Which type of water meter has no moving parts?

The type of water meter that has no moving parts is the ultrasonic meter. This meter operates by using sound waves to measure the flow of water. It sends ultrasonic pulses through the water and measures the time it takes for these pulses to reflect back after bouncing off the water. Based on the time difference and the known speed of sound in water, it can accurately calculate the flow rate.

Ultrasonic meters offer advantages such as reduced wear and tear since there are no mechanical components that can degrade over time. This results in lower maintenance needs and longer service life. Additionally, the absence of moving parts allows for more accurate and reliable readings, as there is less chance of mechanical failure affecting performance.

In contrast, other types of meters like the Venturi meter and the positive displacement meter do rely on mechanical components to measure flow, which means they do have moving parts.