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 4140-00-079-8453
NSN 6610-01-503-0153
NSN 6650-01-255-0423
NSN 6685-01-531-3339
NSN 5960-00-204-7506
NSN 6110-00-795-3706
NSN 5985-00-003-7416
NSN 5999-00-882-0158
NSN 5998-01-067-6759
NSN 5990-00-827-0684
NSN 6610-01-515-9712
NSN 5985-01-432-1715