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 drain outlet channel. It also has body with gate seat contacting 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 members by means of rod. Gate is essentially two pairs of simultaneously contacting metal surface 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 bushing 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. It is provided with channels for working medium passage made in form of flats, recesses or holes. From one side armature is limited by stop secured in one of flanges contacting with its sealing surfaces the reciprocal surfaces of bushing and having channel for working medium outlet. From the other side armature rests with its end on rod passing through hole in other flange and interacting with gate cut-off member. The above-indicated end is provided with metal sealing surface which contacts reciprocal metal sealing surface of magnetic core bushing seat during operation. Armature and bushing of magnetic core form gate. Given valves provide for high external and internal tightness and have extended service life. EFFECT: enhanced reliability. 31 cl, 28 dwg