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Old 01-03-2013, 03:03 PM   #1 (permalink)
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IVG questions

Gentlemen,

How exactly does an IVG govern velocity? I know that it controls the speed and force of the hammer, but does that translate into the valve being open longer, making for more air pushing the ball meaning more velocity or...?

And if so, would it be possible to have an IVG-like device on the valve spring instead? a tighter turned in means less time open for the valve, farther out means less time...

thoughts?
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Old 01-03-2013, 03:14 PM   #2 (permalink)
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Adjust the IVG/force applied to hammer doesn't simply increase the dwell - it also matters what the input pressure to the valve and valve spring are like (i.e. sweet spotting, there is a certain point where increasing pressure behind hammer won't increase dwell any further). Until the point of "sweet spot" is reached in terms of valve input and IVG/main spring pressure behind hammer equilibrium, turning in the IVG as you posit will increase dwell. At a certain point it does not significant do so any more, however, that's what's referred to as a the sweet spot.
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Old 01-03-2013, 04:00 PM   #3 (permalink)
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Hrm. Alriiight..... I guess what I'm trying to ask is something like, would having an adjuster on the valve spring allow for the adjustment of velocity AFTER the reg has been sweetspotted. also, this is for a custom build, so if you have any ideas please let me know.

Also, where would I get a 12g valve like the type used in a 12g changer?
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Old 01-03-2013, 04:32 PM   #4 (permalink)
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There is no valve in most 12g changers. Most common are bucket changers. There are some that come with back/check valves in them (ball bearing and oring). Do you mean pierce seal or pin?

You could hypothetically add an adjustment for the valve spring, but it wouldn't make things any easier on you as far as I can really tell. I imagine you could use it to adjust velocity, but why not just do this via the IVG?
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Old 01-03-2013, 10:03 PM   #5 (permalink)
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I believe I do. never knew what it was called till now.

The build I'm making would be able to use either, but greatly benifit from being able to adjust velocity from the valve instead of hammer.
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Old 01-03-2013, 10:10 PM   #6 (permalink)
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the only benefit i could see from being able to a "valve IVG" is not needing to change out valve springs for a lot of tinkering. That being said, every time you adjust the valve IVG you'll be changing the sweetspot, which isnt necessarily desirable.
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Old 01-03-2013, 10:34 PM   #7 (permalink)
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^well said!
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Old 01-04-2013, 12:31 AM   #8 (permalink)
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alright, thanks.
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Old 01-04-2013, 04:25 AM   #9 (permalink)
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btw, what would be more interesting than an adjustable valve spring would be a zero-force or "balanced" poppet type valves. this would allow your hammer to operate at much, much lower force. there are a number of benefits to this, although getting it setup correctly can be a challenge, so they're far from guaranteed and ymmv. Here's a link to ydna's take on the concept in, I believe, a nerve and impulse:

ZDS Paintball - Custom Work Gallery - Balanced Poppet Valves

If you're into it, I am certain that would be a more fruitful, challenging and overall fun addition to your custom project. Plus it would make it rather unique, if it's possible to integrate into your project concept gun to begin with (i.e. I'm assuming you're working with a poppet valve type platform like autococker/sniper or angel/spyder/impulse).

EDIT: I seem to remember that he has more info on this type of mod/project, the balance poppet valve I mean, but I can't seem to locate it atm. Look around, you might be able to.
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Old 01-04-2013, 10:18 AM   #10 (permalink)
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THANK YOU.

The only downside to this that I could see is that the usage of air would reduce the efficiency of the 12grams used.

I'm going to brainstorm an alternative type of valve I think.

Or I could always use a nelson type.
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