Ejector Pump Reviews and Guides

The ejector pump articles provides guidance and review about different types, qualities, durabilities, and prices. Ejector pumps are the pumps that use motive fluids to pump the fluids. Motive fluids are the fluids in motion. 

The fluid that is to be pumped is called as the suction fluid. These pumps work on the venturi effect using a converging-diverging nozzle and pump the fluid. Ejector pumps do not have any mechanical components as the motive fluid is used for the pumping purpose.

Due to their ability to operate with high-velocity fluids, ejector pumps are also called as the jet pumps. If steam is used as the motive gas, the pump is called as the steam jet ejector.

Ejector Pumps Working Process

Before looking into the working of ejector pump, let us look at the venturi effect for easier understanding.

Venturi effect – It can be simply said as the process of increasing the fluid velocity by passing through a restricted and constrained passage. When the fluid passes through the restricted path, the fluid pressure drops and subsequently velocity increases. The fluid gains kinetic energy due to the pressure drop.

Now let us see how this venturi effect helps in the operation of the ejector pumps. The pump consist of the following main components.

• Inlet chest – the place where the motive fluid is sent inside the pump.
• Motive nozzle – nozzle has a small passage through which the motive fluid flows.
• Casing inlet – the place where the suction fluid comes inside the pump.
• Inlet diffuser – position where both the motive fluid and the suction fluid diffuse.
• Outlet diffuser – both the fluids exit through this region.

First, the motive fluid enters through the inlet chest and flows to the nozzle. At the nozzle, there is a restriction in the flow. The motive fluid loses pressure and picks up velocity and flows to the diffuser inlet.

The suction fluid comes into the casing inlet and meets the motive fluid at the diffuser inlet. The diffuser inlet has a small flow space than the casing inlet so the suction fluid also increases the velocity.

The velocity of fluid depends upon the restriction in the passage. And the velocity of the suction fluid is less than the velocity of the motive fluid. So the kinetic energy of motive fluid takes away the suction fluid outside the diffuser.

When both the fluids mixes, the motive fluid takes away the suction fluid along with it to the diffuser outlet. At the diffuser outlet, the passage space increases gradually and pressure increases across both the fluids thereby decreasing their velocities. 

Jet ejectors are used to compress the gases, create the vacuum, to transport the granular solids, mix liquids and gases and to convey liquid in various applications. The motive fluid might be steam, compressed gas or air, atmospheric air, water or any other fluids.

Benefits 

• No power source except the motive gas.
• Easy to install
• No moving parts so wear and tear.
• Highly reliable
• Less maintenance cost
• High vacuum capability at high suction load.

Limitation

• Require continuous steam of the motive fluid supply.
• Motorized valves are required to control the flow.

Application

• Ship-building – They are used for evacuating the suction line in other non-self-priming centrifugal pumps.
• Chemical industries – lower the suction pressure and indirect conveyance of the liquids.
• They are used to refill water in the boilers of the steam engines.
• Sewage treatment – they are used to pump out the unwanted fluid collected near our home bathroom. They are pumped to the drainage system.
• Paper industries – they are used in the uniform steam circulation and temperature distribution processes in paper industries.
• They are used as the primary fuel feed pumps in the aircraft engines.
• Wastewater treatment plants – they are used for waste water aeration in the aeration tanks, disinfection of the potable water and de-acidification processes.
• They are also used in gas cleaning, oil processing, fertilizer and textile industries for various applications.

Brands and Prices

These pumps are used in a vast variety of applications from cleaning household sewage water to injecting the airplane fuels. Few leading ejector pump manufacturers are 

• Wayne pumps & Zoeller pumps provide pumps for the home sewage treatment process.
• Korting Ejector Company & Croll Reynolds provides These pumps for industrial needs.
• All power labs provide pumps for shipping containers and gasifiers.
• Parker Industries supply pumps for airplane fuel injector. 

These pumps used for home purposes cost about 300$ to 1000$.Industrially used pumps may cost from 2000$ to as high as 10000$ depending upon their size and operation.

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