How do you size control valves for non-Newtonian fluids and slurries?

Non-Newtonian and slurry valve sizing challenges: viscosity varies with shear rate (pseudoplastic, dilatant), particle settling affects flow regime, and two-phase behavior complicates capacity calculations. Approach: determine apparent viscosity at expected shear rate, apply viscosity correction factor to Cv (Fv per ISA), consider solids concentration effect on effective SG, select straight-through flow path (V-ball, eccentric plug) to minimize clogging, oversize by 20-30% for margin, and verify velocity limits (typically 8-15 fps to prevent erosion while maintaining suspension). Special materials and hard-facing for erosion resistance. Test with actual process fluid when possible.