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 5835-00-264-0946
NSN 5925-01-421-4473
NSN 5960-01-431-4291
NSN 5910-00-170-9116
NSN 5835-00-170-5238
NSN 6320-01-631-7828
NSN 5910-01-246-3381
NSN 4140-01-419-5976
NSN 5925-01-441-9569
NSN 5905-01-033-6581
NSN 5975-01-574-7669
NSN 6150-01-546-5107