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.
NSN 4140-01-139-0141
NSN 6610-01-336-2787
NSN 6620-01-329-0845
NSN 6110-00-200-8465
NSN 5950-01-545-1905
NSN 5920-01-114-3507
NSN 6150-01-608-8990
NSN 5960-01-491-2993
NSN 6110-00-242-0463
NSN 5925-01-134-2747
NSN 5950-01-570-8677
NSN 5905-01-265-5784