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What are the consequences if the flow rate through the manual metering valve exceeds the maximum flow rate of the valve? The word measurement can be understood as calibrating flow rate or daily measurement. There are multiple options based on the approximate range of gas flow rate and accuracy requirements: 1. Small flow rates below 1 L/min can be measured/calibrated using the most basic but accurate soap bubble flowmeter. It is particularly suitable for situations where the back pressure is zero. 2. There are different types of rotameters available for flow rates ranging from 0.01 to 100 L/min, and the accuracy is still acceptable. 3. Mass Flow Meter (MFM) is available for flow rates ranging from 0.01 to 1000 L/min, with high accuracy. 4. The flow rate ranges from 1-100 Nm3/h and can be measured using a critical Venturi nozzle (which is also one of the standard methods for measuring gas flow), with high accuracy. Standard English documents can be found online. 5. Larger industrial flow rates are measured using orifice pressure differential flow meters, vortex street flow meters, etc., with acceptable accuracy. Of course, the above traffic ranges are roughly divided. Based on the "steel cylinder" you mentioned earlier, I understand that you want to calibrate the flow curve of the measuring valve at different scales. I estimate that the flow rate should not exceed 200 L/min (at this flow rate, a 51 liter nitrogen cylinder can be emptied in 1 hour). A mass flow meter can be used to calibrate the measuring valve, and then the mass flow rate can be converted to a standard volumetric flow rate based on the gas composition and approximate molecular weight, according to the ideal gas equation. The advantage of using MFM calibration is that there is no need to worry about only changes in port pressure. It measures the molecular flow rate and has an automatic compensation function for pressure. Usually, metering valves have their own calibration curves, so sometimes you only need to calibrate a few points (such as 10, 50, 100% range) for flow verification. I dont know if my understanding of your question is correct. 2. The meaning of rotameter
rotameter means a rotating flow meter, also known as a rotor flow meter, flow meter, or float flow meter.
. The following is a detailed explanation about rotameter: Rotary flowmeter: This term emphasizes the working principle of a flowmeter, which is to measure flow by driving the rotor or float inside the flowmeter to rotate through the flow of fluid. Rotary flowmeter: Rotary flowmeter is another common term for a flowmeter, emphasizing the key component inside the flowmeter - the rotor, which is the core component for measuring flow rate. Flow meter: This is a broader term used to describe any device capable of measuring fluid flow. Rotameter, as a type of flowmeter, has specific working principles and structural characteristics. Float flowmeter: Float flowmeter is similar to rotor flowmeter, both relying on fluid flow to drive internal component movement to measure flow rate. In some cases, float flow meters and rotor flow meters can be used interchangeably. In summary, a rotameter is a device that measures flow by driving the internal rotor or float to rotate through fluid flow. It has various names, including rotary flowmeter, rotor flowmeter, flowmeter, and float flowmeter.