VALVE Russian patent published in 2006 - IPC F16K3/24 

FIELD: pipe fittings, in particular, valves equipped with electromagnetic drives and adapted for controlling flow velocities of working fluid streams in main pipelines, preferably high-pressure pipelines.

SUBSTANCE: valve has sleeve designed for at least reciprocating motion relative to insert, and body with annular seat hermetically located within body. Seat hermetically embraces part of insert side surface. Insert has embraced annular seat and first through opening used as valve outlet opening. Valve body has second opening used as inlet opening. Third opening has second sealing member inserted therein. Sealing member embraces part of drive bushing connected with drive providing at least reciprocating motion of drive bushing. The latter has first portion with constant cross section, second sealant positioned on surface of first portion, and second portion adapted for embracing third sealant and having constant inner cross section. Stem is attached to first end surface of insert. Third sealant is fixed on stem. Drive bushing is connected to sleeve through device for restricting transverse motion of drive bushing relative to sleeve. End surface of drive bushing at side of second portion and part of outer surface of sleeve bottom are made in the form of mutually conforming seat and edge providing sealed contact between end surface of bushing and sleeve bottom. Sleeve bottom has opening for flowing of working fluid from sleeve inner space into drive bushing inner space. Inner surface of sleeve side wall embracing insert in closed state of valve has constant inner cross section. Edge of sleeve side wall has shape corresponding to shape of annular seat and provides hermetic contacting with annular seat. Area of drive bushing section surface portion, restricted with inner edge of surface of wide part of drive bushing, is 0.9-1.1 the area of drive bushing section surface portion, restricted with outer edge of narrow part surface of drive bushing. Sleeve and drive bushing are adapted for simultaneous reciprocation on part of stroke of drive bushing.

EFFECT: enhanced reliability in operation of valve.

17 cl, 4 dwg