve Here's an example of the concept, courtesy of Brian the Brain.

I have considered doing this. I took the valve apart the other day and got nervous about putting a hole in the diaphram. Will this work with a QEV from mcmaster? It looks like most people are using the "european" style QEV's

[jackssmirkingrevenge]

If you're worried about modifiying the original diaphragm, you could always make your own out of suitable material