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 2925-01-570-3696
NSN 5960-01-632-6576
NSN 6130-01-196-4110
NSN 6220-01-176-9139
NSN 5965-00-529-0602
NSN 5999-00-266-3805
NSN 5930-01-276-2384
NSN 5996-00-454-7938
NSN 6645-00-829-8868
NSN 2925-00-233-5644
NSN 6220-00-971-8332
NSN 5985-00-205-8853