Anyone familiar with Weathermatic valves?

Discussion in 'Irrigation / Sprinkler Forum' started by amartin725, Jul 18, 2005.

  1. dcj99b

    dcj99b New Member

    Oct 1, 2012
    Pontefract West Yorkshire UK
    Hi all you guys, I've really found this thread useful, helped me fix the problems out here in Mallorca at my friend's house.
    Two points I need to share.
    Water Pressure : I think those points are barking up the wrong tree. The valve is help shut by THE SPRING in the solenoid. The solenoid just pulls the spring.

    Back EMF (as we call it in UK) has not had a mention. On DC solenoids one would fit a diode and capacitor close to it solenoid.
    I'm not sure about AC solenoids, but there are voltage dependant resistors and even two 50V( say) zeners anode to anode across along with a .01uf capacitor should shift and spikes. The programmer should have that protection anyway, but that can be a significant distance away from the valve.
    Do keep this thread alive.
    Warmest regards, Derek
  2. PMcCool

    PMcCool New Member

    Oct 10, 2013
    Fort Worth, TX
    Okay I am going to help keep this thread alive. In 2006, I had an 11 valve system put in using WM valves and a Hunter C Pro controller. The last 7 years I have replaced selenoid after selenoid after selenoid. At the same time as that installation, I had two additional WM valves put on an existing 6 valve Rainbird system. I have never had any problems with the existing Rainbird vavles or the two new WM valves on the Rainbird system.

    I read this post from beginning until the end because I am troubleshooting and open valve. The common theme I saw was that the Hunter C Pro with WM valves had more problems than having a WM Controller or in my case a Rainbird controller.
    I was considering changing out each valve but perhaps the controller may be a better route. I do believe I need the updated selenoids as well though since I have been using the generic ones from Lowes. Thoughts anyone?
  3. Wet_Boots

    Wet_Boots Sprinkler Guy

    Mar 23, 2007
    Metro NYC
    the WM valves aren't an issue at present - the bad M24E solenoids have all died and been replaced by the new round solenoids, and the valves keep on working
  4. tbird355

    tbird355 New Member

    Aug 28, 2006
    I can help make this thread last another year. We have 12 Weathermatic valves in our vineyard and 36 in our landscape irrigation that were installed in 1985. The landscape units are all still going strong with their original M24E solenoids. Some of the 12 vineyard units were starting to get weak in April of this year and wouldn't always activate the station and so we replaced all of them recently with the new S20P. Obviously our experience has been the opposite of the others on this thread. We swear by Weathermatic valves. 29 years is pretty good. The others avlves, Hunter, Toro, etc. are so mickey mouse in how to run them manually. However we do use Hunter PGP heads in the lawns which also have been bullet proof, if the lawn mower blade keeps it's distance:) All our controllers are Irritrol, the old MC-12s, and those 29 year old rascals are still going strong too. Tom
  5. HeartFixr

    HeartFixr New Member

    Jun 11, 2016
    North Carolina
    Great website for very obscure information for us DIY.
    I also had to replace multiple solenoids for no apparent reason and also replaced 3 controllers blown up by lightning strikes. That problem was fixed by using a controller that has provision for direct ground.
    My Weathermatic solenoids failed as did Toro. I just measured a batch of new, unused Weathermatic S20P solenoids and all four had steady resistance at 36 ohms (36.0, 36.2, 36.2 and 36.1) . A Weathermatic S20P solenoid that was a problem had a resistance of 67 ohms and was fluctuating.
    Older series of WM solenoids M24E had resistance of 35.2 and 35.0 ohms.
    Fluke 73 multimeter
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