Abstract: A device for separating oil from water comprising a vessel in which the fluid to be separated is injected under pressure at a very high rate and directed against an improved type of deflector arrangement whereby the deflector plate substantially reverses fluid flow, directing it into a collecting collar which again reverses its flow causing interaction of the fluid upon itself to initiate separation of the less dense oil from the water, whereupon the oil is allowed to rise within the vessel and the water is drawn off at the bottom thereof. The fluid inside the vessel is maintained under a positive pressure and the rate of withdrawal of oil and water is separately controlled so as to maintain the pressure and to maintain a constant separation rate at the oil-water interface.