This paper presents the results of numerical calculations of the hydraulic and cavitation characteristics of a ball valve, made to build a ROM model of valves for subsequent use of the ROM model as an FMU unit in the global system model of a water fire system of a ship. A study was carried out of the possibility for co-simulation of the Flownex system thermal-hydraulic code with the ANSYS CFX gas-dynamic solver. For the calculation of cavitation, the standard model Zwart et al was applied. The eddy -resolving turbulence model SBES with the subgrid model WALE was used. To assess the acoustic characteristics of the valves, the integral Fox Williams-Hawking method was used. The pressure pulsation spectra in the far acoustic field were calculated on the basis of the fast Fourier transform. The developed method of generating ROM-models of elements of hydraulic networks based on multifactor numerical calculations in ANSYS can be used in the construction of integrated digital models of ship systems.