Help if you can

[s18022]

I am building a gun (better refered to as a cannon sinse it is like 15ft long) that i need to get a valve for it, it is a 4inch * 5ft tank and a 2inch *8ft barrel And the hand valve i got doesn't work(no real suprise) but i was wondering if you thought that two sprincler valves would work. so it would break into 2 3/4 inch piches go to the valve and then go back to the barrel.
Thanks for any replies

[LucyInTheSky]

You could use a 3" sprinkler valve

[s18022]

Where would you get e 3 inch sprinkler valve cuz if you can i am there.
Thanks

[LucyInTheSky]

Dont know were you get them, im from the uk so i dont use them but that BIG NASTY gun has 2 of them on.

[squeaks]

ok, first of all, 3 inch sprinkler valves cost upwards of $400. Second, even 2 1" sprinklers would have constriction on your air flow. It's all about surface are of a circle, r^2pi. a 2 1" valves would have the surface area equivelant of 1/2 pi. A 2" valve would have the surface are of pi. So, what I'm suggesting is pay $120 for a 2 inch sprinkler, buy a supah/mauler valve, or make your own piston/diaphram valve.

[Velocity]

ok, first of all, 3 inch sprinkler valves cost upwards of $400. Second, even 2 1" sprinklers would have constriction on your air flow. It's all about surface are of a circle, r^2pi. a 2 1" valves would have the surface area equivelant of 1/2 pi. A 2" valve would have the surface are of pi. So, what I'm suggesting is pay $120 for a 2 inch sprinkler, buy a supah/mauler valve, or make your own piston/diaphram valve.

<a href="http://www.sprinkler.com/buy/item/irrit ... 0">Upwards of $400? I think not</a>

[c19o]

make a piston valve