Parameter Description Applicable Valve Types Fisher Globe Valves (e.g., ED, ES, HP, and others) Trim Type Multi-stage, drilled-hole stacked plate trim. Primary Function Cavitation Control & Erosion Reduction. Flow Characteristic Linear (inherent to the multi-stage design). Shut-Off Class Dependent on the specific plug and seat arrangement of the main valve. Typically ANSI Class IV or better with metal seats. Liquid Pressure Recovery Factor (F_L) Very high (approaches 1.0), indicating excellent resistance to cavitation. Materials of Construction (Typical): Cage/Trim Stack: 316 Stainless Steel (standard), 17-4PH Stainless Steel, or other hardened alloys. Plug: 17-4PH SST, Stellite-faced, or Tungsten Carbide for extreme service. Seat Ring: 316 SST, Stellite-faced. Typical Applications: Micro-Flat trim is specified for severe liquid services where cavitation is a known problem, such as: Boiler Feedwater Pump Recirculation (BFP Recirc) High-Pressure Letdown Services Condensate Recirculation Water Injection Wellhead Choke Valves Chemical Plant Pressure Letdown Any application with a high ΔP where the outlet pressure remains above the liquid's vapor pressure.