Thd series designator is non-std
A valve permitting flow in one direction only. It does not have a stem, except when equipped with a lever and weight and has no pressure adjustment. It may be inline or cartridge (manifold) design.
Classification: Check valves of steel
NSN 6320-01-659-2819
NSN 2925-00-660-8131
NSN 6685-00-183-0725
NSN 6650-01-495-3744
NSN 5915-00-633-1217
NSN 5990-01-411-5930
NSN 6685-01-055-0919
NSN 5930-01-579-3732
NSN 4140-01-513-7636
NSN 6130-00-758-1167
NSN 2925-00-243-6841
NSN 6130-01-563-9834