EN ISO 10434:2020

This document 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 can indicate a need for full port openings, heavy wall sections and large stem diameters.This document 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; 1¼; 1½; 2; 2½; 3; 4; 6; 8; 10; 12; 14; 16; 18; 20; 24;applies for pressure Class designations:— 150; 300; 600; 900; 1 500; 2 500;and applies for pressure PN designations:— 16, 25, 40, 63, 100, 160, 250 and 400.