What Is a Jet Nozzle?
The standard nozzle is a differential pressure generating device that measures the flow rate. It can be used with various differential pressure gauges or differential pressure transmitters to measure the flow rate of various fluids in the pipeline. Standard nozzle throttling device is used with differential pressure transmitter to measure the flow of liquid, steam and gas. Standard nozzle is widely used in petroleum, chemical, metallurgy, power, light industry and other departments.
- 1 The structure of the standard nozzle flow meter throttling device is easy to replicate, simple, sturdy, stable and reliable performance, long service life and low price.
- 2 Standard nozzle calculation adopts international standards and processing
- 3The standard nozzle flowmeter has a wide range of applications. All single-phase flows can be measured, and some mixed-phase flows can also be applied.
- 4 Standard type throttling device can be put into use without actual flow calibration.
- 5Using imported monocrystalline silicon intelligent differential pressure sensor
- 6 high precision, perfect self-diagnostic function
- 7 intelligent standard nozzle intelligent orifice plate flowmeter whose range can be adjusted by self programming.
- 8 Intelligent standard nozzle can display cumulative flow rate, instantaneous flow rate, pressure and temperature at the same time.
- 9 In addition to the online and dynamic full compensation function, the smart orifice plate flow meter also has self-diagnosis and self-setting range.
- 10 Equipped with multiple communication interfaces
- 11High stability
- Wide range of 12 ranges, greater than 10: 1
- 13 negligible effects of temperature and static pressure
- 14 Resistant to high overpressure [1]
- The measuring principle of the nozzle is based on the principle of throttling of fluid mechanics. The fluid filled in the pipeline, when they flow through the nozzle in the pipeline, the flow velocity will form a local contraction in the nozzle, so that the flow velocity is accelerated, and the static pressure is reduced. With the pressure drop or pressure difference, the larger the flow rate of the medium flow, the larger the pressure difference generated before and after the nozzle, so the size of the fluid flow can be measured by measuring the pressure difference.
- Because the nozzle adopts an arc-shaped contour structure, its pressure loss is small, the straight pipe section required is short, and the accuracy is high. [1]
- 1. Nominal diameter: 20mmDN630mm
- 2. Nominal pressure: PN32Mpa
- 3. Working temperature: -50 t550
- 4. Reynolds number range: 0.300.44, 70,000ReD10 7
When 0.440.8, 20000ReD10 7
- 5. Throat diameter ratio: 0.300.80
- 6. Accuracy: 0.5, 1.0, 1.5, 2.0
- 7. Reference standards: GB / T2624-2006, JJG640-94
- 8. Connection method: flange connection, welding [1]
- The traditional concept may think that > 0.7 will cause the measurement accuracy to be lowered, the Reynolds number limit to be lowered, and the requirements for straight pipe sections to be increased. In fact, such worry is unnecessary. Because for the nozzle:
- (1) Determine the higher aperture ratio , and the flow coefficient at this time. The additional error caused by the Reynolds number change surface is much smaller than that of holes and plates, which is suitable for use in fields with a large range of flow changes. This is even more apparent in the low Reynolds number range.
- (2) For smooth pipelines, the basic relative error of the flow coefficient mainly depends on the Reynolds number, but is little affected by the aperture ratio. If blindly reducing the aperture ratio does not greatly reduce the basic relative error of the flow coefficient like a standard orifice plate, it will increase a larger additional error due to the change in Reynolds number.
- (3) The flow coefficient of the standard nozzle is larger than the orifice plate, especially in the case of high value. The differential pressure of the throttle is much lower than that of the orifice plate. This reduces permanent pressure losses. Very suitable for large flow measurement. [1]
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