This International Standard specifies the requirements for a heavy-duty series of bolted bonnet steel gate valves for petroleum refinery and related applications where corrosion, erosion and other service conditions would indicate a need for full port openings, heavy wall sections and large stem diameters.
This International Standard sets forth the requirements for the following gate valve features:
-- bolted bonnet;
-- outside screw and yoke;
-- rising stems;
-- non-rising handwheels;
-- single or double gate;
-- wedge or parallel seating;
-- metallic seating surfaces;
-- flanged or butt-welding ends.
It covers valves of the nominal sizes DN:
-- 25; 32; 40; 50; 65; 80; 100; 150; 200; 250; 300; 350; 400; 450; 500; 600;
corresponding to nominal pipe sizes NPS:
-- 1; 11/4; 11/2; 2; 21/2; 3; 4; 6; 8; 10; 12; 14; 16; 18; 20; 24;
and applies for pressure Class designations:
-- 150; 300; 600; 900; 1500; 2500.