What types of flowmeters create pressure conditions in a pipe to measure the flow?

Flow nozzles, flow tubes, orifice plates, and Venturi meters are types of flowmeters that create pressure differentials in a pipe to measure fluid flow. These devices function based on the principle of fluid dynamics, specifically that when a fluid passes through a constriction, the pressure decreases while the velocity increases.

Each of these flowmeters operates by narrowing the path of the fluid, creating a measurable pressure drop. For instance, in an orifice plate, fluid is forced through a small opening, generating a pressure difference that can be translated into a flow rate using Bernoulli's equation. Similarly, Venturi meters use a converging-diverging design to measure how changes in fluid speed affect pressure.

Using these types of flowmeters allows for accurate measurements of flow rates in pipelines, which is essential in various applications, including water treatment, chemical processing, and HVAC systems. This principle of creating pressure conditions is crucial in accurately assessing flow, which is why these devices are commonly used in industrial and municipal applications.