VY

The vortex flowmeter operates based on the principle of the Kármán vortex street. When fluid flows past a bluff body (such as a triangular prism) inside a pipe, vortices are alternately formed on both downstream sides, creating a regular vortex street. The vortex frequency (f) is proportional to the flow velocity (v), with the relationship expressed as f = St·v/d (where St is the Strouhal number and d is the width of the bluff body). Sensors (such as piezoelectric elements) detect the vortex frequency and convert it into an electrical signal, and the flow rate Q is calculated through the instrument coefficient K (determined via calibration) as Q = f/K. This type of flowmeter is suitable for gases, steam, and liquids.

New model

Yokogawa Electric's VY series vortex flowmeters are developed using two key technologies: digital technology and the unique structure inherited from the YEWFLO series. Status information is recorded in the instrument, making it easier to determine when maintenance is required. Maintenance activities, such as flowmeter cleaning or component replacement, are performed based on the condition of the instrument, and these features contribute to more efficient and planned plant operations.