Good Afternoon Friend,
I understand you want to know what the ball valve is for, in your Frigidaire dishwasher, model# FDB1050RE. In your particular appliance, I don't show that there should be a ball valve. I show that there is a "check ball" in the sump, which controls and switches water flow between the spray arms. I ask that you please follow up with a comment on the post, at your convenience, to advise if you have further questions. Hope this is helpful.
-Best regards-
WP
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