help with a piston valve

[far_cry]

at that momnt i have ball valve on my rifle
i want to biuld a piston valve (Barrel Sealing) so i have some questions
1. win i open the ball valve the fastest i colud , can this be like piston valve when i releaseing the air??
2. if piston valve performance better ,how much i can get projectile speed at 700 psi then a ball valve? (ammo 8mm 3 grams)
lits say how much faster a piston valve from a ball valve that i open it fastest i colud

sorry for my english grammar

[ALIHISGREAT]

well if you want to calculate projectile speeds, download GGDT (google search GGDT because i can't be btohered to get a link )

and a piston valve (made well) should always be better than a ball valve...

edit: mistake pimpman pointed out

[littlebro05]

well if you want to calculate projectile speeds, download GGDT (google search GGDT because i can't be btohered to get a link )

and a piston valve (made well) should always be better than a piston valve....

The program GGDT should be on spudwiki last time i check :S

have no idea what it did until now lol

[CS]

and a piston valve (made well) should always be better than a piston valve....

I think you meant to say ball valve, rather then piston valve?

1 - Yes, I believe it is of the general consensus that piston valves perform better over ball valves.

2 - Like everyone has suggested try plugging your numbers into GGDT.

[far_cry]

thanks all
i have ggdt but the problem is that she dont have aball valve in her mneu
and what i want to know ,how much faster a piston valve can be if i open the ball valve fastet i could, 5 times ,10 times ,20 times faster ??

thank you

[ALIHISGREAT]

well if you make the piston valve well i would have thought that there would be a noticable increase in performance if not a substantial increase

(and accuracy would increase as a side effect of not having to turn the ball valve so fast )