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 and 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 sectional body with seal along line of joint, two electromagnetic valves mounted in body in opposition to each other for separation of working medium inlet and outlet channels, with gates formed by armatures and magnetic cores. Electromagnetic valves are positioned in parallel to each other. Armature of first electromagnetic valve separating working medium inlet channel from cavity coupled with working medium outlet to system contacts one of ends of L-shaped pusher with working medium passage channels. With other end it interacts with second pusher fixed on armature end of second electromagnetic valve separating cavity with working medium outlet to system from drain outlet channel. Electromagnetic valve includes magnetic core which represents magnetoconducting bushing with flanges between which electromagnetic winding placed 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 which shuts off magnetic flux of bushing and is installed opposite to closing zone of magnetic flux of magnetic core bushing and armature. Armature is positioned in through hole of bushing for axial displacement. It is provided with working medium passage channel. Armature end is fitted with metal sealing surface which contacts reciprocal metal sealing surface of magnetic core bushing seat during operation. These metal surfaces form gate which is essentially two pairs of simultaneously contacting sealing surfaces with microrelief in form of successively alternating circular projections and hollows on sealing surface of at least one pair. As a result, stable and unique position of armature on sealing surfaces of magnetic core bushing seat and improved sealing are obtained. EFFECT: enhanced reliability of operation. 12 cl, 12 dwg