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 6220-01-197-0486
NSN 6610-01-479-0466
NSN 6110-01-629-9118
NSN 6150-01-020-6596
NSN 5998-01-642-1216
NSN 5975-01-558-1008
NSN 6320-01-278-9832
NSN 6240-01-100-1279
NSN 6610-01-179-0116
NSN 5855-00-586-6255
NSN 5950-01-518-2569
NSN 6320-01-265-0665