My Sprinkler Heads Weep Water

Understanding Automatic Sprinkler Systems

If you have a weeping head, there are a couple of possibilities to consider.  If the heads that are always wet are located at the bottom of a slope, they may be subject to low head drainage.  This implies

that when the zone finishes watering, the residual water remaining in the lateral line drains to the lowest point in the line. Depending on the length of the line, it could be a little or a lot of water.  If it's a lot, it can take a while to trickle out of the low head(s).

The other possibility is that the sprinkler valve is leaking.  (commonly called a weeping valve).  This occurs when the valve diaphragm doesn't completely seal against the seat allowing just enough water to continually flow through the valve to your sprinklers.  This is typically caused by either Debris in the valve or a faulty diaphragm causing the diaphragm to not seal properly.

Solution  

You can try to open up the valve and see if there is anything in the valve. Be  sure to first Shut off the water. Also remember, clean is everything, sand, dirt or small pebbles can also cause the diaphragm to not seal. Therefore, before you take the valve apart, make sure you have open space around and below the valve, to prevent the surrounding soil from washing in.

                                                                           

My personal belief is that it is better to switch the whole assembly from a new valve of the same model. This should also include the solenoid, and (on some valves) the diaphragm seat that pops into the lower valve body.

Disclaimer

By using this information you agree to hold the author, as well as Aldape Sprinkler Service, Landscape & More LLC harmless from any and all accidents or injuries that may occur from said use.  You furthermore agree that the information contained herein is intended as a reference only! And that it is not a replacement for professional sprinkler service. If you choose to repair your own sprinklers, you may use this information at your own risk.  Damage to your system and/or accidents from unexpected water pressure, electrical shock, or pipe solvent mishaps can occur and result in injury. It is strongly recommended that safety glasses are worn at all times.