Why is it required that the straight pipe section of the balanced flowmeter be short?

Final translation: 

One-sentence conclusion: 

Because it integrates "rectification + measurement" onto a single orifice plate, it inherently possesses the "fluid shaping" function. 

1. Ordinary orifice plate / Standard orifice plate: The reason for the long straight pipe section 

The ordinary orifice plate has only one circular hole: 

There are bends, valves and reducers ahead → The fluid experiences turbulent flow, deviation and vortex. 

The turbulence directly hit the single hole → The measurement is inaccurate 

Therefore, a long straight pipe section (10D to 40D in length) is necessary to allow the water flow to naturally become stable. 

This is the fundamental reason why traditional flow meters require a long straight pipe section. 

2. Balanced flowmeter: Symmetrical porous design = Built-in rectifier 

The structure of the balanced flowmeter is: 

One central hole + a symmetrical ring of multiple holes around it 

Function:

No matter how chaotic the flow is coming in 

2. Severely divided, sorted out and smoothed by symmetrical porous structures 

3. The flow field instantly becomes uniform and stable. 

4. The vortices and off-center flows are directly "corrected" 

Equal to: 

Balanced flowmeter = Integrator + Standard Orifice Plate combined into one unit 

3. Result: The straight pipe section has been significantly shortened. 

Because it can conduct the current by itself and does not need to rely on long straight tubes to stabilize the current: 

Standard orifice plate: The straight pipe section in front is 10D to 40D. 

Balanced flowmeter: The straight pipe section in front only requires 0 to 3D. 

The more chaotic the flow field is, the more obvious its advantages become. 

Summary for concise presentation 

The balanced flowmeter adopts a multi-hole symmetrical structure. 

It has its own rectification function, which can instantly level out turbulent or swirling flows. 

So there is no longer a need for long straight pipe sections to stabilize the flow. 

This is the fundamental reason why the straight pipe section of it needs to be extremely short.