Patent ID: 6619615
Filing Date: 2003-09-16
Classification: F16H,G05D,H01F

Abstract:
A proportional pressure control valve comprising:a valve housing (2) with inlet and outlet ports (4, 5, 6), a control element (7) with control surfaces (8, 9) for the opening and closing of port openings; an armature rod (8) aligned along an armature axis (9) and connected to the control element (7); a proportional magnet (3) having a magnet coil (2), a magnet core (0), and a magnet armature (1) connected to the armature rod (8) by a spring (20) to provide relative movement with respect thereto and the magnet armature is movable back and forth along the armature axis (9); a first position where the proportional magnet (3) exerts in an operational range (YMA) a nearly constant first proportional magnetic force (FMA) on the magnet armature to provide for the relative movement of the magnet armature along the armature axis (9); and a second position where the magnet armature (1) is located at a smallest axial distance to the magnet core (0) and a second magnetic holding force (FMH), is generated between the magnet armature (1) and the magnet core (0) which is greater than the first proportional magnetic force (FMA) in the operational range (YMA) of the proportional magnet (3), and the magnet armature (1), by means of the second magnetic holding force (FMH), is maintained in the second position.