Help with a QEV

[AircannonSweden]

I made this QEV yesterday and I can't get this sealing leak-free...what can i use for material? The piston is kinda big but it is still under construction

Piston and housing



"sealing"

[MrCrowley]

Is the piston even larger in diameter than the seat?

[jackssmirkingrevenge]

By "piston" do you mean half-digested piece of rubber superglued to a capacitor

[AircannonSweden]

MrCrowley: The piston fits perfect in the housing,when i push the piston forward it is air-tight but when i fill a tank with air(3 PSI or something)it will leak...Well,i should see if a find another material

jackssmirkingrevenge: Haha yes i have made one more piston that is much shorter,i have taken out that material in the capacitor and filled it with hot-glue insted...I going to Stockholm today and i maybe found something there

[MrCrowley]

3PSI isn't enough, try 30.

[jonesy42]

You can buy QEV's on ebay for less than $15! (search quick exhaust valves).
I don't know why people bother "making" qev valves when
they are fairly cheap to buy?....,But thats in my opinion of course,
good luck anyway

[Crna Legija]

You can buy QEV's on ebay for less than $15! (search quick exhaust valves).
I don't know why people bother "making" qev valves when
they are fairly cheap to buy?....,But thats in my opinion of course,
good luck anyway

homemade one IMO preform better at least well made ones.

[AircannonSweden]

MrCrowley: Thank you,it worked with higher preassure

jonesy42: I have already built a cannon with a QEV from ebay

[Mr.Tallahassee]

You can buy QEV's on ebay for less than $15! (search quick exhaust valves).
I don't know why people bother "making" qev valves when
they are fairly cheap to buy?....,But thats in my opinion of course,
good luck anyway

Good luck finding a QEV with porting larger than an inch for less than an arm and a leg.

[mattyzip77]

Do you go on e bay? I just got two 1 1/2 inch pulse valves for 30 dollars shipped. I have never seen a qev bigger than 3/4 of an inch. After that size they are called diaphragm valves.

[Mr.Tallahassee]

Do you go on e bay? I just got two 1 1/2 inch pulse valves for 30 dollars shipped. I have never seen a qev bigger than 3/4 of an inch. After that size they are called diaphragm valves.

A diaphragm valve is not the same as a piston valve. Apples and oranges cannot be compared. They are similar in principal but they aren't the same. What I'm saying is that I can go buy steel pipe and fittings and make a 2'' ported piston valve for less than the cost of a commercial 2'' valve that also performs better. Why buy something and make do with it when you can build a better one the way you want? The latter just makes more sense to me.

[dewey-1]

Do you go on e bay? I just got two 1 1/2 inch pulse valves for 30 dollars shipped. I have never seen a qev bigger than 3/4 of an inch. After that size they are called diaphragm valves.

Mead make a 1 inch.
Very expensive though.
http://www.mead-usa.com/products/detail ... =46&type=3

[PVC Arsenal 17]

By "piston" do you mean half-digested piece of rubber superglued to a capacitor

That is priceless. Clever job OP

[mattyzip77]

Do you go on e bay? I just got two 1 1/2 inch pulse valves for 30 dollars shipped. I have never seen a qev bigger than 3/4 of an inch. After that size they are called diaphragm valves.

Mead make a 1 inch.
Very expensive though.
http://www.mead-usa.com/products/detail ... =46&type=3

Dewey your always making a liar out of me...

[AircannonSweden]

This is what i came up with,it is piloted by a 1/2" ball valve!