Cavitating Venturis or Nozzles allow a liquid flowrate to be fixed or locked. ... The throat of a Cavitating Venturi is sized such that the differential pressure generated from the inlet section to the throat reduces the liquid's absolute pressure to its vapor pressure point and it starts to vaporize or boil.

Does a venturi restrict flow?

A conventional venturi carries with it penalties for aquatics systems. The constriction and its resulting backpressure can substantially reduce flow and burden the pump with unnecessary load increasing energy costs and shortening its serviceable life.

How can we prevent cavitation in Venturi meter?

Cavitation takes place as the liquid evaporates and the vapor condenses to a liquid and so on. To avoid cavitation, the pressure at the throat of a venturi meter has not to reach the value of vapor pressure of the flowing liquid.