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 5905-01-322-4901
NSN 5990-01-027-0568
NSN 6240-00-218-1480
NSN 6220-01-242-9901
NSN 5915-01-461-4310
NSN 5960-01-039-7840
NSN 5960-01-536-9763
NSN 5985-01-353-8696
NSN 6110-01-500-0768
NSN 6130-01-548-4901
NSN 5945-01-348-7146
NSN 6130-01-442-1834