V-Cone Flowmeter Venturi Tube Nozzle Classic Venturi Tube Built-in Double Venturi Tube
,孔板、喷咀、文丘里管及均速管为代表的差压式流量计虽然经历过漫长的发展过程，在一定时期对流量作出过重要贡献，但人们在使用上述流量传感器时总感觉到一丝遗憾，因为它始终没有很好解决精度低、测量范围度窄、易磨损、现场安装条件要求高，不能测量混相流、脏污流等一系问题。 Differential pressure flow meters, represented by V-cone flowmeters , orifice plates, nozzles, venturi tubes and averaging tubes, have experienced a long development process and made important contributions to the flow in a certain period of time, but people are using the above The flow sensor always feels a bit regrettable, because it has not always solved the problems of low accuracy, narrow measurement range, easy wear, high requirements for field installation conditions, and inability to measure mixed-phase flow and dirty flow. In view of this, many domestic and foreign flow experts are committed to the research and development of new differential pressure flow sensors to make up for the shortcomings of orifice plates, nozzles, venturi tubes and averaging tubes. Various special throttle components are emerging in an endless stream, V cones Flow sensors are among the best. It also uses the throttling effect to measure the flow. Compared with other throttling fluids, it changes the throttling layout, from the traditional center hole throttling to the ring throttling, that is, the V-cone sensor uses a first-class linear cone suspension The fluid gradually shrinks to the inner wall of the pipe in the center of the pipe. This novel throttling effect makes it self-rectifying, self-cleaning, and self-protecting. From a large number of field actual use conditions, the V-Cone sensor's flow measurement effect is better than other Differential pressure sensor, it opened a new page for the use of differential pressure flowmeter.
V cone flowmeter offer, Venturi tube selection, V cone flowmeter selection, built-in double Venturi tube
Main parameters of V-cone flowmeter Measurement medium: liquid, gas, steam Nominal passage: DN25mm ～ DN2000mm
Nominal pressure: ≤16MPa; maximum ≤42.0MPa
Working temperature: -40 ℃ ～ 600 ℃
Ambient temperature: -40 ℃ ～ 60 ℃
Relative humidity: 5% ～ 90%
Flowmeter accuracy: ± 0.5%, ± 1.0%, ± 1.5%
Repeatability: 0.15%, 0.33%, 0.5%
Range degree (range ratio): 10: 1
Applicable Reynolds number: 8000 ～ 1 × 107
Structure: flange connection type, wafer type, special (according to user requirements)
Installation straight pipe length: generally upstream 1 ～ 3D, downstream 0.5 ～ 1D
Material: carbon steel, SUS304, SUS316L, other flow directions: horizontal, vertical, other equivalent diameter ratio: 0.45 to 0.85
Recommended application Saturated steam flow measurement Natural gas, blast furnace gas, coke oven gas, hydrogen, nitrogen, hydrocarbons, single-component gas, multi-component gas, air and other gas flow measurement and detection Flue gas and other exhaust flow detection Where water, liquefied petroleum gas, refined oil, crude oil, methanol, ethylene glycol, toluene, ammonia, hydrogen peroxide, various aqueous solutions and other flows are used in various slurry pipelines where dirty media are used, the accuracy requirements are not sufficient in straight sections. Higher occasions Multiphase fluid measurement Wet gas flow measurement
是一种新型差压式流量计，它由V锥流量传感器、引压附件与差压变送器组成。 V-cone flowmeter is a new type of differential pressure flowmeter. It consists of V-cone flow sensor, impulse attachment and differential pressure transmitter. The V-cone flow sensor is composed of the on-flow and back-flow conical cores coaxially installed in the measuring tube. The fluid gradually throttles along the on-flow conical core to the vicinity of the inner wall of the pipe, and then follows the inner wall of the pipe and the back-flow cone. The core flows out, forming a certain pressure difference between the upstream of the forward cone and the downstream of the backflow cone. The pressure difference can be used to measure the difference between the pressure attachment and the differential pressure transmitter to achieve the function of flow measurement. STV series V-cone flowmeters are widely used in petroleum, chemical, natural gas and other fields due to their simple structure, robustness, easy replication, strong versatility, and low cost. This product overcomes its own shortcomings such as standard orifice plates, venturi tubes, nozzles and other throttling devices, such as easy wear, large pressure loss, small range (range ratio), high field installation conditions, and requiring long straight pipe sections. Accurate measurement of various fluid flows over a wide range of Reynolds numbers. Compared with ordinary differential pressure flowmeters, STV series V-cone flowmeters have high accuracy, long-term accuracy, good repeatability, limited installation conditions, wear resistance, wide measurement range, suitable for dirty media, and pressure loss. Small, long life and so on. Can be widely used in various fields, suitable for measuring water, oil, various liquids, steam, air, natural gas, coal gas, petroleum gas, organic gas, oil residue, etc.
Features 1. Low installation requirements: front 0-3D straight pipe section, rear 0-1D straight pipe section,
2. Wide range ratio: usually 10: 1, choosing the right parameter can achieve up to 50: 1
3. Low pressure loss: the same β value, the pressure loss is 1/3 ～ 1/5 of the orifice plate
4. Abrasion resistance: After the streamlined cone is throttled, a vacuum layer effect is generated on the surface of the cone, making the cone difficult to wear. 5. Non-clogging and non-adhesion: The cone-shaped thorough purging design avoids residues in the fluid, Retention of condensate or particles 6. Good long-term stability: β value can be unchanged for a long time and ensure long-term accurate measurement 7. High accuracy: ± 0.5%
8. Good repeatability: better than 0.1%
9. Signal stability: "Signal fluctuation" is 1/10 of the orifice plate
10. Wide β value range: The unique geometry of the V-cone flow sensor allows a wide range of β values. 11. Wide pipe diameter range: Pipe diameter size from 15mm to 2000mm
12. Measurable high-temperature and high-pressure media: The maximum working temperature is 850 ° C and the maximum pressure is 40MPa.
13. Measurable dirty media (coke oven gas, blast furnace gas, raw oil, residue oil, etc.)
14. Measurable gas-liquid two-phase medium (moisture, condensate, etc.)
是由V锥传感器和差压变送器组合而成的一种差压式流量计，可精确测量宽雷诺数范围内各种介质的流量。 Measuring principle V-cone flowmeter is a differential pressure type flowmeter composed of V-cone sensor and differential pressure transmitter. It can accurately measure the flow of various media in a wide Reynolds number range.
Its measurement theory is that because the actual fluid is viscous, it is not an ideal fluid. When it flows in the pipeline, it has two flow states, laminar and turbulent, on the premise of fully developing the flow in the pipe. According to the principle of conserving energy of continuous flowing fluid and the Bernhard's equation: For a fluid flowing in a laminar state, its velocity distribution is a parabola symmetrical about the centerline of the pipe. The flow velocity distribution of a fluid flowing in a flow state is an exponential surface with the pipe centerline as a symmetry. The pressure drop of a fluid through a certain pipe is proportional to the square of the flow rate.
The V-cone sensor is a V-cone that is coaxial with the centerline of the pipe in the measuring tube. The measuring tube and V-cone of the sensor are designed and precision machined. When the fluid flows through the V-cone in the measuring tube, the flow pattern locally re-forms before the V-cone, the flow velocity increases, the static pressure decreases, and a pressure difference ΔP occurs before and after the V-cone. Measure the high pressure (static pressure) PH at the upstream pipe wall (before the fluid shrinks), and open the pressure port at the central axis of the downstream end face of the V cone to obtain the low pressure PL (static pressure).