Venturi Jets (Ejectors)
Venturi Jets (Ejectors)
Venturi Jets (or ejectors) are components that operate on the eject 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 Jets consists of three components: the nozzle, the body and the diffuser. A pressurized liquid, steam or gas is supplied through the inlet side (the nozzle). This is the motive, also called the ''flotation medium.'' Because of the geometry of the body, the flow energy in this motive flow creates a suction force that sets the other fluid or gas in motion. This secondary flow is called ''suction medium.''
Due to the design of the diffuser, a back pressure higher than the suction pressure is created on the ejector's exit side, which dissipates 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 without moving parts is a flotation medium.
Depending on the design, ejectors can move liquids, solids, slurries, steam and gases. Thus, Venturi Jets can be used for displacement, pumping, suction, mixing, heating, cooling and for the protection of various media.
Specifications
- Range: DN15 to DN600
- Pressure range: 0 barg to 100 barg (PN10 - PN100 and ANSI 150lbs. -600 lbs.).
- Temperature range: -60⁰C to 450⁰C
- Design: 2-piece, 3-piece or 4-piece house
- Housing material: cast iron, steel, stainless steel, PVC
- Lineation possible: out of PTFE
- Exotic materials possible: yes
- Design: custom-made
Advantages of this design
- An ejector has no moving parts and requires no external power or drive. As a result, an ejector has few to no wear parts and thus very little wear and tear
- The compact design makes an ejector very easy to install in confined or hazardous areas. An ejector guarantees 100% reliability if the calculation is done correctly and if the supply is carried out in accordance with the calculations.
- An ejector is well suited for intermittent discontinuous use and is not susceptible to wear under these conditions.
Applications for ejectors
- The lifting of a medium from a well or lower part of the plant.
- Pumping a medium for the purpose of displacement
- Dosing, mixing or diluting media.
- Moving a solid medium/solids.
- Injecting steam for the purpose of heating
- Creating a vacuum to achieve evacuation of gases
- De-superheating steam
- Heating and cooling of liquids by circulation
- Various other applications possible
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