Product Information of JAPAN EJECTOR ENGINEERING CO., LTD.

Classification of Ejectors

Steam Jet Ejector Series Water Jet Ejector Series Sa  : Steam Ejectors Wa: Water Ejectors Sb  : Steam jet Blowers Wb: Jet Scrubbers Sc  : Steam Jet Compressors Wc: Water Jet Compressors Sd1 :Steam Jet Syphons Wd: Water Jet Eductor Sd2 :Steam Jet Heaters We: Water Jet Solid Eductor Se  : Steam Jet Slurry Ejectors Gas Jet Ejector Series Others Ga: Gas Ejectors Hydro-Steam Ejector Units Gb: Gas Jet Blowers Water Jet Condenser Gc: Gas Jet Compressors Steam Desuperheaters Gd: Gas Jet Syphons Jet-Ring Vacuum Pump System Ge: Gas Jet Feeders Chilled Water Plants   Barometric & Surface Condenser

General Information of Ejectors

Designing ejectors requires extensive skill and experience, but in fact that it is quite simple. Ejectors are made up of following three parts and put them together in proper positions. 1) Jet Nozzle (a covering nozzle for actuating liquid, an expanding nozzle for actuating gas)  2) Diffuser (also called a tail or throat) 3) Suction Chamber (body)

Jet device, referred to as "ejector", which includes all types of jet pumps have no rapidly rotating parts, utilize fluids in motion under controlled conditions, and discharge at a pressure intermediate to motive and suction pressures into energy of motion. The ejector's operation and transformation of energy of pressure into the motion is described as follows:

Motive Power is provided by high-pressure stream of fluid directed through a nozzle that is designed to produce the highest velocity possible. By mixing the motive fluid, jetting from the nozzle with the suction fluid in the suction chamber produce a mixture of stream traveling to the diffuser at a lower velocity.

When the mixtures reach at the diffuser, they gradually reduce the speed and recover the energy of pressure at discharge with very little loss.

There is no definite ejector theory at present. Ejectors designs are based on the theory of nozzle and diffuser areas and on a combination of theory and empirically determined coefficient for lengths and shape.

The most efficient ejectors are obtained through experimentation of prototype and further examined estimated design.

In order to manufacture the efficient jet units, it requires having proper manufacturing facilities as well as extensive testing facilities.

Ejectors are manufactured with any machinable materials. Units can be made from cast iron, bronze, stainless steels, carbon steels, titanium, carbon, polyester-fiberglass, polyvinyl chloride, and more, depending on the application.  Also units can be equipped with lining work with lead, rubber, phenol resins and others.

One of the distinctive advantages of ejectors compared with the like of pumps is that they are quite simple in construction, have no rotating parts to wear or break. There is no need for adjustment, easy to maintain and abrasion resistant materials would be used for possible corrosion, erosion.

Ejectors require relatively little space and little attention, and can be installed in remote, hazardous and inaccessible places. Periodic inspection is also easy that they can be quickly fixed or replaced with no lubrication requirements.

Compared to the work required for designing and manufacturing ejectors, the size of ordinary units is small which lowers the cost accordingly.

Today ejectors have been used throughout the industry, and new uses are constantly developed. Based on our full experiences, excellent test facilities and engineers, we will cooperate with you designing to meet the requirement of your special needs and applications.

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