Does anyone know the performance comparison between a 1'' moded sprinkler valve and a 3/4'' Q.E.V. ?
I can get a 1'' sprinkler valve, blowgun, and everything to attatch them for $20. The cheapest Q.E.V I could find were $50. Just trying to figure out if it's worth it.
Q.E.V. vs. sprinkler valve mod
if you pay $50 for a 3/4'' QEV then you are getting ripped off, but to answer your question a 3/4'' QEV will out proform a 1'' sprinkler valve. its not a dramatic increase in power, but it is noticable.
a 3/4'' QEV isnt worth much more than $25, but even that is a little high.
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a 3/4'' QEV isnt worth much more than $25, but even that is a little high.
edit-
they work simularly, yes, but a QEV is set up slightly differently and has more flow, even though it's outlet is smaller.I know how the sprinkler valve works. Doesn't a Q.E.V. work the same way?
Last edited by hi on Sat Nov 03, 2007 8:17 pm, edited 1 time in total.
"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote
you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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spudlauncher
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I found a website where they were selling Q.E.V.'s for $30 a peice, but you had to buy 10 minimum. Anyone know where to get them for a good price?
www.mcmaster.com if you live in the US. They probably ship to Canada too, but im not sure.
"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote
you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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potatoflinger
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Fastenal is the only place I could find around where I live, but they are expensive, 140 dollars for a 1" qev: http://www.fastenal.com/web/products/de ... ku=0443032flamerz14 wrote:How about international? Here in Singapore I only know Fasternal but it sells aluminium or zinc QEVs at around 35 a piece.
You're probably better off finding one off of ebay.
It's hard to soar with eagles when you're working with turkeys.
I recall being shown some comparison done between a modded 3/4" sprinkler and a 1/2" QEV some months back- I think it was on spudtech...
Hang on, I'll use the fancy new spudfiles tool bar to find out...
Here we are:
Hang on, I'll use the fancy new spudfiles tool bar to find out...
Here we are:
That's a major change in energy, over <sup>3</sup>/<sub>4</sub> more, just for changing the valve. I think that might well be more than worth it.For the velocity figures;
3/4" Pneumatically modded sprinkler valve, 40 CI chamber, 5' CPVC
barrel, 100 PSI, shotgun slugs for projectiles (425 grains):
376.8 fps
402.2 fps
389.6 fps
359.4 fps
413.7 fps
Average: 388.3 FPS
1/2" Quick Exaust Valve, 40 CI chamber, 5' CPVC barrel, 100 PSI,
shotgun slugs for projectiles (425 grains):
529.6 fps
487.5 fps
498.1 fps
507.9 fps
563.2 fps
Average: 517.3 FPS
3/4": 388.3
1/2": 517.3