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 5920-01-418-1821
NSN 6240-00-079-1759
NSN 6135-01-128-5358
NSN 6610-01-416-8384
NSN 5996-01-158-5197
NSN 6610-01-388-8313
NSN 6220-00-959-5970
NSN 6220-01-546-0916
NSN 6610-01-524-0636
NSN 5930-01-068-3641
NSN 5996-01-469-3140
NSN 5996-00-763-0139