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1 inch QEV Mead

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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1 inch QEV Mead

Unread postAuthor: dewey-1 » Thu Aug 20, 2009 1:55 pm

Here is another source for QEV's in the US.
Note that they now have a 1" size available.
It appears to be constructed like a "piston" style rather than diaprhagm style that is typical in the US.

Anybody familar with these?

http://www.mead-usa.com/products/detail ... =46&type=3
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Last edited by dewey-1 on Thu Aug 20, 2009 2:29 pm, edited 1 time in total.
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Re: 1 inch QEV Meade

Unread postAuthor: Technician1002 » Thu Aug 20, 2009 2:04 pm

dewey-1 wrote:Here is another source for QEV's in the US.
Note that they now have a 1" size available.
It appears to be constructed like a "piston" style rather than diaprhagm style that is typical in the US.

Anybody familar with these?

http://www.mead-usa.com/products/detail ... =46&type=3


1 inch is nice. From the PDF they show the "Piston" It's the short fat puck with wings commonly used in most QDV's.
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Unread postAuthor: dewey-1 » Thu Aug 20, 2009 2:25 pm

The only concern I have is they do not show any replacement parts.

I used their 3/4" version for the 3D CAD library.

Maybe I will just have to get one to create a 3D model and see how it performs, that is if it is not to unreasonably priced.

I think they still consider the "puck with wings" a diaphragm as far as terminology goes. I have not really located any references otherwise.

Tech, have you seen anything? If so please post a link.
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Unread postAuthor: Hotwired » Thu Aug 20, 2009 2:57 pm

Not many places do replacement parts for QEV's. I only know one supplier in the UK which does replacement pistons.

They are called diaphragms but the whole object physically moves as opposed to flexing a large diameter rubber sheet and is not retained at any point. Hence the piston term which gets used.
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Unread postAuthor: dewey-1 » Thu Aug 20, 2009 3:29 pm

Hotwired wrote:Not many places do replacement parts for QEV's. I only know one supplier in the UK which does replacement pistons.

They are called diaphragms but the whole object physically moves as opposed to flexing a large diameter rubber sheet and is not retained at any point. Hence the piston term which gets used.


That is the best explanation I have seen so far to really differentiate the two types!

A sliding diaphragm verses a mounted diaphragm!
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Unread postAuthor: POLAND_SPUD » Thu Aug 20, 2009 4:43 pm

they are common in europe.... but the largest size is/was 3/4"...

in my opinion they are the best QEVs out there - because they seem to be more compact and lighter than other models
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Unread postAuthor: Brian the brain » Thu Aug 20, 2009 4:43 pm

Often referred to as a shuttle rather than a piston
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