Venturi Fluid Jets Ejectors
Venturi Fluid Jets (or ejectors) are components that operate on the ejection principle. This means that there are no moving parts and the medium is moved by means of pressurized fluids, steam or compressed air in combination with the internal geometry of the component.
A Venturi Fluid Jet consists of three components: the nozzle, the body and the diffuser. Through the suction side (nozzle), a pressurized liquid, steam or gas is supplied. This is the motive, also called the flotation medium. Because of the geometry of the body, the flow energy in this motive creates a suction force that sets the other fluid or gas in motion. This secondary flow is called suction medium.
The design of the diffuser creates a back pressure on the ejector's output side that is higher than the suction pressure, thus dissipating the newly mixed flow. This allows an ejector to be used in places where there is no possibility or desire to deploy a pump with a drive motor. All that is needed to make the ejector a pump with no moving parts is a floating medium.
Depending on the design, ejectors can move liquids, solids, slurries, steam and gases. Thus Venturi Fluid Jets can be used for displacement, pumping, suction, mixing, heating, cooling and for the protection of various media.
- Range: DN15 to DN600
- Pressure: 0 barg to 100 barg (PN10 - PN100 and ANSI 150lbs. -600 lbs.)
- Temperature: -60⁰C to 450⁰C
- Design: 2 piece, 3 piece or 4 piece housing
- Housing material: cast iron, steel, stainless steel, PVC
- Lineation possible: from PTFE
- Exotic materials possible: yes
- Design: made to measure
Advantages of this design
- An ejector has no moving parts and requires no external energy or actuation. As a result, an ejector has few or no wearing parts and therefore very little wear.
- Thanks to the compact design, an ejector is very easy to install in confined or hazardous areas. An ejector guarantees a reliability of 100%, provided the calculation has been carried out correctly and provided the supply is carried out in accordance with the calculations.
- An ejector is well suited for discontinuous and intermittent use and is not prone to wear in these circumstances.
Applications for ejectors
- Lifting a medium from a pit or lower part of the system.
- Pumping a medium to move it.
- Dosing, mixing or diluting media.
- Moving a fixed medium/solids.
- Injecting steam for heating.
- Creating a vacuum to realise the evacuation of gases.
- Desuperheating steam.
- Heating and cooling liquids through circulation.
- Various other applications possible.
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