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 4140-01-441-2339
NSN 6650-01-433-5949
NSN 5935-00-899-2908
NSN 5950-01-261-7938
NSN 6685-01-450-4224
NSN 6130-01-562-7939
NSN 6105-01-566-1293
NSN 6150-01-241-3725
NSN 5945-00-564-3886
NSN 5920-01-275-7260
NSN 5935-00-537-0149
NSN 2925-00-925-0545