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- Dosch - Model H 800 - Venturi Tubes
Dosch - Model H 800 -Venturi Tubes
Venturi tubes are used as flow elements for flow measurement of aggressive and non-aggressive gases, steam and liquids where a very low pressure loss is required.
- Venturi tubes with an as cast convergent section
- Venturi tubes with a machined convergent section
- Venturi tubes with a rough-welded sheet-iron convergent section
Generally, the pressure tappings are designed with 4 bore holes which connect to a ring chamber or an annular ring. For some applications, however, it is recommended to design them with single bore pressure tappings. In special cases, venturi canals with a rectangular cross-section may be furnished, which are being manufactured from sheet-iron and which are not part of the calculation standard.
Due to their design, venturi tubes generate very low pressure losses.In comparison to orifice plates and nozzles, they only need short inlet straight pipe sections.Venturi tubes with an as acast convergent section offer the lowest uncertainty of all venturi tube designs, which results from the special processingof the inner edges in between the different sections(edge radius).
Between 0,7% - 3% of the discharge coefficient C, depending on the application
The pressure loss depends on the diameter ratio p (d/D) and amounts to approx. 5 - 20% of the differential pressure.
- Venturi tubes with a machined convergent section DN 50 to DN 250 (2" to 10")
- Venturi tubes with a rough-welded sheet-iron convergent section DN 200 to DN 1200 (8" to 48")
- Venturi tubes with an as cast convergent section DN 100 to DN 800 (4" to 32")