Could a valve replacement cause other valves to break?

Discussion in 'Irrigation / Sprinkler Forum' started by Koru04, Jun 16, 2010.

  1. Koru04

    Koru04 New Member

    Jun 16, 2010
    New Mexico

    My irrigation system has five zones: 2 control the drip system and 3 control the sprinklers on the lawn. I recently had the valve replaced that controls the drip system. When the water was turned back on after the valve replacement, all 3 lawn sprinkler valves broke.

    Two of the three zones are randomly coming on for a few seconds at a time every 15 minutes or so. The other zone was 'turned off' but is leaking continually all over the lawn.

    Is it possible that the replacement of one valve put more water pressure on the other valves and blew them all? I'm having trouble believing this. Any thoughts?

  2. BRD

    BRD New Member

    Jun 22, 2009
    irrigation contractor
    Not sure what you meant when you said "all three lawn sprinkler valves broke". Changing a valve assembly should not have an affect on other valves within the system. The static pressure within the system would not change.Not sure whats going on there, need more info.
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    Replacing one valve has absolutely nothing to do with the others, and it does NOT change the pressure dynamics one bit. We are not sure what kind of valves you have, but normally the only way they can turn on is if the pressure above the diaphragm becomes less than what is below it, usually because of a leak. BUT, because of the way valves work, a small leak is ALWAYS being replenished so the valve cannot operate by itself. When it does operate, it will only be for as long as it takes for the valve to stabilize, which could be those few seconds. Your job, should you agree to accept it, is to find out WHY the valve is losing enough pressure to operate and why it then shuts off. Normally, if the leak was the kind that turns the valve on, it will CONTINUE leaking and not shut off, and anything less would not turn it on in the first place. You may have an electrical problem, unless your valves work hydraulically using water pressure.
  5. Even Flow

    Even Flow New Member

    Jun 23, 2010
    Crown Point, IN.
    One very likely possibility: When you replaced a valve dirt and or small pebbles got into the valve assembly/manifold and is wreaking havoc on the valves. Turn off the valve on the PVB and open up the other valves and flush them out. At most you may need new diaphragms.
  6. Fireguy97

    Fireguy97 Irrigation Contractor

    Mar 21, 2010
    Irrigation Contractor / Certified Backflow Assembl
    Kamloops, in Beautiful British Col
    I'm with Even Flow for the possible fix. What the others have said is connect. The short answer to your question is no. I think that some dirt or debris got into your other diaphrams and are cousing your other valves to 'seep' or flow slowly while thay are supposed to be off. Clean you diaphrams. If that doesn't work, your might have to replace your diaphrams.

  7. tomm

    tomm New Member

    Feb 21, 2008
    you hired a hack. Any decent company would have inspected the entire system upon completion.
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