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Sprinkler system valves must be inspected to verify normal water supply pressure, that there is no physical damage, and that there is no leakage from the valve or trim piping. The extent of the inspection and the frequency depend on the type of sprinkler valve.
Keep in mind that if testing and inspections indicate potential problems of any sort, the frequency may need to be increased to prevent failure of the component.Alarm Check and Riser Check Valves Dry-Pipe Valves Deluge/Preaction Valves
A word about frequencies...
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