THREE-WAY ELECTROMAGNETIC VALVE AND ELECTROMAGNETIC VALVE FOR IT Russian patent published in 2000 - IPC

FIELD: liquid- or gas- flow control. SUBSTANCE: valves are used in hydraulic or pneumatic systems. Three-way electromagnetic valve has working medium inlet channel, channel of working medium outlet to system, actuating mechanisms, and atmospheric outlet channel. It also has body with gate seat contacting corresponding reciprocal sealing surfaces of cut-off member pressed to seat by working medium pressure and by flexible member, for example, spring. Spring is positioned coaxially with cut-off member tail-piece. With one end spring rests on cut-off member end and with the other, on internal surface of cover. Cover represents gate closing chamber which brings working medium under cut-off member end. It is installed with its sealing surfaces on sealing surfaces of body. Normally-open electromagnetic valve is positioned with its sealing surfaces on sealing surfaces of body, axially with gate and is coupled to cut-off member by means of rod. Gate is essentially two pairs of simultaneously contacting metal surfaces with microrelief in form of successively alternating projections and hollows on sealing surfaces of at least one pair. Electromagnetic valve has magnetic core consisting of magnetoconducting bushing with flanges between which electromagnetic winding placed on magnetic core bushing is arranged. Winding is closed by magnetoconducting casing conjugated with surfaces of flanges. Magnetic core bushing is divided by diamagnetic circular spacer which shuts off magnetic flux. Spacer is positioned opposite to zone of closing of magnetic flux of magnetic core bushing and armature. Armature is mounted in bushing through hole for axial displacement. From one side it is limited by stop secured in one of flanges and provided with working medium outlet channel, and from the other side it rests with its end on rod passing through hole in other flange and interacting with cut-off member of gate. The above-indicated end is provided with metal sealing surface which contacts reciprocal metal sealing surface of magnetic core bushing seat during operation. Electromagnetic valve is provided with mechanism of relative reciprocal turning through some angle, when loaded, positioned between armature end facing the stop and stop itself. In this case, rod and cut-off member are coupled to each other for relative longitudinal displacement but without capability to perform relative reciprocal turning. Flexible member, for example spring, is placed between rod and cut-off member. Given valves provide for high external and internal tightness, and they have extended service life. EFFECT: enhanced reliability. 36 cl, 33 dwg