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Homemade Diaphragm for QEV

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Homemade Diaphragm for QEV

Unread postAuthor: LCTChamp » Wed Apr 22, 2009 3:38 pm

I recently bought a 3/4 QEV off of E-bay. The valve arrived but it didn't have a diaphragm or anything inside. I got a refund and the guy told me to keep the valve. I now have a QEV casing. So basically I was wondering how I could make the diaphragm? Could I just use a rubber gasket and a metal washer? There isn't much room inside, so the diaphragm would have to be quite thin. Any ideas?


Here are some pictures of the valve.
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Unread postAuthor: Biopyro » Wed Apr 22, 2009 3:45 pm

First off, have you tried looking for spare parts? The manufacturer must have replacement pistons.
If not it could be difficult - QEV pistons usually are't just a flat piece of rubber, but are contoured to fit the valve.
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Unread postAuthor: Hubb » Wed Apr 22, 2009 3:47 pm

Biopyro wrote:...QEV pistons usually are't just a flat piece of rubber, but are contoured to fit the valve.


Which means epoxy may be the answer...
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Unread postAuthor: Brian the brain » Wed Apr 22, 2009 3:48 pm

This isn;t the piston type.
It might work to just use rubber sheet.The room doesn't matter as the rubber goes inbetween the two parts, with the bolt running through it.
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Unread postAuthor: LCTChamp » Wed Apr 22, 2009 4:07 pm

Brian the brain wrote:This isn;t the piston type.
It might work to just use rubber sheet.The room doesn't matter as the rubber goes inbetween the two parts, with the bolt running through it.


This is correct it is a diaphragm valve not a piston one.


Biopyro wrote:First off, have you tried looking for spare parts? The manufacturer must have replacement pistons.
If not it could be difficult - QEV pistons usually are't just a flat piece of rubber, but are contoured to fit the valve.


I know I could order parts I just figured it would be cheaper to make my own.

So do you think a rubber gasket would work?
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Unread postAuthor: psycix » Thu Apr 23, 2009 1:04 pm

Trial and error is the way to go. Just find something that you think it works best and try it! Rubber gasket is a good option, btu make sure it is strong enough.
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Unread postAuthor: Carlman » Thu Apr 23, 2009 1:31 pm

My 1/4" dia QEV has a rubber circle and a thin sleet washer with 6 holes in it (like swiss cheese..) and thats it.
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