Differential valve fluid flow control device

摘要

The flow control valve for agricultural irrigation has a housing (3) defining a chamber (4) having an inlet (5), outlet (6) and a drain duct (7). The duct has a differential valve (2) with an obturator moved by a diaphragm (9), moved by an over pressure on one face. The diaphragm has a cut out in its centre. The upstream area of the face (11) around the opening engages on a seat (16). The downstream area of the face has a piston (17) forming part of the drain duct.