A valve with a stem that may be mechanically actuated to three different positions by rotary or linear motion. In the first position, the valve disk is located and locked against the seat permitting no fluid flow through the valve. In the second position, one side of the valve disk is located against the seat permitting movement of the disk in a manner that will allow a flow of fluid in one direction through the valve. In the third position, the valve disk is lifted from the seat to allow a flow of fluid in either direction through the valve. The valve disk may be spring loaded. See also valve, lift-check and valve, stop-check.
Classification: Check valves of steel
NSN 5996-01-382-2114
NSN 5895-01-125-9629
NSN 2925-00-623-3103
NSN 7035-01-352-6235
NSN 5998-01-373-7299
NSN 6685-01-120-8293
NSN 6110-00-623-5328
NSN 5985-01-440-8981
NSN 5999-01-446-7248
NSN 5990-01-458-6789
NSN 5835-01-034-5206
NSN 5990-01-526-9941