Separate Shut Off Valve for Pool to Main Inlet

Welcome to TFP.
Members that close their pool in winter may have a shut off on the suction side because it helps them lock in air in the pipes.
It is not a requirement if you do not close your pool which is unlikely in AZ.
If I misunderstood your question - provide a photo to help clarify what valve you are referring to. Thanks.
 
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