Specifications include, but are not limited to: Plug Valve shall be of rectangular port construction. Plugs shall be solid one piece, Cast Iron ASTM A126 Class. The plug shall have a cylindrical seating surface eccentrically offset from the center of the shaft. Plug shall not contact the seat until at least 90% closed. Resilient plug facing shall be Chloroprene (CR). Sphericalshaped plugs are not acceptable. Bodies and covers shall be Cast Iron ASTM A126 Class B. Ports shall be rectangular. Round ports are not acceptable. Bearings shall be sleeve type and made of sintered, oil impregnated permanently lubricated type 316 stainless steel for sizes 4-18” (100-450mm) and ASTM A743 Grade CF8M for sizes 20-36” (500-800mm). Seats on shall be 1/8” thick welded overlay of not less than 95% pure nickel. Seat shall be at least 1/2” wide, 1/8” thick through entire width and raised. The raised surface shall be completely coveredwith nickel to insure that the resilient plug face contacts only the nickel seat. Adjustable packing shall be Acrylonitrile-Butadiene (NBR) multiple V-ring type, with a packing gland follower. Packing gland shall permit inspection, adjustment or complete replacement of packing without disturbing any part of the valve or actuator assembly, except the gland follower. Non- adjustable packing or packing requiring actuator removal to replace the packing, is not acceptable. Shims for packing adjustment shall not be used
