Positive displacement flowmeter

Positive displacement flowmeters are used for accurate measurement of fluids, especially viscous liquids, and are divided into different types.

Piston model

Gear Flowmeter:

Ovale gear flowmeter

Helical gear flowmeter (used for high viscosity materials)

Axial Nutating disk model

Diaphragm or jumper flowmeter (used for city gases)

Rotatory Van