ELECTROMAGNETIC VALVE Russian patent published in 2002 - IPC

FIELD: supplying of working fluid in pneumatic and hydraulic systems. SUBSTANCE: electromagnetic valve includes solenoid with central opening having winding surrounded along perimeter by sectional magnetic circuit. Valve unit is arranged in opening of solenoid and it has tubular body with inlet and outlet magnetic circuits mutually joined by means of non- -magnetic sleeve. Other ends of magnetic circuits are connected respectively with inlet and outlet branch pipes. Valve cavity is arranged inside valve unit, and valve member is placed inside said cavity. Valve is forced by means of elastic member through abutment to seat. Seat is placed on lengthwise cylindrical protrusion of inlet branch pipe. Radial gap is formed between cylindrical protrusion and tubular body. Annular armature is arranged in radial gap in such a way that cylindrical protrusion with seat is embraced by armature. Bushing having end wall and made of magnetically soft material is placed inside inlet magnetic circuit between seat and inlet branch pipe. Said end wall is provided with ducts for passing working fluid and with central opening. In opening valve is arranged in such a way that it protrudes outside end wall towards seat by value less than working stroke of armature. EFFECT: improved dynamic characteristics, enhanced limit strength and reliability, decreased mass and size of valve device. 4 cl, 3 dwg