Flow control system for irrigation operation, has pressure evaluating unit at upstream area of depression zone to evaluate primary fluid pressure and depression device to generate depression zone through which primary fluid flows

摘要

The system has a depression device to generate a depression zone (7A) through which a primary fluid flows. A pressure evaluating unit (17) is arranged at an upstream area of the zone to evaluate the primary fluid pressure. An outlet (26) is connected to a supply line (10) to feed with the secondary fluid. An organ (29) directs the secondary fluid between an inlet and the outlet depending on difference between fluid pressures. The supply line connects the depression device to enable an entry of a secondary fluid (13, 14) at a downstream area of the depression zone.