rectangular flowmeter is a throttling component thatgenerates a differential pressure signal. The flow rate of the fluidcan be accurately measured according to the fluid mechanicsequation and based on the relationship between the differentialpressure signal and flow rate. The throttling block of a rectangularflowmeter has some characteristics of a wedge-shaped flowmeterthrottling wedge, as well as most characteristics of a venturiflowmeter. Generally speaking, the rectangular flowmeter is acombination of a wedge flowmeter and a venturi flowmeter.