I have four pipes each with a Jandy Neverlube valve coming into the suction side of my pump (spa, main drain, and 2 skimmers). While the pump is running, if I close off one or two of the suction side valves (thereby increasing the vacuum pressure), I get a burst of bubbles in my pump basket. Is this normal or does it indicate that I have a minor leak on the suction side somewhere?
I just want to get your thoughts before I start re-taping threads and pulling apart valves. I already checked and lubed the gaskets on the pump lid and drain plugs. I did notice that my 2-port Jandy Neverlube valves appear to be installed backwards. One port says "IN", but that port on the pump side of the valve. Could that contribute to the bubbles? It appears that I can just remove the six screws on top of the valve and turn it around.
Thanks for your help!