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 5925-01-070-8369
NSN 5990-01-378-7349
NSN 5915-00-419-5334
NSN 4140-00-571-5337
NSN 5905-01-297-5884
NSN 5998-00-112-4228
NSN 6135-01-415-4124
NSN 6685-00-419-0643
NSN 6645-01-023-8020
NSN 5975-01-631-8519
NSN 5985-01-587-1317
NSN 5925-01-025-7008