jackssmirkingrevenge wrote: ↑
Mon Nov 07, 2022 11:05 am
Finally found some time to think about this and I'm happier with this design:
Hi Jack ,
Popped up few times with balanced / timed valves .
If I may ,
Had play around few things on GGDT .
Seems 2MS , dwell , or close time .
Good number .
In the instance of designing or going about such a valve .
Considerations and calcs to do so.
Where tuning could be applied .
I see in this rethink , air isn't vented to atmosphere .
The hole in the centre ,
Vented to barrel .
As in the other example you shown .
Explaining difference in dump valve and timed / balanced valve .
(Had a port to valve chamber )
Activated / assisted by hammer.
Rethink design . ( Like the hammer part is valve )
Is it then the port does two things , open and to close the valve .
Assuming by , pressure from valve into barrel .
And is it then a calculation of pressure , volume and length to size = flow rate , thus determines what size I.D. the hole is .
So for example if , the valve volume was 1.01 millilitre .
8mm i.d X 20mm heigh
Using 7 bar pressure as example .
Wanted it to close in 2 ms .
Then 1.01 ml / 1000 is 0.00101mills per milli second.
Aim is fill ) close in 2 ms .
Divide by 2 , would give 0.000505 per ms
Convert that back to per sec X 1000
= O .505
Then convert that to litres per HR .
Using this calculator here :
I get 5.058 mm for that port .
To get that 1.818 ltrs per HR .
Or am I missing the volume of port to be filled as well , then wouldnt 1/2 step .
Take 1ms to fill stem , + 1ms to fill valve chamber .
So it would work out in the wash for 2ms.
Next consideration would be the spring , how that effects .
Is this right way to look at this .