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How do I model QEV + Slide Valve system in GGDT?

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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How do I model QEV + Slide Valve system in GGDT?

Unread postAuthor: Binary Blue » Mon Dec 31, 2012 4:28 am

I'm still trying to plan my multi-shot pneumatic and need a little help in GGDT.

I need to model the QEV + Slide Valve assembly.

Currently, I'm using settings based on JSR's post here:
http://www.spudfiles.com/forums/viewtop ... tml#358482

I'm not even sure it's correct though.

Here's the data for both the valves:
QEV:
http://www.chinapropneumatic.com/produc ... 12222.html
I'm using the QE-02 (1/4 inch) valve.

Slide Valve:
http://www.cn-lida.com/products/KS-Shuttle-valve.html
I'm using the HSV-08 (1/4 inch) valve.

My GGDT settings are attached. Can someone please tell me what to do in order to model a QEV + slide valve set up?
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qev+slidevalve.png
I'm using the "Effective Sectional Area" of the valve on its data page to calculate the seat diameter parameter in GGDT.

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Unread postAuthor: jackssmirkingrevenge » Mon Dec 31, 2012 6:11 am

Hard to get an exact model without the actual valve disassembled in front of you which you can measure and weigh. My figures should provide a good approximation though.
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Unread postAuthor: Binary Blue » Mon Dec 31, 2012 3:38 pm

So you don't need any special settings to model the slide valve's effects?
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 01, 2013 9:37 am

The problem with modelling the slide valve is that it is entirely dependent on how fast you open it, so for our purposes an approximation with a "generic" valve setting usually suffices.
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