Fox Air and Gas Jet Ejectors for Pumping Gas or Creating Vacuum

Suck away, vent, or remove gas using Fox air-operated vacuum jet ejectors driven with compressed air, N2, or any gas. Vapors to be removed can be hot, explosive, dusty, or corrosive. Fox stock ejectors vent gasses with no moving parts for 24/7 reliability. Stock ejectors in 316SS and PVC, 1/2″ to 4″ can ship in 1-2 weeks. To confirm that a stock ejector can work in your application, please use the Request a Quote button below or call us.

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Fox ejectors can create vacuum to 2 psia, using air, N2, steam, or any gas. Venturi jet ejectors have no moving parts and their simplicity allows for maintenance-free use with nasty, corrosive, dusty, or high-temp gases. A Fox jet can eliminate the need for blowers and fans and their shafts, seals, etc.

Fox Air Gas Jet Ejector

Evacuating, exhausting, or venting vapors from vessels, tanks, railcars, or refining processes can be accomplished with simple, no-moving-parts venturi jet ejectors.

Fox Air Jet Ejector for Tank Venting
Fox Air and Gas Ejectors are frequently used as exhausters to vent gases from a tank or vessel.

Typical Applications

  • Evacuating pipelines, vessels and tubing of explosive or toxic fumes before maintenance
  • Exhausting air at 700° F containing cement kiln dust from cement kilns
  • Pump Priming
  • Creating vacuum in evaporators, crystalizers, deodorizers and other chemical and food processing applications
  • Venting methane and sewer gasses from landfills, WTP’s, natural gas processing
  • Blending gasses in precise mixture ratios (Argon + chlorine in a recent application)
  • Evacuating Sulfur fumes (H2S) from sulfur pits, trucks and tanks with steam jacketed ejectors, maintaining internal gas temps above 280° F to prevent solidification
  • Venting Engine exhaust, fumes, and CO2, etc – including creating deep vacuum on jet and rocket engines for high altitude simulation
  • Exhausting explosive or radioactive gasses
  • Blowdown: Pass gasses through venturi ejector from a vessel or pipeline at up to 5000 psig during initial purging, then venturi ejector completes evacuation down to 1 to 2 psia
  • Blending gasses (optional with Fox sonic choke on suction) to blend to precise mixture ratio
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What do we mean by “off-the-shelf” gas ejectors?

Fox Inventory

Fox maintains a large inventory of assembled and un-assembled 1/4″ to 8″ Fox venturi ejectors in carbon steel and stainless, manufactured in Dover, NJ, USA. This large inventory of un-assembled ejector components enables Fox to quickly make modifications to ejector internals to suit application requirements—and still often ship in 2 days to 2 weeks. This includes re-machining motive nozzle orifice to define required motive gas consumption, welding nozzle in place if required, and welding on flanges or other end connections or adapters—all in our building.

Gas Sampling for Analyzers and Instrumentation with Mini-Eductors

Fox Mini-Eductor

Fox Air-Driven Mini-Eductors have been installed on thousands of analyzer systems for gas sampling since the 1960’s. Please visit the Mini-Eductor section of our website for more information.


Schematics of Typical Applications

Pump Priming with Air Jet Ejectors

Pump Priming Ejector
A Fox Air Ejector pulls a vacuum on a pump housing to evacuate the suction line and draw water up into the pump.
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Venting Methane and Natural Gas to Flare Header in Oil and Gas Applications

Global environmental organizations have identified methane – the primary constituent of natural gas – as a major contributor to global warming. Oil & gas wells, gas processing plants, and onshore and offshore drilling platforms and sites have been identified as possible sources of methane release via leaks and fugitive emissions. Fox venturi ejectors have been used since the 1980’s to capture released gas and return to process or a flare header or another destination.

For information about Fox Gas Ejectors used in the oil and gas industries, please visit our Natural Gas Ejectors page.

Ejector Flare Header Diagram

Purging or Evacuating Piplines or Tubing

Hydraulic Hoses and Pipeline
 

Creating Deep VacuumCreating Deep Vacuum to 1 psia with a Two-Stage Air Ejector

Two Stage Ejector System at Princeton University Wind Tunnel

Mechanical Properties of Available Fox Ejectors

  • Line Sizes: 1/4 to 42 inch diameter (6mm to ~1m)
  • Temps: -350° to 2000° F (to 1090° C)
  • Materials:
    • Metals: Stainless, Monel, Hastelloy, Titanium, Alloy 20, Aluminum, or Any Machinable Metal
    • Plastics: PVC, CPVC, Teflon-Lined, Kynar-Lined
  • Off-The-Shelf Carbon Steel or Stainless Gas Ejectors: 1/4″ to 8″
  • Off-The-Shelf Plastic/PVC Gas Ejectors: 1/2″ to 3″; CPVC 1/2″ to 2″
  • Custom built/Custom engineered Gas Ejectors: 1/4″ to 42″
  • MAWP available to 10,000 psig (700 barg)
  • End Connections:
    • Threads: NPT, BSP, SAE 45° Flare, AN 37° Flare
    • Flanges: 150# to 3000# ANSI, DIN Flanges, or any custom-built flange to mate to any equipment
    • Tubing: Stub ends of any specified tubing, inch or mm
    • Food-Grade: Tri-clamp or other sanitary/hygienic ferrules
    • Weld: Butt weld prep ends
  • Available Processes: Electropolish, oxygen cleaning, passivation, anodizing, etc.


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