HYDRAULIC SERVO VALVE

摘要

The invention relates to a hydraulic servo valve which is a hydraulic equipment for the proportional distribution of the working fluid, which can also operate at an adjustable frequency, by remote electronic control, intended to be used in accurate hydraulic drive systems, in particular automatically operated systems. According to the invention, the hydraulic servo valve comprises a body (1), closed by two covers (2 and 3), wherein there is a slide bushing (4) positioned between two springs (5.1 and 5.2), inside which there is a distribution valve (6) maintained in a balanced position by two other springs (7.1 and 7.2), which can be adjusted by a washer (8) and a tray (9), actuated by an adjusting screw (10) screwed into the cover (2), which can be fixed in its position by a nut (11) and protected by a cap (12), but which can be left-right displaced by a control pressure, controlled by a reduction piston (14) actuated by a proportional electromagnet (13), the pressure being distributed onto the end surfaces of the valve (6) by a reversing valve (16) actuated by a switching electromagnet (15), all of them being located within the cover (3), for the proportional distribution of a working fluid, from a pressure circuit to two other working circuits, successively, depending on the variation of a control electric current, the bushing (4) being also slidable to the left and right upon actuation by a rotary eccentric (18) reinforced by a bearing (19) and driven by an electric motor (17) of variable rotation speed, which are mounted within the body (1), with a view to distributing the same working fluid at adjustable frequency to the working circuits.