Forged Steel Flanged Gate Valve: Structure and Materials

Forged steel gate valves feature three bonnet designs: the first is the bolted bonnet, where the body and bonnet are connected by bolts and nuts with a spiral-wound gasket seal; the second is the welded bonnet, where the body and bonnet are threaded and fully seal-welded; the third is the pressure-seal bonnet, where the body and bonnet are threaded and sealed by an internal pressure-actuated self-sealing ring.
Structural characteristics of forged steel gate valves include full-port or reduced-port options, an OS&Y (Outside Screw and Yoke) design, and a self-aligning gland/packing follower structure; they feature an integral back-seat, and threaded ends (NPT) comply with the ANSI/ASME B1.20.1 standard.
Design and manufacturing comply with standards such as API 602, BS 5352, and ASME B16.34; inspection and testing are conducted in accordance with API 598; and marking follows MSS-SP-25.
Materials for major components-such as the body, seat, wedge, stem, gasket, bonnet, and bolts-are selected based on specific requirements (e.g., carbon steel A105, alloy steel F22, stainless steel F304(L)/F316(L)) and correspond to standards such as ASTM A105, A182 F304, and A276 304.