Bump. :)

Hello again.
It's strange to be posting here again after all this time. I was prompted to visit back again after coming across a few (potential) airgun parts I came across during a clear out and got all nostalgic about my old copper spudgun (whereabouts now unknown).
Anyway, what I came ...

That's a beast!

Thanks for the help. After using my head a little, I came up with some figures which I think are reasonable.
Is there anything in the screenshot which looks unrealistic to anyone?

saefroch wrote:

Slugfoot wrote:What would I enter for a given CV of 7.5, say?

File -> Configuration -> Valve flow parameter -> CV

Okaaay...Thanks. :confused1:

Some manufactures list the CV value and some list the SCFM flow value, so even the specs are not very standardized. Then to complicate things, the CV in GGDT is a % of CV, not the actual CV value you will find on a valve manufacture site.
I don't understand. What would I enter for a given CV of 7 ...

I didn't want to hijack Mr.michael.2468's thread but what the hey... sorry. :wink:

What I'm confused about is what to enter for the values 'Valve Type', 'Flow coef' , 'Dead Volume' and 'Piston Mass' (I don't have any scales).
The setup I intend to use would be a "European" style 3/4" QEV piloted ...

Thread noted.

You're not the only one confused by it.
I too would love to be able to use GGDT but have no idea what values to enter into the valve area for my intended configuration. :scratch:

^ Thanks for that. :thumbleft:

I've never had anything to do with plastic launches but I believe this place may be useful to you.

http://www.pipestock.com/

Vincenzo wrote:It's been done before, a few times.

Did it work? - I'd be interested in reading the threads if I could find them.

...Acknowledged.
But, I'm also thinking now that one needn't use a commercial cylinder. One could cut the bottom off an old shock pump (using the piston and rod to attach to the ball valve lever) and fix it to a qev with a compression fitting - voila, a full bore pneumatic cylinder. An exhaust port ...

Bumped - To save starting another thread.


It is apparent that ball valves have superb flow characteristics and I see that a number of people have spring-loaded them (with success) in order to open them faster.
I was wondering if anyone has thought of firing them open with a small qev attached to ...

Aaaaaah........

I'll probably have to send off for some fittings when/if the time comes - I'm not very good at bodging.

Naah wait... I did a quick google search and it seems that enot nuts and sleeves are just compression fittings

http://www.airlink-compressors.co.uk/products/norgren-enots-tubing-nut -imperial

So I guess it has standard 1/2" BSP threads

Aaah...All is good then. I was wondering where I was going ...

Just noticed this -

"This item requires Enots nuts and sleeves for all three ports on this valve. "

Is anyone here familiar with Enots threads etc.? I've never heard of them before. I'm just hoping I'll be able to buy BSP/metric adapters for it. :confused1: