We have a sprinkler system with Irritrol 2700 series antisiphon valves. Recently I started noticing dripping from the body of 2 of the valves on the outflow side. I don't know if it is related but I've had the water supplying the system turned off except on days I want to water because another big leak developed at the connection to another valve that I have since repaired. I

ve only noticed the drips since trying to keep the water on all the time. I could probably explain this better but I don't know what all the parts are called. Could it be related to the fact that I didn't have any water pressure on the inflow side for awhile? I've read that debris or a tear can cause a leak, but would it cause a leak outside the valve?