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### Type：CX-VCFM cone flow meter

Illustrate：V-cone flowmeter can measure gas phase, mixed gas phase, liquidoid, mixed liquidoid, gas-liquid phase (quality ratio of moisture and liquidoid is ≤5%), powder, dirty liquid with high viscosity, high velocity of flow and suspending solid particles, liquid vibration, electromagnetic interference and other media values under various working condition (temperature and pressure).

CX-VCFM Cone Flow Meter

**Summary**

**Principle of work**

When the flow velocity keeps the same, the differential pressure value will be larger with a bigger throttling area. βvalue= the throttling area of the cone/ the sectional area of the pipeline inner diameter (or the diameter ratio)

2.

β: the throttling coefficient; D: the pipeline inner diameter; d: the cone outer diameter

The figuration of cone has not been decided until years of continuous experiment, eva luation, and improvement, enjoying the best appearance among this type of flowmeter. It can be used in different working conditions. We can comprehend the capacity of V-cone flowmeter by dint of pipeline flow velocity curve. If the medium passes through a pipeline without any block or interference, its flow velocity will be equably distributed. The flow velocity close to the pipeline wall is nearly zero, while the flow velocity in the center reaches its maximum. (See Figure 2) If we hang the cone in the center of pipeline, it will directly touch the fluid high-speed area, compelling fluid in this area to mix with fluid in low-speed area to homogenization the flow velocity, which makes the measurement of flow velocity more accurate.

In actual working condition, it is difficult to homogenization the flow velocity, because many factors will cause asymmetry of fluid distribution. Any changes on pipeline may influence the fluid, such as elbow, valve, diameter reducing, diameter increasing, pump, tee joint, etc. the V-cone flowmeter reshapes the flow velocity curve using the cone

(see Figure 3), and the fluid is almost equably distributed after the commutation, ensuring a comparatively high measuring precision in bad condition, which makes it possible to apply V-cone flowmeter in more fields.

Precision and repetitiveness

The positive pressure hole of V-cone flowmeter is set on the pipe wall in upstream cone, and the pressure measurement points are chosen in the isodromic area of frictionless fluid, which is in accordance with Bernoulli’s theorem and has a stable positive pressure signal. The negative pressure hole is in the central bottom of the cone, just right in a downstream area that has the lowest pressure. Due to the symmetric construction of the cone center which makes the flow field of the central bottom of the cone relatively static, there is only a small swirl with high frequency and low extent in negative pressure area after fluid throttle, making the fluctuation of negative pressure signal quite small, the output differential pressure signal stable. Meanwhile, the sensor accuracy excelling ±5% of the reading, the repetitiveness being ±0.1%, and the accuracy of trade measuring type reaching ±0.3%

Measuring range ratio and loss of pressure

The measuring range ratio of V-cone flowmeter under normal conditions is 10:1, which can even be 30:1 with proper parameter. Under the same βvalue, the permanent pressure loss of V-cone flowmeter is approximately 1/5~1/10 of pore plate (see Figure 5), substantially reducing energy consumption.

Figure 5 comparison of pressure loss of flowmeter

**Outside view**

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