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 5950-01-425-0797
NSN 6645-00-173-2800
NSN 5855-01-594-7809
NSN 5915-01-403-2599
NSN 6645-01-580-9570
NSN 6110-01-628-0530
NSN 5835-01-107-8600
NSN 5975-00-386-5006
NSN 5945-01-291-5511
NSN 6105-00-561-7169
NSN 6650-01-120-6231
NSN 7035-01-110-5745