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In-Line Eductors

Superior By Every Measure

The Clark-Reliance Corporation, with its Jacoby-Tarbox® Eductors, delivers greater value for your investment on every count.  Their advanced design provides superior flow paths for optimum performance, while the rugged construction is your assurance of reliability on demanding applications.  They are backed by superior application engineering services, and can be supplied to meet tight delivery schedules.  In addition, they are offered at prices equal to or lower than other makers of eductors, or conventional electric pumps.

in line eductor

Advanced Design…Full ASME Ratings

Eductors feature an advanced design to assure flows better than those of other eductors.  Unlike typical cast units, which meet only a nominal pressure rating, Eductors meet rigorous ASME specifications.  All of our eductors have a smooth specified finish for critical flow paths.  In comparison, sections of the flow paths in competitive cast units may be left rough to keep production costs down.  Also, the mixing tube section of Eductors has been designed to withstand the stress to which it will be subjected.  This is the point at which many other makes are weak and subject to breakage during installation.  All units have wrench flats to prevent damage during installation.  Providing a smooth flow path is critical to optimum eductor performance.  As a result of this feature, the motive fluid achieves more velocity through the eductor body, and this means more energy is used for pick-up of the suction fluid.  Also, better flow paths in the diverging section of the eductor allow it to achieve better discharge pressures.


More Productive Than Electric Pumps – With Lower Initial & Upkeep Costs

Eductors offer many advantages over electric pumps.  They feature design simplicity, without rapidly rotating parts that are subject to leakage, wear and breakage.  Eductors are generally small in relation to the work they do, and they are low in cost.  They are easy to install and require few adjustments.  They are easy to inspect and clean, and never require lubrication.  In addition, they are ideally suited for use in hazardous locations, without the need for explosion proofing as may be required with electrical equipment.

Better Technical Capabilities

The Clark-Reliance Corporation staff has extensive experience in eductor technology.  Our engineers have the ability to computer-calculate the fluid and friction factors that can affect eductor operation.  And they are experts at computer-modeling the performance of the eductor.  Customer service is at the base of all technical activities.  Application engineering assistance takes the form of factory and field personnel on call for joint consultation with customers.  In short, the Eductor is the best choice for many applications.  Whether it is educting liquid, gas, steam, or solids, we have the right eductor for you.

Efficient, Trouble-Free Design


How Eductors Work

An eductor pump that uses a fluid to perform the work of pumping another fluid (or solid).  The fluid doing the work is termed the motive fluid, and the fluid being pumped is the suction fluid.  The motive fluid employed can be liquid, gas or steam.  The suction fluid can be liquid, gas or steam.  Other names for eductors include jet pumps, ejectors, venture pumps, siphon pumps, steam siphons, and injector pumps.  Eductors operate on basic principles of flow dynamics that have been known since the times of the ancient Greeks.  What makes the Eductors superior is the way advanced computer modeling has been used to maximize efficiency.  This same computer modeling allows Clark-Reliance to simulate your process needs and recommend the correct product every time.

Operation Is As Follows:

1. The pressurized motive fluid enters the eductor through the motive inlet and enters the nozzle.  The nozzle causes the motive entering to accelerate as it passes through the converging portion of the nozzle.  The nozzle is of the converging type if the motive is a liquid, or of the expanding type if the motive is gas or steam.
2. The suction chamber is where the pumping takes place.  As the accelerated motive leaves the nozzle, the friction between it and the material in the suction chamber forces the mixture into the diffuser section lowering the pressure in the chamber and pulling additional material in from the suction inlet.
3. The motive fluid entrains the suction media to produce a uniformly mixed stream traveling at a lower velocity.  The mixing tube in Eductors is amply sized to allow sufficient time for the two streams to mix completely.
4. The diffuser is specially shaped to reduce the velocity of the mixture still further, converting the kinetic energy to pressure at discharge.


Click here for the In-line Eductor Sizing Tool 
Size your own eductor application online. Designed in accordance with ASME specifications, and are manufactured using advanced casting and machining processes to maximize their flow efficiency.

Additional Resources:

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