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『Circular orifice flowmeter』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)
1. Working Principle of Orifice Flow Meter Orifice Flow Meter Structure Orifice flow meters are widely used in various fields of the national economy, such as coal, chemical, transportation, construction, textile, food, medicine, agriculture, environmental protection, and peoples daily lives. They are important tools for developing industrial and agricultural production, saving energy, improving product quality, enhancing economic efficiency and management level, and occupy an important position in the national economy. So what is the working principle of orifice flowmeter? What are its structural characteristics? Lets continue looking down. The working principle of orifice flowmeter is a high range ratio differential pressure flow device composed of a standard orifice plate and a multi parameter differential pressure transmitter (or differential pressure transmitter, temperature transmitter, and pressure transmitter), which can measure the flow of gas, steam, liquid, and natural gas. It is widely used in program control and measurement in the fields of petroleum, chemical, metallurgy, power, heating, water supply, etc. Scope of application of orifice flowmeter: nominal diameter: 15 mm ≤ DN ≤ 1200mm nominal pressure: PN ≤ 10MPa working temperature: -50 ℃ hungry song ≤ t ≤ 550 ℃ range ratio: 1:10, 1:15 accuracy level 0.5, level 1 cross-sectional area shrinkage, the stable flow state is disrupted, so the flow rate will change, the speed will increase, and the static pressure of the gas will decrease accordingly, resulting in a pressure drop before and after the orifice plate, that is, a differential pressure relief valve (the pressure is higher in the area with a larger cross-section in front of the orifice plate, and 
1. Ring chamber pressure gauge standard orifice plate: belongs to the standard orifice plate. Due to the implementation of ring chamber pressure measurement, measurement accuracy has been improved and the minimum length of straight pipe segments required for installation has been shortened, making it widely applicable in various departments.
2、 Small caliber orifice plate: belongs to non-standard orifice plate. Used for measuring fluids within a diameter of 10mm to 50mm.
3、 Double orifice plate: It is composed of two standard orifice plates installed at a certain distance from each other in a straight pipe. In terms of the direction of the flow, the front orifice is referred to as the auxiliary orifice plate, while the rear orifice plate is referred to as the main orifice plate. The cross-sectional ratio m1 of the auxiliary orifice plate is greater than the cross-sectional ratio m of the main orifice plate. The two orifice plates form a nozzle with a liquid wall. It is used for flow measurement of low Reynolds number fluids or high viscosity fluids.
4、 Circular orifice plate: It belongs to non-standard orifice plates and is suitable for measuring the flow rate of fluids that are dirty, have air bubbles, or contain solid particles. Its measurement accuracy is relatively low.
5、 Conical inlet orifice plate: belongs to non-standard orifice plate. The angle between the circular cone and the centerline is 45 °. This conical inlet orifice plate is suitable for