General Design & Performance: Parameter Description Applicable Valve Types Primarily for Globe Valves (e.g., Fisher GX, HP, etc.) and some Rotary Valves. Trim Types • Hardened Multi-Stage Trim: For cavitation and noise control in erosive services. • Solid Carbide Trim: For extremely abrasive slurries (e.g., mining). • Large Open Port Cage: For slurries and solids-bearing fluids. • Thick-Seated Trim: With hardened inserts for tight shut-off in erosive flow. Leakage Class Typically ANSI FCI 70-2 Class IV (standard metal seat). Class V or better is achievable with special lapping or elastomeric seals, but may sacrifice some abrasion resistance. Flow Characteristic Modified Equal Percentage or Linear (designed to maintain characteristic despite wear). Materials of Construction (Typical): Component Standard Material Dirty Service Material Options Plug 17-4PH SST 440C SST, Stellite 6B overlay, Solid Tungsten Carbide Cage 316 SST, 17-4PH SST 440C SST, 316 SST with Stellite overlay, Solid Tungsten Carbide Seat Ring 316 SST 17-4PH SST, 440C SST, Stellite hardened Valve Body Carbon Steel (WCB), 316 SST Often lined with abrasion-resistant materials (e.g., Ceramic) for severe service. Typical Applications: Mining & Minerals: Tailings, concentrate slurries, hydro-transport. Coal Slurry Pipelines Wastewater Treatment: Sludge control, grit removal. Pulp & Paper: Stock, black liquor. Chemical Processing: Catalyst beds, polymer slurries, abrasive salts. Power Generation: Fly ash, bottom ash slurry, FGD slurry (the primary application for many designs). Oil & Gas: Produced water, wellhead choke valves.
