irrigation manifold design flaw?

can someone diagnose the problem I am having with this manifold design?
i have adjustable sprayers but when i turn some on other turn off. there also seems to be air trapped in the system.

Do I have to connect all the backs of the pipes together to equalize the pressure? I upgraded to a huge pump so this is definitely not the problem.

thanks gentleman.

I would guess you dont have strong enough pump. How many GPH is it?

You could connect the top side with another 3/4" feed, 't'd off like the bottom, then put a 'y' in the feed line from the pump, effectively splitting the water equally to each side of the manifold. if the lines are the same length, the pressure will equalize to the centre of each 1/2" pipe.

Does that make sense?

-spek

That 3/4" header is not going to move enough water to do anything unless there are valves at every tap off the main header so you can "choke" down on the taps closest to the pump and force the water to the outer extremities. There just is not enough volume to feed that many 1/2" taps from a single 3/4" line.

imo.... you would do much better upping the main header to 1" and still have the valves at every tap off of it or run individual 1/4" lines from a 3/4" or 1" header. I feed 8 lines from a 1/2" pipe and it works quite well. Hope this helps.

Peace and Great Grows

Asmallvoice