Mk1, megastream, 1.50/2 inch. Valve. Hardness 37 hrc min. The manufacturer calls this item a seat ring.
A replaceable item designed to provide a stationary seating surface for a mating, moveable item such as a valve disk or the like. The body may have a flange of various shapes. For diesel and gasoline reciprocating engines, see insert, engine valve seat.
Classification: Parts of taps, cocks, valves and similar appliances, nesoi
NSN 5935-00-453-2599
NSN 6620-01-155-4014
NSN 4140-01-414-7093
NSN 5999-00-518-1007
NSN 5996-00-777-0173
NSN 5975-01-590-2768
NSN 6650-00-143-1889
NSN 5998-01-227-5651
NSN 6130-01-570-1535
NSN 6645-01-607-2132
NSN 5905-01-413-3602
NSN 6650-01-595-6102