Some applications require that very deep vacuum levels are obtained with ejectors. Steam jet ejectors are often used when very deep vacuum levels are required (below 0.5 psia or 20 Torr.) Steam ejectors are ideal for this application.
Air ejectors can also be staged to pull progressively deeper vacuum levels.
The maximum vacuum that can be created by a single ejector is ~2 psia (138 mbara.)
A two-stage system can achieve vacuum levels below 0.5 psia (35 mbara.)
Wind Tunnels and High Altitude Simulation
Fox air jet ejectors have been used since the 1980’s to create the deep vacuum to simulate high altitude in many applications. See attached photo of the Fox two stage ejector atop the hypersonic wind tunnel at Princeton Univ. Other ejectors have been installed directly on the outlet of engines during testing – to simulate exhaust at 2 or 3 psia
Air Jet Boosters for use with Liquid Ring Vacuum Pumps
Liquid ring vacuum pumps (LRVP) are used throughout industry to provide moderate vacuum levels for a variety of industrial tasks. The level of vacuum they can pull is limited by the temperature of the sealing liquid. With at atmospheric air-powered ejector, the user can bypass this limitation and achieve much deep vacuum levels. LRVP’s that previously could only pull down to 40 – 50 Torr of vacuum can reach 5 – 10 Torr with no additional power requirement.
Suction Cups – Industrial Hold-Down
These applications typically involve low suction flow rates, which are best handled using our Mini-Eductors. Please visit the Mini-Eductor section of our website for more information.
De-Aeration of Hydraulic Oil, Vegetable Oil
When Fox ejectors create a deep vacuum in the headspace of a tank filled with oil, depending on oil temperature, the air will come out of solution. For degassing applications in the food industry – Fox fully sanitary ejectors can be provided.
