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:
corresponding to nominal pipe sizes NPS:
and applies for pressure Class designations: