The
balanced flow meter （BFM） is an advanced differential pressure flowmeter designed to enhance measurement accuracy and stability in industrial fluid systems. Rooted in NASA's aerospace technology, the BFM was initially developed for liquid oxygen flow measurement in space shuttle engines, leveraging computational fluid dynamics to optimize flow dynamics.
Core Structure and Functionality
The BFM features a multi-hole disc sensor installed perpendicular to the pipeline. Unlike traditional single-orifice devices, its function holes—distributed via proprietary algorithms—balance and rectify the flow field, minimizing turbulence and vortex formation. This design stabilizes pressure signals by reducing low-frequency fluctuations caused by downstream vortices, enabling precise differential pressure （ΔP） measurement. Paired with pressure tapping tubes and sensors, the BFM calculates volumetric or mass flow rates using Bernoulli's principle, where flow velocity correlates with the square root of ΔP.
Technical Advantages
High Accuracy & Repeatability: With linearity errors as low as ±0.3% （calibrated） and ±0.5% （geometric verification）, the BFM outperforms traditional orifice plates by 5–10 times.
Reduced Pressure Loss: Its pressure recovery rate is twice that of conventional devices, lowering permanent pressure losses to 1/3–1/4 of orifice plates, thereby cutting operational costs.
Short Straight Pipe Requirements: The BFM demands only 0.5D–2D upstream and downstream straight pipes, ideal for retrofitting into existing systems with limited space.
Wide Turndown Ratio: Capable of handling Reynolds numbers from <200 to >10⁷, the BFM achieves turndown ratios up to 30:1, exceeding the 10:1 limit of standard orifice plates.
Bidirectional Flow Measurement: Symmetrical design enables seamless measurement of reverse flows without recalibration.
Applications
Widely adopted in petrochemical, metallurgical, power generation, and LNG industries, the BFM excels in harsh environments involving high temperatures （up to 850°C）, high pressures （42 MPa）, and corrosive media. Its robustness and precision make it suitable for trade metering, process control, and research applications.
By integrating multi-hole rectification technology, the BFM redefines differential pressure flow measurement, offering unparalleled accuracy, reliability, and adaptability across industrial sectors.
