BY-PASS VALVE Russian patent published in 1999 - IPC

FIELD: by-pass valves for connection with line and by-passing part of liquid flowing in line when liquid pressure increases its adjusted value. SUBSTANCE: by-pass valve includes housing provided with two openings for connection with line, through duct between them and chamber having inlet and outlet openings. Inlet opening joins chamber with outlet duct. Stem with shut-off organ on its one end is passed through opening of guiding member. Stem is mounted with possibility of sliding motion between opened and closed positions. In opened position shut-off organ is raised relative to inlet opening of chamber and chamber is communicated with through duct. In closed position inlet opening is closed by shut-off organ, chamber and through duct are mutually disconnected. Stem is spring-loaded for providing its motion to closed position at liquid pressure less than adjusted one. At closed position surface of shut-off organ senses action of liquid from through duct. Said surface is arranged in chamber and spaced from inner wall of through duct by distance no more than half-diameter of through duct. Invention offers different variants of valve structure. In all variants deposit of by-passed product is minimum and valve may be easily washed. EFFECT: improved design. 14 cl, 2 dwg