Mechanical Flow Measurement Devices: Types and Advantages

Mechanical flow meter tools can be divided based on either mass flow analysis or volumetric flow measurement. The flow analysis tools can also be further divided based on their system of work. Here a list and a short description of generally used flow analysis tools are given.

Mechanical flow measurement devices

The piston flow meter 

It runs on the system of a piston oscillating within a casing of known mass. For each oscillation, a fixed volume of fluid moves over the piston casing. Through effects related to this piston, the mechanical flowmeter dial holds the number of piston oscillations. Thus, the total liquid passed over in a given time is known. This amount arranged by the time shows a volumetric flow rate. Piston flow meters are usually used for the domestic water usage analysis.

The oval gear flow meter 

It is another positive displacement kind of flow meter. This flow meter utilizes two or more oval gears configured to twist at right points to one another, creating a T shape. This method lets the order of two parts in the flow meter chamber ultimately be sealed from each other, much like parts in the oval gear type positive displacement pumps. Thus every revolution of the gear compares to a solid-fluid volume moving by the flow meter. Therefore, the meter’s flow rate and volume moving can be regulated by controlling the number of gear turns.

Rotameter or Variable area meter 

It consists of an upright tapered glass tube and is floating inside the tube. The composition of tapered tube and float is such that the development drives up the float inflow due to higher pressure and viscous forces, and the float is drawn down by force if the flow rate reduces. The device rotameter is calibrated to be used for a particular service, typically water or air.

Turbine flow meters 

Use a turbine wheel for the analysis of flow, as the name implies. This turbine wheel sent in the liquid flow path turns, helped by the liquid hitting the turbine blades. The rotation velocity equals the fluid rate going the turbine blades, and the flow meter is calibrated to hold the flow precisely. They are usually used in firewater systems and other liquid distribution methods.

Single jet flow meter and Paddlewheel flow meter 

Use a device related to turbine mechanical flow meters and comprises a single impeller wheel with spiral vanes affected by a single jet. For paddlewheel flow meters, the wheel edges are more petite in width than a single jet flow meter and are only partly predicted in the flow path.

A versatile jet flow meter 

It is related to a single jet flow meter besides that the flow is driven on the impeller blades from different points, thus hitting various points on the periphery of turbine blades. This composition reduces the wear on impeller blades.

Pelton wheel flow meter or Radial turbine flow meter

 It uses a radial turbine to turn the liquid flow into the velocity of turn for the turbine wheel, calibrated to hold the fluid rate and liquid flow.

Nutating disc flow meter 

This type is the most generally used mechanical flow meter to hold water supply flow speeds. It utilizes an eccentrically fixed disc that nutates or trembles when the liquid flow hits the plate. The tilted disc sets a case to let the fluid flow, which endures on one side of the wheel. Thus one turn of the disc meets the fixed amount that has moved by.


Thus, these are the types of mechanical flow meters with their working. These flow meters are highly used for both commercial and residential. These devices are made with superior quality and are highly advanced. Therefore, at proteus, you will get the most reliable instruments. 

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