I do it by visual inspection. I had a service call on a solenoid that flooded a basement
Found a piece of plastic stuck in the valve.
Again, to make it perfectly clear, water valves will FLOOD if the pressure to it gets to low. The valve internal diaphram depends on water pressure to seal properly!!!
I just know from experience what pressure is normal. Typically, the water should really spray out hard when you loosten a fitting, a fast dribble is no good. |