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differences in qev brands

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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differences in qev brands

Unread postAuthor: grumpy » Wed Nov 21, 2007 5:22 pm

well a friend of mine gave me a couple of qev's , all the cannons that i have built have been with sprinkler valves, so i don't realy know to much about them and after spending the last couple of hours searching and reading the everything i could find about them i only have one question. is there a big difference in perfomance between the different qev manufacterers? the ones i was given are 3/4 humphrey qev's and look this.
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Last edited by grumpy on Wed Nov 21, 2007 5:38 pm, edited 2 times in total.

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Unread postAuthor: thespeedycicada » Wed Nov 21, 2007 5:28 pm

I wouldn't know that but qev's as far as i know have better performance than sprinklers so i would just use them regardless of the manufacture.And i dent really think the manufacture would make too much of a difference.
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Unread postAuthor: ALIHISGREAT » Wed Nov 21, 2007 5:40 pm

well it depends what the flow is etc. also the pilot has a big effect on opening times. However unless the designs are radically different there probably won't be much of a difference between brands.
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Unread postAuthor: Infernal Maveric » Thu Nov 22, 2007 7:20 am

The manufacturer has no real impact on the QEV only whether or not it was a diaphragm or piston QEV, as 'phragm QEVs has metal restrictors build into the exhaust and fill in/output.

The only other thing that might make a difference in manufacturers is the piston weight in the QEV. Obviously, the lighter the piston, the better a QEV will function.
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Unread postAuthor: psycix » Thu Nov 22, 2007 8:56 am

Brands might only differ like 20% on the opening time or flow, but no more.
Its a QEV, it rocks, and you should use it!
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Unread postAuthor: grumpy » Thu Nov 22, 2007 4:26 pm

thanks for the responses guys, i guess i'll have to come with something to use one on and try it out. especialy since i have to put my other project on hold till after christmas.
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Unread postAuthor: clide » Thu Nov 22, 2007 11:20 pm

One of the nice things about QEVs is that the manufacturer often lists their flow rate on their websites, so you could probably look up your specific valve and compare it against others.
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