F-V-2906, FEDERAL SPECIFICATION: VALVES, AIR VENTING, STEAM (12-JUNE-1997) [SUPERSEDING MIL-V-18499]

F-V-2906, FEDERAL SPECIFICATION: VALVES, AIR VENTING, STEAM (12-JUNE-1997) [SUPERSEDING MIL-V-18499]., This specification covers valves for automatically venting air from mains in steam heating systems.