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EDCO USA classic vacuum pumps are our most popular multi-stage pump. Larger capacity pumps are created by placing identical nozzle sets in a parallel configuration. This can be done in the same body or by using an additional module stack. Additional vacuum flow capacity is attained by maximum vacuum level is not affected since the nozzle series is the determining factor. This method provides a specific, repeatable increment of capacity increase that is very handy when sizing a pump since the basic shape of the performance curve doesn’t change. Vacuum flow and air consumption is increased in proportion to the number of nozzle sets while system evacuation time is decreased proportionately.
  • Multi-Ejector
  • High-Flow Mode
  • High-Vacuum Mode
  • Stainless Steel Valve Plate
  • Eight Available Capacities
  • Six Available Ejector Series
  • STC34M Silencer Included
  • Optional Switches / Sensors
Also Available
  • Mini-Classic Vacuum Pumps
  • Dual-Base Classic Vaccum Pumps
  • Triple Base Classic Vacuum Pumps
  • Quadruple Base Classic Vacuum Pumps

High-Flow Mode

An air supply to the pump is turned on and high-pressure air flows through the first nozzle which generates a vacuum flow when it passes into the second nozzle. As air is evacuated from the system, induced air flows into the first stage ejector (gap between the first and second nozzles) and combines with the compressed air flow from the first nozzle before passing into the second stage ejector (gap between the second and third nozzles). The powerful combined air flow induces a high vacuum flow rate through the second stage ejector until the increasing vacuum level causes the flap check valve to close. The valve closing point is dependent on nozzle series and operating pressure. For example: at 87 psi, the flap valve will close at 11 inHg for an ML series classic vacuum pump and at 18 inHg for an E series classic pump. This closing is evident by the change in slop of the performance curve.

High-Vacuum Mode

After the flap valve closes, induced air continues to be drawn into the first stage ejector and the vacuum level will increase to the maximum level allowed by the nozzle series. At this point, the second stage is isolated and is not contributing to system evacuation. Some of our competitors offer three and four stage vacuum pumps but these provide very little benefit for industrial systems since a third stage will shut down at 3 inHg and a fourth stage will shut down at 1.5 inHg. EDCO USA classic vacuum pump nozzles are optimized to give extra vacuum flow at higher vacuum levels to compensate for lower flows from zero to 3 inHg. Our evacuation times to 12 inHg will be equal to or better than the competition.

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