There is a flat-face flange on the valve
A deformable material which prevents the passage of matter through the joint formed when two faces are joined. It may be metallic or nonmetallic, lubricated or impregnated, solid or hollow cross section. It may be made to any predetermined dimension and shape. Excludes flat disks, items made of felt material and items having joints. For round metal and plastic items with an aperture and a solid rectangular cross section, see washer, flat; shim; bearing, washer, thrust; and spacer ring. Excludes disk, valve; seal, nonmetallic angle; seal, nonmetallic channel; seal, nonmetallic special shaped section; shielding gasket, electronic; and ring, sealing jar.
NSN 5835-00-128-8762
NSN 5905-01-540-7442
NSN 2925-01-206-7948
NSN 5855-00-337-3679
NSN 6620-00-827-1611
NSN 6320-01-422-1212
NSN 6620-01-588-2319
NSN 6240-00-146-9322
NSN 6645-01-442-6476
NSN 6240-01-012-2706
NSN 5935-00-342-9426
NSN 6645-00-406-8114