Sprinkler Valve Low preasure

[cruzgardening]

Hi im new to the forum and i have many questions but this is the most important one i can think of that i've encounter in the past. Several months ago i installed a sprinkler system the water pressure was really good, measured 80psi i connected my main from the bottom of a 3/4 inch galvanized pipe, i used all PVC pipes, i installed one valve for the drip line and another valve for 7 sprinklers, both are in separate locations but connected from the the same main water. now when i turned on the valve manually or with a timer the valve connected to the 7 sprinklers has no pressure at all the drip line is doing great. i did many things to solve the problem but it still persists... can someone help?

[Steve]

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First off, did the system ever work properly in both zones? Also did it work properly when they were both on at the same time? As you test now, are you able to isolate the zones in your test?

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[MountainViewGreenskeeper]

my understanding from what he is saying is there is only 2 valves 1 grass 1 plants. Did it work right to begin with? If nothings leaking are u sure the heads dont need to be cleaned. You always get some dirt in the pipe in a new build.

You said drip still ok but drip is low pressure anyways. Does house still have pressure?

[cruzgardening]

Originally Posted by MountainViewGreenskeeper

my understanding from what he is saying is there is only 2 valves 1 grass 1 plants. Did it work right to begin with? If nothings leaking are u sure the heads dont need to be cleaned. You always get some dirt in the pipe in a new build.

You said drip still ok but drip is low pressure anyways. Does house still have pressure?

in the beginning i tested the whole thing before burying the pipes, like i usually do, there was no leaks, no brken pipes, i cleaned all the heads, there was a few at the ends that needed cleaning so i cleaned them all just in case, but the pressure was still low the mainline where i connected my pipes from is from under a water faucet, both the house and the water faucet have great pressure i cant put my finger on the problem, i did open the valve and checked the diaphragm like the manufacturer said but there was no debris in it everything was clean don't know what to do, my client has not complaint since there is still enough coverage but it bugs me cause i know there should be more pressure from previous jobs i done.

Originally Posted by steve

First off, did the system ever work properly in both zones? Also did it work properly when they were both on at the same time?

As you test now, are you able to isolate the zones in your test?

i have 2 valves connected so they work separately with the timer the drip line is doing good but the sprinkler line is not.

and when they where on at the same time the pressure looks the same nothing really changes.

[brian'slawncare]

have you tried spliiting them into zones. Maybe the pressure now is only strong enough for 1 or 2 heads at a time...

Also....try retesting the pressure and see what you get

[MountainViewGreenskeeper]

well if thats the case you probably have to many heads. Are they the rotary kind? I think you can only get like 5 of those on a 3/4in line. Also is it 3/4 through out the whole system? You may want to consider converting the risers and sprinklers to 1/2in that will boost your pressure back up.

what are the dimentions of the yard.

[cruzgardening]

Originally Posted by MountainViewGreenskeeper

well if thats the case you probably have to many heads. Are they the rotary kind? I think you can only get like 5 of those on a 3/4in line. Also is it 3/4 through out the whole system? You may want to consider converting the risers and sprinklers to 1/2in that will boost your pressure back up.

what are the dimentions of the yard.

the dimesions are 20x10 its a small rectangle i have 6", 1/2" risers that spread to 10 feet, the whole system is 3/4" and the sprinklers are 1/2" dont know what to do i might have to dig out the whole system and reinstall it.

Originally Posted by brian'slawncare

have you tried spliiting them into zones. Maybe the pressure now is only strong enough for 1 or 2 heads at a time...

Also....try retesting the pressure and see what you get

i tested the house pressure its good 80psi and the faucets psi is also 80 spliting the zone was in my mind but i might as well install a brand new set up and deal with the problem once and for all thanks though

[MountainViewGreenskeeper]

Originally Posted by cruzgardening

the dimesions are 20x10 its a small rectangle i have 6", 1/2" risers that spread to 10 feet, the whole system is 3/4" and the sprinklers are 1/2" dont know what to do i might have to dig out the whole system and reinstall it.

Well my guess is to many heads on 1 line. If you do dig it up just put in another valve and dig up the closest 3-4 heads cap them off and put the new ones on the new valve.

The sad part in all this is I bet one head less and you have all the pressure you need. Speaking of that grab a female cap(or 2) and cap off 1(or 2) of the risers and see if that helps.

[cruzgardening]

Originally Posted by MountainViewGreenskeeper

Well my guess is to many heads on 1 line. If you do dig it up just put in another valve and dig up the closest 3-4 heads cap them off and put the new ones on the new valve.

The sad part in all this is I bet one head less and you have all the pressure you need. Speaking of that grab a female cap(or 2) and cap off 1(or 2) of the risers and see if that helps.

i went back today to check out the property the grass is growing fine and water is well delivered but the pressure still low.

i capped 1 sprinkler nothing i capped 2 nothing i capped 3 and pressure went up... thats only 4 sprinklers for that one valve!!! no freaking way! any ideas? im so stuck...

[MountainViewGreenskeeper]

Originally Posted by cruzgardening

i went back today to check out the property the grass is growing fine and water is well delivered but the pressure still low.

i capped 1 sprinkler nothing i capped 2 nothing i capped 3 and pressure went up... thats only 4 sprinklers for that one valve!!! no freaking way! any ideas? im so stuck...

Well put those 3 on a different valve. Thats all you really can do.