scope:

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 pipe sizes NPS:

- 1; 1 ¼; 1 ½; 2; 2 ½; 3; 4; 6; 8; 10; 12; 14; 16; 18; 20; 24,

corresponding to nominal pipe sizes DN:

- 25; 32; 40; 50; 65; 80; 100; 150; 200; 250; 300; 350; 400; 450; 500; 600,

applies for pressure class designations:

- 150; 300; 600; 900; 1500; 2500.