I recently purchased a home and am trying to repair an irrigation system. There is a manifold with four Lawn Genie R706 valves with Valve Adapters 756LG. The location of the valves is 2 to 3 feet below the level of the highest sprinkler head and the valves are leaking and/or won't shut off. I can't find any literature about these valves so I assume they are pretty old.

Are these valves appropriately installed below the level of the highest sprinkler head ?

Thanks for your help.