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 copper having a pressure rating of 850 kpa or over
NSN 6240-00-309-7767
NSN 6650-00-182-7791
NSN 6610-01-445-1036
NSN 5945-01-534-3664
NSN 6620-01-415-2307
NSN 6220-01-634-0660
NSN 5855-01-085-5354
NSN 7035-01-027-3510
NSN 6650-00-458-7586
NSN 6685-01-010-2663
NSN 6135-01-312-1040
NSN 7035-00-834-2090