VALVE WITH ELECTROMAGNETIC DRIVE AND ELECTROMAGNETIC DRIVE FOR THIS VALVE Russian patent published in 2000 - IPC

FIELD: remote control of liquid or gas flows. SUBSTANCE: valve may be used in hydraulic and pneumatic systems. Valve with electromagnetic drive has body with inlet and outlet channels for passage of working medium and seat with sealing surfaces contacting reciprocal sealing surfaces of cut-off member pressed to seat by working medium pressure and flexible member, for example, by spring. Spring is positioned coaxially with cut-off member tail-piece. With its one end it rests on end of cut-off member and with the other, on internal surface of cover. Cover represents chamber closing gate and bringing working medium under end of cut-off member. Chamber is positioned with its sealing surfaces on sealing surfaces of body. Electromagnetic drive of valve is installed with its sealing surfaces on sealing surfaces of body axially with gate. It is coupled with cut-off member by means of rod. Gate is essentially two pairs of simultaneously contacting metal surfaces with microrelief in form of successively alternating circular projections and hollows on sealing surfaces of at least one pair. Electromagnetic drive for this valve has electromagnet in form of magnetic core which represents magnetoconducting bushing with flanges between which electromagnetic winding arranged on magnetic core bushing is positioned. Electromagnetic winding arranged on magnetic core bushing is positioned. Electromagnetic winding is closed by magnetoconducting casing conjugated with surfaces of flanges. Magnetic core bushing is divided by diamagnetic circular spacer cutting off magnetic flux of bushing and positioned opposite to closing zone of magnetic flux of magnetic core bushing and armature. Armature is mounted in through hole of bushing for axial displacement interacting from one side with cut-off member through rod fixed to armature. Rod passes through hole in one of flanges. From other side axial displacement of armature is limited by stop secured in other flange. Drive is provided with mechanism for relative reciprocal turning through some angle, when loaded. Mechanism is arranged between armature end facing the stop and stop itself. Rod and cut-off member are coupled to each other for relative longitudinal displacement but without relative reciprocal turning. Flexible member, for example, spring is installed between rod and cut-off member. Construction of valve and of its electromagnetic drive ensured high external and internal tightness of seals and extended service life. EFFECT: enhanced reliability. 26 cl, 24 dwg