Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Landscaping & Lawn Care

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 06-05-2011, 04:26 PM   #1
Newbie
 
Join Date: Apr 2011
Posts: 23
Share |
Default

Irrigation valve low pressure


Hi.

I have a 4 zone Rainbird irrigation system. Two valves are side-by-side on the left side of the house and two valves are side-by-side on the right side of the right.

Had a lighting strike last year that took out the control panel and two valves on the left side. Replaced the control panel, and solenoids on both valves. Both zones came back up with full pressure.

Had a recent lightning strike on the right side of the house that took out the control panel and valves. Replaced the control panel, and solenoids on both valves yet only have low pressure as opposed to the full pressure that I had when I did this last year on the left side of the house. Go figure!

I took the diaphram out of both valves and checked for dirt/debris. I also ran the valve with the solenoid off to clear any blockage. Still, low pressure.

Just bought replacement valves from Home Depot yet hate the thought of having to dig out all the dirt around the valves and then do the cutting and then re-glueing of the pipes leading into the new valve.

Please tell me there is an easier way to fix this problem!!!!!!!!!

Thanks much!!!!!!!!!!!!!

Scott

tatums4 is offline   Reply With Quote
Old 06-06-2011, 03:22 PM   #2
Don't know it all, yet!
 
Join Date: Jun 2008
Location: Metro Atlanta, GA
Posts: 910
Default

Irrigation valve low pressure


You have low pressure at the valves or low pressure at the heads? Work your way from one end to the other and try to isolate where your pressure problem begins.

Some folks say I have a good imagination but I could even see having a line bursted somewhere along the way.

__________________
If it's worth doing, it's worth doing right. If you wouldn't put your name on it, it ain't done right!
downunder is offline   Reply With Quote
Old 06-06-2011, 04:12 PM   #3
Newbie
 
Join Date: Apr 2011
Posts: 23
Default

Irrigation valve low pressure


Thanks for the reply!

The heads have a hard time popping up and when they finally get out, the water pressure coming out of them is low.
tatums4 is offline   Reply With Quote
Old 06-06-2011, 05:21 PM   #4
Don't know it all, yet!
 
Join Date: Jun 2008
Location: Metro Atlanta, GA
Posts: 910
Default

Irrigation valve low pressure


How is pressure at the valve?
__________________
If it's worth doing, it's worth doing right. If you wouldn't put your name on it, it ain't done right!
downunder is offline   Reply With Quote
Old 06-06-2011, 05:41 PM   #5
Newbie
 
Join Date: Apr 2011
Posts: 23
Default

Irrigation valve low pressure


That's a good question!

How do measure the pressure at the valve?

Thanks, again!
tatums4 is offline   Reply With Quote
Old 06-06-2011, 06:22 PM   #6
Don't know it all, yet!
 
Join Date: Jun 2008
Location: Metro Atlanta, GA
Posts: 910
Default

Irrigation valve low pressure


You could get a pressure gauge for $10 but I was thinking of a general comparison of how strong it seems to be at each valve. Just open each as you would for flushing it out and see if all seem to flush about the same. Basically just a process of elimination to see where the blockage/leakage, etc is.
__________________
If it's worth doing, it's worth doing right. If you wouldn't put your name on it, it ain't done right!
downunder is offline   Reply With Quote
Old 06-06-2011, 07:14 PM   #7
Too Short? Cut it Again!
 
Join Date: Sep 2009
Posts: 9,635
Default

Irrigation valve low pressure


Quote:
Originally Posted by downunder View Post
Some folks say I have a good imagination but I could even see having a line bursted somewhere along the way.
Not sure you are imagining. It sounds like a cracked pipe or something and dirt, sand or whatever has gotten in to keep the heads from popping up?

Lightning should not be causing pressure problems if you replaced the electrical components. Do run the valves manually with the little bleed screw.
user1007 is offline   Reply With Quote
Old 06-06-2011, 07:48 PM   #8
landscape guru
 
Join Date: Nov 2010
Location: Norfolk, VA
Posts: 9
Default

Irrigation valve low pressure


Regarding the valve exCHANGE, just replace the guts. Beware of all the crapola that comes from Home Depot. Install a quality valve such as a Rainbird DV series or a Hunter PGV series.
ClassicLighting is offline   Reply With Quote
Old 06-11-2011, 04:27 PM   #9
Newbie
 
Join Date: Apr 2011
Posts: 23
Default

Irrigation valve low pressure


Thanks for all the replies!

Here's the latest: I flushed/cleaned out both valves and replaced the diaprhams in each valve. YET, and that is a big YET, both valves/zones still have the same low pressure!

Sooooooo, here's my question again: After a lightning strike on a tree on the right side of the house wherein 2 of the valves (out of 4) are located within 10 feet of the tree that was hit, those 2 valves/zones have low pressure. After the lightning strike, I replaced the control panel, and the solenoids on both valves, (which solved the same problem I had on the left side of the house when lightning hit a tree last year on that side!).

Sooooooo, why would, last year on the left side, replacing the control panel and solenoids solve the problem, yet this year on the right side, doing the same thing does not solve the low pressure problem?

Thanks, again, for everyone's help!!!!!!!!!!!!!!!
tatums4 is offline   Reply With Quote
Old 06-12-2011, 04:05 PM   #10
Don't know it all, yet!
 
Join Date: Jun 2008
Location: Metro Atlanta, GA
Posts: 910
Default

Irrigation valve low pressure


My apology here but somehow I read your original question that you had low pressure on the right side only.

So, just to be clear when you say "both valves/zones still have the same low pressure" do you mean the right side zones or all four zones? At the risk of sounding dense, exactly where do you have low pressure?
__________________
If it's worth doing, it's worth doing right. If you wouldn't put your name on it, it ain't done right!
downunder is offline   Reply With Quote
Old 06-12-2011, 04:26 PM   #11
Newbie
 
Join Date: Apr 2011
Posts: 23
Default

Irrigation valve low pressure


Hey downunder, thanks for all the help!

My 4 zone system consists of having 2 valves on the left side of our house and 2 valves on the right side of our house.

The lightning strike that hit one of our trees on the right side of our house blew out the irrigation control panel in our garage and also blew out the solenoids on each of the 2 valves on the right side of our house. Hence, after replacing the control panel and solenoids for each valve, the 2 zones they control started working yet each zone had low water pressure coming out of the heads.

Since the 2 valves on the left side of our house and the zones they control work with full pressure, do you think the wiring for the valves on the right side may have been damaged slightly? Just odd that those zones controlled by those valves both have low water pressure after the strike. Hence, I was thinking maybe the wiring is not getting the full electricity to the valves to open them up all the way.

Thanks, again!

Scott
tatums4 is offline   Reply With Quote
Old 06-12-2011, 04:58 PM   #12
Too Short? Cut it Again!
 
Join Date: Sep 2009
Posts: 9,635
Default

Irrigation valve low pressure


Have you actually taken an electrical tester to your transformer, controller and wire at the valve ends? If you don't own one, this might be the project to justify getting a tester. You do not need anything fancy but get a good one.

Check the outlet the transformer is plugged into also I guess. Why only one side of the house would be effected is baffling other than that if it is furthest from the transformer and controller you may be losing power through some lightning damaged wire I guess. Weird though.

The power to the solenoid/actuator should just cause it to open and close. You adjust the flow rate manually.
user1007 is offline   Reply With Quote
Old 06-12-2011, 05:44 PM   #13
Don't know it all, yet!
 
Join Date: Jun 2008
Location: Metro Atlanta, GA
Posts: 910
Default

Irrigation valve low pressure


As SD mentioned, the wiring and solenoid simply open and close the valve. I hate to say it, but I'm still thinking toward a cracked supply line between the solenoid/valve and the heads.

My experience with valves is:
Sometimes dirt can wash under the diaphram and prevent it from closing completely resulting in a slow leak (like a worn washer at a faucet).
The diaphram may stick open or closed.
The diaprham is ruptured.
Solenoid can go bad, preventing operation similar to a bad light switch.

Since I understand you have replaced all these parts and are still having a problem I would disregard a valve issue.

One way of checking pressure (with a little trouble, relatively) would be to get a $10 pressure gauge. Get the appropriate connectors for your system and disconnect the weak head and check the pressure there. Do the same at a good head. If they are significantly different (more than one or two psi), go to the valve and do the same thing.

I.E, if you are getting 60 psi at a good head and 45 psi at the other, then check the psi at the out side of the valve to the weak head. If you are getting 60 psi there and 45 at the head, the problem is somewhere in between.

Adapter bushings are readily available for $2 or so. You should be able to put all this together for well under $20, much cheaper than a plumber! Even if you have to cut the line open then repair it, it shouldn't be much trouble.

Get an EZ span to repair the opening. Open it all the way (kind of like a shock absorber) and mark the max extension on your supply line, then close it all the way and mark the min size. That will give you your cut marks then glue and push on to line up with the max marks.
__________________
If it's worth doing, it's worth doing right. If you wouldn't put your name on it, it ain't done right!
downunder is offline   Reply With Quote
Old 06-12-2011, 06:16 PM   #14
Too Short? Cut it Again!
 
Join Date: Sep 2009
Posts: 9,635
Default

Irrigation valve low pressure


As hinted in my last post, you did not mention that you tested or replaced the low voltage transformer. If the two valves working a closest the transformer you might just be getting lucky with them and enough current is making it to the solenoids. If the others are on the other side of the house from the transformer you may be losing adequate power just over the wire run if the transformer is not kicking out what it should in terms of power.

Otherwise, I agree. The problem has to be in a water line I should think.

user1007 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pressure Reducing Valve Woes BentSpace Plumbing 4 01-26-2011 07:59 PM
Help! Water Heater Pressure Relief Valve leaking mmoore58 Plumbing 4 01-02-2011 12:30 PM
Boiler pressure relief valve leaking Jaschance HVAC 3 02-08-2010 10:05 PM
Replaced PT Valve but now have water pressure issue krisdiy Plumbing 3 09-17-2009 01:42 PM
do Pressure Reducing Valve fail? wazeaz Plumbing 5 02-10-2008 05:57 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.