What is this in the image below?
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As shown in the red area of the figure below, it appears to be related to a flow meter and its associated components; the legend indicates that it belongs to the \"positive displacement type\" category within the \"primary element symbol\" section. What exactly is this?
Positive displacement flow meter HG/T 20505 P36, Serial No. 23
1. Primary element symbol: Positive displacement type (positive-displacement flow meter). 2. FQ: Flow accumulation. 3. LXV: Level interlock valve
Positive displacement flow meters with accumulation function, gear flow meters
A flow meter is similar to a household water meter
The symbol in the pipeline represents a turbine flowmeter or rotor flowmeter; FQ denotes flow accumulation, that is, the display of the total flow volume.
Turbine flowmeter, with cumulative function required； Another one is a cut-off valve that is interlocked with the liquid level