Forged steel trunnion mounted ball valves with thrust plate construction are selected for full-bore isolation service in large-bore, high-pressure pipeline applications where the structural integrity of forged body construction is required at Class 600 and above, and where precise ball positioning under high axial pressure loads must be maintained throughout the valve’s service life. The thrust plate provides axial load bearing support that standard trunnion designs do not incorporate — distributing high pipeline pressure loads across the thrust plate bearing surface and preventing the ball displacement and trunnion deflection that could compromise seat sealing performance at large bore sizes under sustained Class 600 differential pressure.

Multi-segment forged body construction extends the size range of forged steel ball valves beyond the practical limits of single-piece forgings — allowing the material quality, homogeneity, and mechanical consistency of A105 and alloy steel forgings to be applied to large-bore pipeline valve service where cast body alternatives would otherwise be required. This is particularly advantageous for Class 600 and above service where forged body construction is specified for critical pipeline isolation duty in oil & gas processing, petrochemical plants, and high-pressure transmission pipelines.

Body material selection follows standard pipeline ball valve criteria — A105 for standard high-pressure service up to 425°C, alloy steel (F11, F22) for high-temperature applications up to 600°C, and stainless steel (F304, F316) or duplex grades for corrosive and sour service environments. Gear operators are standard for large-bore high-pressure service, with electric, pneumatic, and hydraulic actuators selected for automated control, ESD duty, and remote operation. Design standard API 6D governs forged steel trunnion mounted ball valves for pipeline service across all bore sizes and pressure classes