Diesel Urea Injector Parameter Calculator Diesel Urea Injector Parameter Calculator Structural Parameter Calculation Injection Performance Calculation Electromagnetic Characteristic Calculation Single Injection Volume Q (mm³) Initial Injection Velocity v (m/s) Injection Duration t (ms) Needle Valve Cavity Volume V_cav (mm³) Needle Valve Cross-sectional Area A_valve (mm²) Calculate Structural Parameters Flow Coefficient K Duty Cycle D (%) Injection Frequency f (Hz) Injection Pressure P (MPa) Calculate Injection Performance Magnetic Flux Density B (T) Armature Effective Area S (m²) Spring Preload Force F_spring (N) Armature Mass m (kg) Calculate Electromagnetic Characteristics