How pool pump valves should be set

How a Jandy 3-Way Valve Works

the Jandy 3-Way valve is one of the most confusing valves on swimming pool equipment. The reason it is confusing is you can't see the stopper inside the valve so the only way to know where the valve is sending water (if your pipes weren't labeled) is to turn the handle and then go to your pool to see where water is coming out. And when you turn it to the center, the position that people mistake for "OFF" water comes out both places!


The picture shows the normal operational position for the suction valve. With the handle place halfway between the left and right port, water is allowed to flow freely from both ports through the inlet port to the pool pump.

http://www.inyopools.com/HowToPage/how_to_install_a_diverter_valve_on_the_suction_side_of_a_pool.aspx

http://www.inyopools.com/HowToPage/how-to-set-up-pool-diverter-valves-for-a-basic-system-suction-port.aspx