What is the function of each component in a positive displacement flow meter?

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Regardless of the type, positive displacement flowmeters have similar basic components. ① Measurement section: This is the main body of the flow meter, which includes a rotor as well as a metering chamber formed by the housing and cover plates. Under the action of the fluid, the rotor rotates continuously, and its rotation speed is proportional to the volume of fluid flowing through it. ② Sealed coupling: The speed of the rotor needs to be transmitted; during this transmission, it is necessary to ensure that no fluid leaks out, while also avoiding excessive resistance. There are usually two types of couplings: one is a magnetically sealed coupling, and the other is a mechanically sealed coupling. Since there is no leakage issue with magnetic coupling, magnetic seal couplings are generally used. ③ Governor: The rotor rotates at high speed, so a gear set is needed to reduce its speed in order to meet the requirements for reading and signaling. ④ Display section: This is the reading area of the flow meter, which usually includes either a pointer indication or a counter for counting. ⑤ Transmission section: The transmission section converts the flow signal of the medium under test into output pulses for long-distance transmission. The pulse can be a voltage pulse or a current pulse. However, if the flow meter only provides local display, it does not have this signaling section.

① Measurement section: This is the main body of the flow meter, which includes a rotor as well as a measurement chamber formed by the housing and cover plates. Under the action of the fluid, the rotor rotates continuously, and its rotational speed is proportional to the volume of fluid flowing through it. ② Sealed coupling: The speed of the rotor needs to be transmitted; during this transmission, it is necessary to ensure that no fluid leaks out, while also avoiding excessive resistance. There are usually two types of couplings: one is a magnetically sealed coupling, and the other is a mechanically sealed coupling. Since there is no leakage issue with magnetic coupling, magnetic-sealed couplings are generally used. ③ Governor: The rotor rotates at high speed, so a gear set is needed to reduce its speed in order to meet the requirements for reading and signaling. ④ Display section: This is the reading area of the flow meter, which usually includes either a pointer indication or a counter for counting. ⑤ Transmitting section: The transmitting section converts the flow signal of the medium under test into output pulses for remote transmission. The pulse can be a voltage pulse or a current pulse. However, if the flow meter only provides local display, then there is no such signaling section.

What was said upstairs is very good. How many types of positive displacement flow meters are there? Please list them; I’d like to learn from everyone as well. Rotary type must be one of them