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 5925-00-563-0831
NSN 5915-01-038-7811
NSN 5935-00-281-1237
NSN 7035-01-279-2815
NSN 6320-00-731-6134
NSN 6240-01-460-0331
NSN 6110-01-339-2031
NSN 5945-00-081-8622
NSN 5855-01-122-9418
NSN 5999-01-308-1424
NSN 6105-01-225-8000
NSN 6135-01-587-6485