EMCO Venturi Tubes

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Different types of Venturi tubes 

There are two different types of Venturi tubes which each have their own specific advantages and disadvantages. The 2 types differ in such a way that the body of the Venturi tube can either be welded rolled sheet or machined from solid bar.

The machined Venturi tube allows us to make a Venturi body with large wall thickness, well-suited for high pressure applications i.e., high pressure steam from boiler process or high-pressure gas applications i.e. LNG process. Likewise, a machined Venturi body allows for producing quite small Venturi tubes i.e. 2” to 4”, where fabrication processes are less time consuming and therefore more cost effective.

The two different types have different advantages. The welded sheet Venturi is welded together in sections thus making it suitable for larger Venturi diameters in low pressure applications.

Welded sheet Venturi tubes are ideal for:

  • air flow intakes i.e. primary and secondary air intakes in boiler applications.
  • flue gas or exhaust gas going to chimney/stack
  • low pressure water application i.e. feed water process
  • low pressure steam applications i.e. industrial applications

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Definition Of A Venturi Tube

A Venturi tube is a short pipe with an inner constriction, that can be used either as a pump or to measure fluid flows.

The Venturi tube is designed by and named after the 18th–19th-century Italian physicist Giovanni Battista Venturi, who noted the effects that constricted channels have on fluid flow. Based on his observations he designed a device with a narrow throat in the middle, causing a phenomenon known as the Venturi effect. 

The Venturi effect states that the pressure will drop when a fluid passes through the tube and enters the narrow throat, which is the opposite of what one would immediately think. This relationship between pressure and velocity can be used to mix certain substances such as gasses or fluid with air at a continuous rate.

 

Examples Of Practical Applications Of Venturi Tubes:

The Venturi effect is widely used in industry and everyday products to mix different substances at controlled rates.

 

Here are some examples of where it is used:

  • in barbecues, gas stoves, bunsen burners and airbrushes
  • the choke on a car engine
  • the air pump on a fish tank
  • atomizers that disperse perfume or spray paint
  • foam firefighting extinguishers nozzles
  • sand blasters – draw sand in and mix it with air

eMCO CLASSICAL VENTURI TUBE

EMCO classical venturi tubes are used as primary elements in flow measurement of steam, liquid and gas according to the differential pressure principal in accordance with ISO 5167-4.

The body of the venturi tube is either welded rolled sheet or machined from solid bar.

The machined venturi allows us to make a venturi body with large wall thickness, well-suited for high pressure applications i.e., high pressure steam from boiler process or high-pressure gas applications i.e. LNG process. Likewise a Machined venturi body allows for producing quite small venturi tubes i.e. 2” to 4”, where fabrication processes are less time consuming and therefore cost effective.

The two different bodies impose different advantages. The welded sheet venturi is welded together in sections thus making it suitable for larger venturi diameters in low pressure applications.

Welded sheet venturi tubes are ideal for: