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 6150-01-272-6927
NSN 5910-01-016-5528
NSN 6620-00-247-4474
NSN 6220-01-246-7534
NSN 6130-00-444-4871
NSN 5835-00-972-9983
NSN 6685-00-187-8379
NSN 5910-01-159-4118
NSN 6645-01-252-8870
NSN 5905-00-629-0449
NSN 5975-01-062-5189
NSN 6135-00-377-9165