What is the difference between adjustable flow meters and balanced flow meters?
Thread Content
In both adjustable flow meters and balanced flow meters, under the conditions of ideal fluids, the flow rate in the pipeline is proportional to the square root of the pressure difference; by measuring this pressure difference and applying Bernoulli’s equation, it is possible to calculate the flow rate in the pipeline. But how can one distinguish between them when selecting instruments?
Adjustable flow meters are commonly known as balance flow meters or porous flow meters.
Adjustable orifice plate, 4 holes； Porous balance flowmeters usually have more than 4 pores.
Can then the V-cone also be considered an adjustable flow meter?
In fact, they are all porous orifice plates. Rosemount fixes 4 holes; such a plate is called an adjustable orifice plate. The number of holes in the a+k type varies, and it is referred to as a balanced flow meter
The adjustable flow meter is a product of Emerson; together with the balanced flow meter, it belongs to the category of differential pressure flow meters. The concepts of balanced flow field and adjustable flow field are similar, but there are significant differences in terms of performance. The adjustable flow meter has a fixed 4-port design, with certain limitations on diameter; its performance is slightly better than that of orifice plates. The balanced flow meter is a revolutionary product among differential pressure flow meters; it can be said to be the one with the best overall performance among all such meters. The first balanced flow meters were invented by Americans, and later they were introduced to the Chinese market. Many manufacturers in China began producing porous orifice plate flow meters that resemble them in appearance and shape. Even Emerson started researching balanced flow meters, and eventually they developed a 4-orifice adjustable flow meter. The A+Qmc balanced flow meter is a patented product manufactured by A+Flow, a company under NASA in the United States. It originated from the need to measure liquid oxygen in the main engines of space shuttles. Based on principles of fluid dynamics, simulation data, and experimental results, it features an optimal hole layout designed to ensure equilibrium of kinetic energy and momentum. It is a high-performance flow meter; the number of functional holes can be customized between 4 and 32, allowing for different hole layouts depending on the specific operating conditions. The only authorized manufacturer of the A+Qmc balanced flow meter in China is Aijia Fluid Control (Shanghai) Co., Ltd.