Orifice differential pressure flowmeter

The orifice plate differential pressure flowmeter can replace the orifice plate throttling device. The national standard specifies the standard orifice plate. If the fluid at the measuring point is dirty, a replaceable orifice throttling device is required. In this way, the throttling parts can be cleaned, repaired and replaced under the condition of non-stop gas flow. The typical structure of the replaceable orifice throttling device is shown in Fig. 3, 20. Round orifice plate. Segmented orifice plates are special orifice plates designed for flow measurement of dirty fluids. The opening is a part of a circle (circle segment), and the diameter of this circle is 98^ of the inner diameter of the pipe. The arc part of the opening should be precisely positioned so that it is concentric with the pipe, as shown in Figure 3.21. When the measured When the medium is wet gas and the pipeline is arranged horizontally, there may be a small amount of liquid flowing in layers at the bottom of the pipeline. At this time, the selection of the circular orifice plate can make the liquid pass through the throttle smoothly from the circular part of the lower half without being like The standard orifice blocks the liquid in front of the throttling part, resulting in liquid accumulation and affecting the measurement accuracy. Similarly, when the measured gas contains dust, because the dust density is much higher than that of the gas, some of the particles are easy to stick to the bottom of the pipeline If it is taken away by the air flow, the round orifice plate is selected, and the particles can pass through the throttling piece smoothly, and the particles will not accumulate in front of the throttling piece like the standard orifice plate. In the metallurgical industry, there are many measurement objects for gas flow, and because the gas flow It is also common to contain dust and water droplets, so the use of circular orifice plates is very common.

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