Turbine flowmeter, flowmeter, instrumentation, flow sensor
DLGB type throttling device (including orifice flowmeter and V cone flowmeter) is a differential pressure flow measuring instrument, mainly used for monitoring and controlling fluid flow in industrial pipelines. The following are their specific functions and characteristics:
1. The role of orifice flowmeter
Flow measurement: The flow rate is calculated (based on the Bernoulli equation) by the differential pressure signal generated when the fluid flows through the orifice plate, which is suitable for liquid, gas or steam.
Industrial application: It is widely used in petroleum, chemical, electric power and other industries, especially suitable for long-term monitoring of stable fluids.
Simple structure: standardized design (such as ISO 5167), low cost, but large pressure loss, accuracy of about ±1%~±2%.
Output signal: The differential pressure transmitter converts the signal into 4-20mA or digital output, supporting remote monitoring.
2. The role of V cone flowmeter
Flow measurement: The differential pressure is generated by V-shaped cone throttling. The measurement principle is similar to the orifice plate, but the flow field distribution is optimized.
Advantages and features:
Low maintenance: The cone structure reduces dirt accumulation and is suitable for impurities or viscous fluids (such as sewage and slurry).
Low pressure loss: The streamlined design reduces energy consumption and saves about 30%~50% energy compared to the orifice plate.
High precision: The range ratio can reach 10:1, and the accuracy is ±0.5%~±1.5%.
Application scenarios: High-demand working conditions in industries such as metallurgy, environmental protection (flue gas monitoring), and food.
3. Commonalities and selection suggestions between the two
Commonalities: Both require a differential pressure transmitter, are suitable for medium and high pressure pipelines, and have requirements for the length of the straight pipe section.
Selection basis:
Orifice: occasions with limited budget, clean media, and no frequent maintenance.
V-cone: scenarios with complex media, high energy-saving requirements, or a wider range ratio.