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  • Classic Vacuum Pumps
A vacuum pump is any kind of pumping device that extracts air molecules from a volume to reduce internal pressure below atmospheric (barometric) pressure.  This sub-atmospheric pressure is commonly called a “vacuum” or “suction” and may be used with a rubber cup to pick up workpieces without marring their surfaces.
EDCO offers six different series of Classic pumps, each having different performance characteristics and optimum operating air pressures, and all are priced the same.  This allows the proper pump to be selected for a particular application without any concern for pump price.
Classic vacuum pumps from EDCO USA are available in standard configuration or compact Mini-Classic configuration that use the same six nozzle series to provide equal performance.

How Does an Air-powered Vacuum Generator Work?

Compressed air powered vacuum pumps, also known as vacuum generators, employ the Bernoulli principle which states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy.
The simplest single-stage vacuum generator consists of two nozzles housed in a body with connecting ports.  The first nozzle is supplied with compressed air and is shaped to funnel airflow into a reduced diameter passage to increase its velocity in the gap between the first and second nozzle so the low-pressure zone (vacuum) occurs in the gap and is available to do work by, for example, connecting to vacuum cups.  The airstream continues to expand through the larger second nozzle and exits to atmosphere through the exhaust port.
A two-stage vacuum pump consists of three nozzles having successively larger diameter passages.  Airflow from the second nozzle passes into the third nozzle in order to extract more energy from the airstream before exhausting to atmosphere.  The first stage develops deep vacuum but with low vacuum flow and the second stage produces shallow vacuum but with high vacuum flow.  These very different performance characteristics are beneficially combined by adding a flapper-style check valve between the two stages.
Compressed air consumption for either single-stage or multi-stage vacuum pumps is determined solely by air supply pressure plus the size and shape of the first nozzle.  As long as the air supply pressure remains constant, air consumption for a particular pump will be the same whether the pump is operating at high-flow deep vacuum or at low-flow shallow vacuum conditions.

Multi-Stage Classic Vacuum Pumps and Generators from EDCO USA

EDCO USA’s classic vacuum pumps are our most popular multi-stage pump. Larger vacuum flow capacity pumps are created by placing identical nozzle sets in a parallel. This can be done by adding nozzle sets in the primary body or by using an additional stack module.
Additional vacuum flow capacity is attained by adding nozzle sets but maximum vacuum level is not affected since the nozzle series is the determining factor. This additive construction method provides a specific, repeatable incremental flow capacity increase that is very handy when sizing a pump since the basic shape of the performance curve doesn’t change. A simple scale factor can be used since vacuum flow and air consumption are increased in proportion to the number of nozzle sets while system evacuation time is decreased proportionately.

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 from the vacuum port 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 vacuum level in the system increases to the point where the flap check valve closes to isolate the first-stage from the second stage. 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’s classic vacuum pump nozzles are optimized to give extra vacuum flow at deeper vacuum levels to more-than compensate for lower flows from zero to 3 inHg. For example, EDCO evacuation times to 12 inHg will be equal to or better than the competition.

Additional Features of our Vacuum Pumps

  • Multi-Ejector
  • Stainless Steel Valve Plate
  • Eight Available Capacities
  • Six Available Ejector Series
  • STC34M Silencer Included
  • Optional Switches / Sensors
  • Classic models are available with integrated vacuum filters

Contact EDCO USA for Multi-Stage Classic Vacuum Pumps

EDCO USA offers a variety of vacuum pumps to meet any of your application needs. From mini-classic vacuum pumps to triple-base classic vacuum pumps, we manufacture compressed air-powered vacuum pumps that are perfect for any pick and place vacuum system.

To learn more about our multi-stage classic vacuum pumps, contact us today or request a quote.

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