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1. What is Positive Displacement Flow Metres and
Its Applications?

2. Positive displacement flow metres are devices used to measure the volume of fluid flowing
through a pipeline or channel by dividing it into measured segments. These metres are
among the most popular and accurate flow measurement devices in use today. Positive
displacement flow metres measure the quantity of fluid that flows through a pipe or duct by
dividing it into measurable units. This blog post will explore positive displacement flow metres
and their various applications.

3. What is Positive Displacement Flow?
Positive displacement flow refers to a type of flow where the volume of fluid that flows
through a pipe or channel is determined by the movement of a piston, gear, or other
mechanical component. As fluid moves through the metre, the movement of these
mechanical components creates measurable units of fluid, which can be counted to determine
the total volume of fluid that has flowed through the metre.

4. Types of Positive Displacement Flow Metres
There are several types of positive displacement flow metres. These include:
Piston Metres: Piston metres are widely used in the oil and gas industry for measuring the
flow of petroleum products such as crude oil, gasoline, and diesel fuel. They are also used in
the food and beverage industry for measuring the flow of liquids such as milk and fruit juices.
Piston metres are capable of measuring both high and low flow rates accurately, making them
ideal for applications where precise measurements are necessary. One of the key advantages
of piston metres is their ability to maintain accuracy over a wide range of flow rates. They are
also highly precise, with the ability to measure fluid flow within a very narrow range of
tolerance. Piston metres are durable and can withstand harsh operating conditions, including
high temperatures, pressure, and corrosive fluids.

5. Oval Gear Metres: Oval gear metres are commonly used in applications where high accuracy
is required. These types of flow metres have a simple design and can be used to measure a
wide range of fluids, including corrosive and viscous fluids. The gears in oval gear metres are
typically made of materials such as stainless steel, PTFE, or other suitable materials that can
withstand the properties of the fluid being measured. One of the advantages of oval gear
metres is their ability to maintain their accuracy over a wide range of flow rates, making them
ideal for measuring the flow of fluids that vary in viscosity. Oval gear metres are also capable
of measuring flow in both directions, which can be useful in some applications.

6. Nutating Disc Metres: Nutating disc metres use a disc that is mounted on a central ball that
is offset from the centre. As the fluid flows through the metre, the disc wobbles or nutates.
The wobbling motion of the disc creates a space between the disc and the metre body, which
varies in size with the flow rate. The volume of fluid that passes through the metre is
measured by counting the number of disc wobbles and multiplying it by the known volume of
each wobble. Nutating disc metres are highly accurate and can be used to measure a wide
range of fluids, including those with low viscosity. They are commonly used in industrial and
commercial applications where precise measurement is required.

7. Rotary Vane Metres: Rotary vane metres consist of a rotor with blades that rotate as fluid
flows through the metre. The blades are slightly offset, which creates a chamber for the fluid
to flow through. As the fluid passes through the chamber, it causes the rotor to rotate, which
in turn creates measurable units of fluid. Rotary vane metres are known for their high
accuracy and wide flow range. They are often used in applications where precision and
accuracy are critical, such as the measurement of fuels, chemicals, and food products. The
simple design of rotary vane metres also makes them easy to maintain and repair.

8. How Do Positive Displacement Flow Metres Work?
Positive displacement flow metres work by dividing the fluid flowing through a pipeline or
channel into measurable segments. As fluid moves through the metre, it creates mechanical
movement that is measured by the metre. The metre then records the number of segments
created and calculates the volume of fluid that has flowed through the metre.

9. What are the Applications of Flow Metre?
Positive displacement flow metres are used in a wide range of applications in various
industries, including:
Petroleum Industry: Positive displacement flow metres are commonly used in the
petroleum industry to measure the volume of crude oil, gasoline, and other petroleum
products flowing through pipelines.
Food and Beverage Industry: Positive displacement flow metres are used in the food and
beverage industry to measure the volume of liquid ingredients, such as milk, fruit juice, and
beer, that are used in the production of various food and beverage products.

10. Chemical Industry: Positive displacement flow metres are used in the chemical industry to
measure the volume of chemicals flowing through pipelines during the manufacturing
process.
Pharmaceutical Industry: Positive displacement flow metres are used in the
pharmaceutical industry to measure the volume of liquid ingredients used in the production of
various drugs and medications.

11. Conclusion
Positive displacement flow metres have proven to be an indispensable tool in various
industrial applications, including chemical processing, food and beverage production, and
pharmaceutical manufacturing, to name a few. The ability of these metres to accurately
measure and control fluid flow makes them crucial for ensuring product quality and
consistency as well as optimising production efficiency. As technology continues to advance,
we can expect to see more innovations in positive displacement flow metre design and
functionality, further expanding their applications and capabilities.
IDEX India is a trusted manufacturer of liquid handling solutions, including positive
displacement flow metres. With its commitment to quality, reliability, and innovation, IDEX
India has established itself as a leader in the fluid handling industry. Their positive
displacement flow metres are designed to meet the demanding needs of a wide range of
applications and industries, delivering accurate and precise flow measurement in even the
harshest operating conditions. Whether for industrial or commercial use, IDEX India's positive
displacement flow metres offer the accuracy, reliability, and durability needed for optimal
performance and productivity.

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