In this study, experimental equipment was designed and manufactured to realize flash boiling spray in scramjets, gas turbines, liquid rockets, and internal combustion engines. The injection pressure and temperature could reach up to 5 bar and 160 °C, respectively, and the chamber pressure could be lowered to 0.03 bar. The heating capacity of the additional heater attached to the injector body was determined to be 330 W by considering heat transfer. The simple orifice nozzle (D: 0.5 mm, L: 4 mm, L/D: 8) was used and 9 cartridge heaters with a 300 W heating capacity were installed inside the chamber wall based on an ANSYS analysis to heat the vacuum chamber wall. Four visible windows (3 of 50 mm × 160 mm, 1 of 110 mm × 160 mm) were installed in the vacuum chamber to see inside the chamber. To obtain the flow discharge coefficient, a pressure sensor, and a volumetric flowmeter were used. By using this equipment, the spray shape and flow discharge coefficient was obtained at various injection pressures, temperatures, and atmospheric pressures. The preliminary result from the equipment is also shown.