The potter vsr series is the industry standard for flow switches for fire sprinkler systems and is compatible with the widest range of pipe schedules 5 through 40 in the industry as well as all necessary listings and approvals for installation worldwide. The flow condition must exist for a period of time necessary to overcome the selected retard period. It is ul the switches are actuated when a flow of 10 gpm 38 lpm or more occurs.
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