The HUALIU balanced flowmeter is a high-performance differential-pressure flow instrument. Breaking through the limitations of the conventional single-hole throttling device, it adopts a symmetrical multi-hole balanced throttling structure; through equal-Reynolds-number design, increased throttling-element thickness and higher machining precision, its flow performance approaches that of a Venturi tube, achieving a qualitative improvement while keeping the structure simple and safe. Its operating principle is the same as that of other DP flowmeters: the multi-hole structure balances and conditions the flow field, effectively reducing eddies, vibration and signal noise, so that a stable differential-pressure signal is obtained at a relatively small permanent pressure loss, delivering high-accuracy, long-term-stable flow measurement.

Thanks to the multi-hole balanced design, the flow-field stability is greatly improved and the measurement accuracy is 5–10 times higher than that of conventional throttling devices; flow-calibrated accuracy reaches ±0.3% or ±0.5% with repeatability up to ±0.1%. The pressure-recovery rate is about twice that of conventional throttling devices, and the straight-run requirement can be as low as 0.5D–2D, which is especially economical for special or expensive piping. The symmetrical balanced structure reduces eddy formation and turbulent friction, lowering the permanent pressure loss by about 70% compared with conventional throttling devices — close to that of a Venturi tube — and can significantly reduce long-term operating costs.

The product has a wide turndown ratio, resists fouling and is not prone to clogging; the multi-hole design distributes the load and has no sharp-edge wear, the β value remains constant over the long term, and the unit has no moving parts, extending service life by 5–10 times over conventional throttling devices. With a nominal bore range of DN15–DN3000, it is suitable for measuring liquids, gases, steam and bidirectional flow, can be optionally equipped with temperature and pressure compensation, and is widely used in custody-transfer metering and process control.