Positive displacement flow meters, also known as volumetric flow meters or PD flow meters, are considered the most accurate type of flow meters in the field of flow instrumentation. They operate by continuously dividing the fluid into discrete, known volume segments using mechanical measuring elements. The total volume of fluid is then measured by counting the number of times these segments are filled and discharged in the measuring chamber.
Based on the type of measuring elements used, positive displacement flow meters can be classified into various categories, including oval gear flow meters, scraper flow meters, dual-rotor flow meters, rotary piston flow meters, reciprocating piston flow meters, disc flow meters, liquid-sealed drum flow meters, wet gas meters, and membrane gas meters.
Advantages of positive displacement flow meters include:
1. High measurement accuracy.
2. Installation conditions do not significantly affect measurement accuracy.
3. Suitable for measuring high-viscosity fluids.
4. Wide range of measurement capabilities.
5. Direct-reading instruments do not require external power sources and provide clear and concise cumulative total readings, making them easy to operate.
Application overview:
Positive displacement flow meters, along with differential pressure flow meters and float flow meters, are among the most widely used types of flow meters. They are commonly employed for measuring the total quantity of expensive fluids such as oils and natural gases.
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