Throttling devices are reliable flow measurement tools, though on-site pipeline installation can involve heavier workloads and carry minor risks of leakage or blockage.

Thanks to advances in differential pressure transmitters, modern integrated throttle flow meters (e.g., orifice plates, nozzles, annular orifice plates) are now more compact, stable, and easy to adjust.

Standard types: Standard Orifice, ISA Standard Nozzle, Long Neck Nozzle, Classic Venturi, Venturi Nozzle

Non-standard types: Annular Orifice, V-cone flow meter, wedge flow meter, etc.

Principle

When fluid fills the pipeline and passes through a throttle, the flow beam contracts locally:

 - Flow velocity increases

- Static pressure decreases

- A measurable static pressure difference forms before and after the throttle, which is used to calculate flow rate.

✅ Wide adaptability: Suitable for most liquids, gases, and even dirty fluids (with annular orifice plates).

✅ Proven reliability: Compliant with international standards (ISO5167 / GB/T2624) for consistent performance.

✅ Cost-effective: Simple structure, easy installation, and low maintenance compared to other flow meters.

✅ Compact design: Modern integrated models are smaller and easier to integrate into industrial systems.