The Venturi nozzle flowmeter is a differential pressure flow measurement instrument that combines the characteristics of the Venturi tube and the nozzle. It calculates the flow rate by measuring the pressure difference generated when the fluid flows through the nozzle.

• Short installation length: The body length is shorter than that of the classic Venturi tube, making it suitable for pipelines with limited space.
• Standard design: Common ISA1932 nozzle, in line with international standards, ensuring measurement consistency.

The Venturi nozzle inherits the advantages of both its "parents":

1. Low pressure loss (inheriting the advantage of the Venturi tube)

   Thanks to the presence of the diffuser section, its pressure recovery capability is far superior to that of standard orifice plates and nozzles. The permanent pressure loss is usually 50% - 80% lower than that of orifice plates, resulting in significant energy-saving effects. Although the pressure recovery efficiency (about 85%) is slightly lower than that of the longer classic Venturi tube (about 90%), it is still very excellent.

2. High precision and stable flow coefficient (inheriting the advantage of the nozzle)

   The nozzle's profile is streamlined, insensitive to wear, and its flow coefficient is supported by a large amount of international standard data, thus ensuring high accuracy, typically ±0.75% to ±1.5%, with excellent repeatability.

3. Low requirement for upstream straight pipe section

   Due to its streamlined inlet, it is less sensitive to the velocity distribution than orifice plates. The required upstream straight pipe section is usually shorter than that of orifice plates but slightly longer than that of classic Venturi tubes.

4. Wear-resistant and dirt-tolerant

   The smooth inlet contour enables it to withstand fluids containing a small amount of solid particles without easy wear or clogging.

5. Short overall length and compact structure

   Compared to classic Venturi tubes, the Venturi nozzle has a shorter overall length. This is because it replaces the longer classic contraction section with a shorter nozzle. This is an important advantage in situations where installation space is limited.

• Steam flow measurement: This is its classic application field. Steam systems usually have high energy consumption. The low pressure loss characteristic of the Venturi nozzle can save a lot of energy, and its high accuracy can meet the requirements of monitoring and settlement.
• High-pressure gas measurement: Flow measurement of natural gas, compressed air, and process gas.
• High-temperature and high-pressure feedwater: In power plants, it is used to measure the flow of boiler feedwater.
• Liquid processes requiring energy conservation and accuracy: Such as key processes in the chemical and petrochemical industries.

In summary: The Venturi nozzle is a "compact and economical" variant of the classic Venturi tube. It significantly shortens the length and reduces the cost at the expense of a small portion of pressure recovery performance, while maintaining the core advantage of high accuracy.

The Venturi nozzle flowmeter is an "all-rounder" among differential pressure flowmeters. It does not have the significant pressure loss of orifice plates, nor is it as expensive and bulky as the classic Venturi tube.

It achieves an excellent balance between performance, cost, and size, making it particularly suitable for precise and energy-efficient measurement of steam, gas, and high-pressure liquids. When you need higher efficiency and accuracy than orifice plates but are constrained by the budget or space requirements of classic Venturi tubes, the Venturi nozzle is almost the perfect compromise.