1 type is normally closed
A valve that controls flow by a circular disk, or a pair of semicircular disks, attached to a common spindle or lever turning on a diametral axis.
NSN 6220-01-020-6179
NSN 5998-00-615-9251
NSN 5905-00-129-6554
NSN 5975-01-401-5355
NSN 5960-01-170-4057
NSN 6320-01-441-2438
NSN 6105-01-289-1082
NSN 7035-01-477-9028
NSN 5835-01-469-6009
NSN 7035-01-632-8861
NSN 5935-00-920-4284
NSN 5925-01-445-0850