Fire Protection · F-4FQ5K

Dry Valve Schematic Detail

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The dry pipe valve assembly connects the main water supply line to the sprinkler system using an OS&Y gate valve with a tamper switch, a supply line check valve, and the main dry pipe valve. The air supply system features nitrogen from a nitrogen generator or an air compressor passing through a restriction orifice, condensate chamber, and an air maintenance device with a pressure relief valve and check valve. Pressure gauges in three-way valves monitor system and supply pressures, while low air pressure and water flow pressure alarm switches connect to the building fire alarm. Additional components include an alarm control valve, alarm test valve, alarm water connection, vent fitting, automatic drain valve, main drain valve with exterior drain, priming water supply valve, and a priming cup.

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