A device designed for installation in the main riser of a dry or empty pipe automatic sprinkler system and held closed by spring force, air, or water pressure. Water is automatically released to the sprinkler system either by releasing or lowering the pressure beyond the minimum requirement or admitting and increasing the pressure to overcome the spring force.
Classification: Parts, nesoi, of mechanical appliances for projecting, dispersing or spraying liquids or powders; of fire extinguishers; of spray guns
NSN 6130-00-193-2421
NSN 5855-01-634-0259
NSN 6220-01-230-4372
NSN 5905-01-336-6641
NSN 5925-01-049-6593
NSN 6320-00-149-7570
NSN 5915-00-771-8808
NSN 5895-00-111-1560
NSN 6150-01-214-5871
NSN 5990-00-578-8850
NSN 6105-01-379-1825
NSN 5985-01-057-2746