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I have one zone in my sprinkler system that has low pressure. I have changed the control valve and its the same. No signs of broken lines.

These are home depot valves and seem so work fine but the pressure is low and won't pop up the sprinklers.

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If it is a anti-siphon valve remove the anti-siphon cap and let it rip. Remove cap on adjacent valve and let it rip check to be sure the gieser is identical. If so let it run for a long time the leak will eventually show up. Because if it worked before and doesn't work now it has a leak. Water takes the path of least resistance. I have had them access the landscape drain before and you the leak didn't appear until it emptied at the street or followed a gopher hole a few hundred feet before surfacing. Listen carefully you will probably hear it.

If water just dribbles over the anti-siphon portion with cap removed it is still not opening flow control know may be turned down. In fact I would check to ensure this isn't the entire problem turn ir counter clockwise until it stops. This is the round know in the center of the valve.

Posted on Apr 09, 2014

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What is required to winterize my yard sprinkler system.? WILL MY PIPES BURST IF SYSTEM IS SHUT DOWN..??


That depends on what was installed. Some systems have a drain at the end of each circuit or zone. When there is no water pressure, the drain opens and lets the water in each line run out. If you have this then you only need to make sure that the main line supplying the water to the valve manifold is drained. If you are not sure, then you need to hook a large compressor to the system and blow the whole thing out. Usually there is a connection at the vacuum breaker that you hook an air hose to, shut off the water inside the house and then turn on the compressor, when it builds up enough pressure you turn each circuit or zone on and let the air drive the water out. When the zone is done, you move to the next one.

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Installed valve to water supply then added faucet bib thenthe sprinkler supply line water enters valve but no water out to sprinklers


You might have missed some constrictions. Try blowing out the zone with compressed air to make sure it's clear.

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It is likely the water pressure is low (perhaps a leak in the irrigation pipe) or simply the spring is stuck. Wonder if you have more than one sprinkler connected and if all are having the same problem.

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Zone 1 stays on all the time even while other zones go


Sprinklers and valves can get clogged. First turn off your controller, then remove Zone 1's valve... see if you can determine if it is clogged. Then clear the clog or replace the valve.

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One zone has low pressure


Try getting information from the manufacturer.

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I have Intermatic sprinkler model T8845pv. I want to set it for daily watering in only one of 8 zones. When I remove the gold pins in the main dial and locate the zone I want to water, it waters the...


Intermatic sprinkler timers are 24 hour repeat cycle, with day-skipper option.
The timer does not change zones. The timer just turns ON-and-OFF at scheduled times.
Each tripper represents 12-15 minutes of watering. And then the timer circuit turns OFF.
When timer circuit turns OFF, the sprinkler system is designed to advance to next zone each time.
So when the timer circuit turns OFF and then turns ON again, your sprinkler control starts watering the next zone. This is the way sprinkler systems are designed.
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#sprinkler

If you had a sprinkler system with 1 zone, or could change your sprinkler system to 1 zone on certain days, then the timer would turn that zone on-off each time.
Call a local sprinkler company and see if they have a dual control or some solution >> but sprinkler controls are outside my area of expertise. I am timer expert.

You could solve problem with two separate sprinkler systems, but that would require two timers. I have never seen a 2-channel sprinkler timer. There are electronic two-channel timers that can handle two different programming schedules with minimum 1 minute on-off, and these timers can cost a few hundred dollars up to thousands, PLUS cost of the dual sprinkler system. Add a comment and let me know if two-channel timers are something you want information on.

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I have low water pressure on my rainbird sprinkler system. how can i adjust it?


There are several ways to adjust water pressure on sprinkler systems. First you have to determine if there is a problem with the sprinkler system itself. Things to look for:
1.) make sure that all valves including the main are all the way open.
2.) Inspect the sprinkler heads for clogging. Sediment and debris can also clog your sprinkler heads. Some debris removal may be required.
3.) You make have too many sprinklers operating by one valve. You may need to divide a zone and add another valve to increase water pressure.
4.) If all else fails. You can install a breather intake cap to allow air into your sprinkler system thus increasing GPM (gallon per minute)flow.
5.) one of the biggest mistakes that peopel make is that they undersize the water pipe size to save money. Typically you want to use 3/4" PVC pipe for your main runs and tee into 1/2" PVC for your sprinkler heads.
Good luck. I hope this helps.

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I have 1 and 1/2 horsepower sprinkler pump that wont prime. As soon as the end piece fills, it will empty if I open the end to the sprinkler.


I don't know what is your system set up. However, the system set up should be the following;
1. Your 1-1/2HP sprinkler pump must be installed at
a fix location nearest the water source. (Complete
with power and plumbing lines.)
2. At the end of the suction line is a vertical check
valve with strainer.
3. The suction pipeline must be connected to the
suction port of the pump.
4. At the discharge port, a flow control valve tee must
be installed. The flow control valve tee top is
covered with a plug, which serves as the priming
port when opened.
5. After the flow control valve, connect a short nipple
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flow or allow the water to flow. You may connect
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the pressure hose going to the sprinkler.
6. To prime the pump, open the plug at the flow
control top. Fill it full with water, replace the
priming port plug.
7. Turn the flow control valve to full closed position.
8. From full close position, switch the power on.
9. The pump now run on and off due the pressure
switch setting. Slowly open the flow control valve
such that the water pressure remains steady.
10. Take note of the pressure.
11. Shut the power off, and connect the sprinkler
pump hose.
12. Put the power back on, and allow the pump to
run with the sprinkler.

Under this set up, you can run the sprinklers when your pump is running. Hope this will solve problem.

Dec 08, 2009 | Plumbing

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