The efficiency of a Microfluidizer to a high pressure valve homogeniser (HPH) for the production of oil continuous emulsions by investigating the effect of pressure, number of passes, phase viscosities and salt addition on droplet size. The results obtained show that the Microfluidizer and HPH have similar emulsification efficiency, giving droplets of 60 nm diameter at a pressure of 50 MPa. By increasing the pressure to 100 MPa the droplet diameter was reduced by 10 nm in both devices.