1 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:
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— bolted bonnet;
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— outside screw and yoke;
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— rising stems;
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— non-rising handwheels;
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— single or double gate;
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— wedge or parallel seating;
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— metallic seating surfaces;
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— flanged or butt-welding ends.
It covers valves of the nominal sizes DN:
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— 25; 32; 40; 50; 65; 80; 100; 150; 200; 250; 300; 350; 400; 450; 500; 600;
corresponding to nominal pipe sizes NPS:
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— 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:
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— 150; 300; 600; 900; 1500; 2500.