AXIAL VALVE FOR CONTROLLING THE DIFFERENTIAL PRESSURE BETWEEN A DELIVERY BRANCH AND A RETURN BRANCH OF A HYDRAULIC CIRCUIT

摘要

Axial differential pressure regulating valve. The pressure on one side of the membrane (70;170;221,221a) is compared with the pressure on the other side plus the force of a spring (30;130). A tubular body (20;120;220) fixed to the membrane moves responsive to the comparison and get closer to or away from a fixed closure member (55;155). The force excerted by the spring can be adjusted by acting on a ring nut (80;180), which acts on pins going into the valve and acting on a abutment flange of the tubular body on which the spring is held.