When it comes to precisely measuring the flow of aggressive and non-aggressive gases, vapours and liquids, a Venturi tube is an excellent choice. Venturis enable minimal pressure losses at high mass flows. The short inlet and outlet sections are particularly advantageous for this type of differential pressure sensor. From the oil and gas industry to the chemical industry, especially petrochemicals, or even in power stations, our flow meter in accordance with ISO 5167 are used. Due to their precise and reliable measurement, a Venturi flow meter is generally very popular in plant engineering.

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The advantages of restriction orifice plates:

• Customized: In accordance with ISO 5167, there are three versions of Venturi tubes, which we adapt specifically to your systems and requirements.

• Precise: Thanks to their precision in differential pressure measurement, Venturis ensure a long service life for the entire system.

• Flexible: A Venturi tube is suitable for many different media and can be manufactured in different diameters.

• Economical: The long-term accuracy and reliability of Dosch Venturi tubes lead to a reduction in operating costs and incorrect measurements.

Averaging pitot tube are primary elements for measuring the flow of gases, steams, and fluids. Compared to differential pressure devices in accordance with ISO 5167, their benefits are their very low pressure losses and very flexible installation options.

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Designs:

​Pitot tubes operate on a similar principle to differential pressure elements to ISO 5167.

The tube projects into the pipeline and is divided into two pressure chambers (upstream and downstream), each with several pressure tapping holes.

On the upstream side the total pressure is applied, on the downstream side a negative pressure is generated. The pressure difference is measured by a differential pressure device outside the pipeline and thus the flow rate is determined.

The pressure holes distributed over the flow cross-section give a good averaging of the pressure signal. This reduces the requirement for a uniform flow profile, i.e. the required length of the stilling section.

Wedge meters are particularly suitable for flow measurement in the case of low Reynolds numbers and fluids containing solids. Their design results in significantly less wear than for orifice plates.

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Designs:

The pressure tapping fittings are positioned upstream and downstream of the wedge and are usually equipped with flange connections DN 50 (2“) or DN 80 (3“). Primary elements with diaphragm seals are used for differential pressure sensing.