High Temperature
5 in-depth engineering guides on High Temperature — specification, selection, testing and procurement.
Everything on High Temperature
Vajra's engineering team has published 5 technical guides covering High Temperature for industrial valve selection, specification, testing and procurement. Browse the full set below.
High-Temperature Valve Selection Guide - Above 300°C to 600°C
Selecting valves above 300°C requires Cr-Mo alloy steel bodies, Stellite trim, graphite packing, and verification against API 941 Nelson curves - this guide explains every decision point.
Valves for Supercritical and Ultra-Supercritical Steam Power Plants
Supercritical and ultra-supercritical steam plants operating at 565–600°C require P91/P92 Cr-Mo-V alloy gate and globe valves with pressure-seal bonnets and Stellite hard-faced trim.
High-Temperature Valve Selection Guide - Above 300°C to 650°C
Carbon steel (WCB) is limited to 425°C. Above this temperature, the correct alloy steel grade selection - WC6, WC9, F22, or P91 - is critical for valve integrity in refinery and power plant service.
Metal-Seated Ball Valves for High-Temperature and Abrasive Service
Soft-seat (PTFE/RPTFE) ball valves have an upper temperature limit of 180-200°C continuous service. Above this temperature, or in fire-safe critical applications, metal-seated ball valves are required. Metal seats achieve API 598 Class V and Class VI shutoff through precision lapping of hard metallic seating surfaces, not through elastomeric deformation.
Valve Selection for Power Plants: Steam, Feedwater & Turbine Service
Thermal power plants operate at steam temperatures up to 620°C and pressures exceeding 250 bar. Valve failures in steam service are catastrophic - this guide covers IBR compliance, high-temperature alloy steels, steam trap selection, and turbine bypass specifications for coal, gas, and combined-cycle power stations.
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