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1. Overview of Standard Nozzles
A standard nozzle is a device specifically designed for measuring flow. It belongs to a differential pressure generator and is usually used in conjunction with a differential pressure gauge or transmitter. These nozzles can accurately measure various fluids, including liquids, vapors, and gases, and are widely used in many fields such as petroleum, chemical, metallurgical, power, and light industry. When the fluid passes through the standard nozzle inside the pipeline, it undergoes a critical throttling process. The fluid stream contracts at the throttling element, causing a sharp increase in flow velocity and a decrease in static pressure. This process will generate a significant pressure drop, which is commonly referred to as pressure difference. The magnitude of pressure difference directly reflects the magnitude of fluid flow rate, which is measured based on the principles of energy conservation law and flow continuity law. The intelligent standard nozzle further enhances the measurement function, integrating flow rate, temperature, and wide lead pressure monitoring. It can also automatically compensate for the effects of temperature and pressure, reflecting the intelligent characteristics of the new generation of flow meters. It adopts advanced microcomputer technology and micro power consumption technology, making the device powerful in function, compact in structure, easy to operate, and very convenient to use, greatly improving work efficiency and accuracy.
2. Installation direction of long neck nozzle flowmeter
The long neck nozzle flowmeter must be installed vertically, with a flow direction from bottom to top.
. This is determined by its measurement
2. Why must it be installed vertically? * Evacuation requirement: The throat of the long neck nozzle is very long. Installing it vertically and maintaining a bottom-up flow direction can ensure that the fluid fills the entire measuring tube section and smoothly carries out any bubbles that may be trapped, avoiding accumulation at the throat.
. Bubble accumulation and dispersion can seriously affect measurement accuracy. *Structural symmetry: Its design is based on a completely symmetrical flow field, and vertical installation can best ensure the axial symmetry of fluid flow and meet the standard requirements for outflow coefficient. *Standard regulations: The international standard ISO 5167 and the national standard GB/T 2624 both specify the vertical installation requirements for long neck nozzles, which are the legal and technical basis for ensuring their metrological performance. 3. The consequences of incorrect installation: If installed horizontally or in the wrong direction (from top to bottom), it can lead to: * Measurement inaccuracy: Gas or impurities are easily trapped in the throat, causing the flow measurement value to deviate significantly from the true value. *Equipment damage: Unnec