The HUALIU orifice flowmeter is a high-turndown differential-pressure device that combines a standard orifice plate with a multivariable DP transmitter (or a DP transmitter, temperature transmitter and pressure transmitter). As a differential-pressure (throttling) flowmeter, it consists of a primary element (throttling element) and a secondary device (DP transmitter and flow indicator). It measures the flow of gases, steam and liquids over a nominal bore range of DN15–1200 mm and is widely used for process control and metering in the petroleum, chemical, metallurgical, power, district-heating and water-supply industries, making it an important measuring tool for saving energy and improving economic returns in industrial and agricultural production.

The standard throttling element uses a universal geometry recognized by international standards organizations and can be put into service without flow calibration — the only flow sensor with this characteristic. Its structure is simple and robust, easy to reproduce, and stable and reliable in performance; because the primary element and the DP indicator can be manufactured separately, it lends itself to specialized, large-scale production. The product has a broad application range, covering single-phase fluids (liquid, gas, steam) as well as some multiphase flows, and adapts to the various pipe diameters and operating conditions (temperature, pressure) of general production processes.

The HUALIU orifice flowmeter offers four pressure-tapping arrangements — chamber (corner ring), flange, D and D/2 (radius), and corner tappings — and two structural forms: integral and remote. The transmitter can be selected for micro-differential, standard-differential or high-differential ranges, and supports temperature compensation, pressure compensation or combined temperature-and-pressure compensation to meet the demand for stable measurement across diverse conditions such as high temperature, high pressure and large bore.