Abstract
The injection rate of a venturi depends upon its size and the difference between its upstream and downstream pressures. The performance of four commercially available venturies was evaluated under varying inlet and outlet pressure differentials. The injection rate was measured under the range of operating pressures from 1.0 to 2.0 kg/cm using normal irrigation water. Injection efficiencies of the venturies varied between 65 and 95 %. Maximum injection rate of one of the venturies was 108.2 Lph at the operating pressure of 2.0 kg/cm Decrease in upstream pressure or increase in down stream pressure decreased the injection rate, which was directly proportional to the venturi inlet and outlet pressure differential. No definite relation was, however, found between the injection rate and injection efficiency of the venturies.
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