I'm lost !! Did you have pressure last season ?? ... or is this a new system being tested for the first time ? If this is a new system it may be a design problem but if it worked brfore it should work now ... A bad electric valve could be a reason you are not getting pressure ... very sneaky they do not open all the way sometimes or the solenoid is rusted and does not open and flow enough ... open the electric valve manually .. What happens ? .. make sure all your manual valves are all the way open ... Double Check. Any leaks or broken heads ?? Check carefully could be a broken nipple somewhere. "It's a bad design .Also the impact rotor is higher than the valve(i don't know if this is allowed)" Sounds like a goofy design to me ... the rotor should not factor in much ... in theory you can subtract about .5 psi per foot of elevation above your supply source source ... the hose connection is not a good idea .. What flow do you need and how long a run ? "The wire connection is connected with duct tape and it has been raining,the controller is not working for the valve ,so i tested it manually. " Sounds messy .. get some water tight connectors at your irrigation supplier. Check fuses .. Better yet design a better system ? Good Day ..

The material the sprinkler is made of doesn't matter. You need a sprinkler that uses a smaller amount of water and that shoots far enough to cover your area. It sounds like a single stream rotor is what you want. All home improvement stores have these.

Distance between heads is about 55'. I forgot to mention when the line(3 lines total) comes out of the valve and into the yard they simply "T" off and go to each sprinkler. The sprinkler closest to the point where it tees is about 10' away where the other sprinkler is over 40' away. The line coming into the house is 3/4" copper. I'm 100% certain because I put a ball type cutoff valve in(and replaced the hose bib with a ball type) when we had to tee off for the sprinkler. Rather have a close easy to get to shutoff valve than run out to the street and fight with the valve on the meter in case something happens.

All sprinklers on all zones have weak pressure? If so it is likely a supply issue ie meter not open all the way or a master valve isn't fully opening.