RELIEF VALVE WITH MAGNETIC FIXATION AND EMERGENT THROW OFF Russian patent published in 2008 - IPC F16K31/08 

FIELD: engines and pumps.

SUBSTANCE: invention relates to valves and accessories and can be used as a relief valve for liquid and gaseous working media. The valve has a body with a threaded cover, a spring-loaded shut-off element with a stem, a seat in the form of a branch pipe with a sealing cup arranged on the said pipe end face, a throttling plate, a spring, a guide bush made from non-magnetic material, the body crosswise partition, a magnetic system made up of two annular permanent magnets, a magnetic element, a magnetic conductor, a magnetic conducting washer. A washer is arranged between the magnets. The latter are fastened by bushes made from non-magnetic material in annular magnetic conductors. The said conductor inner cylindrical parts are furnished with tapered grooves. The lower annular magnetic conductor with the guide bush made from non-magnetic material is arranged inside the body so as to axially move and is spring-loaded to the cover via a sleeve from non-magnetic material. The upper annular magnetic conductor is formed by the cover and a threaded regulator screwed in the cover. The magnetic element is fitted on the magnetic conductor threaded bush. The throttling element is arranged at such a distance from the shut-off element that, with the latter seating on the valve seat, the distance from the branch pipe end face to the upper annular magnetic conductor equals the magnetic conducting washer travel to the upper annular magnetic conductor. A total travel of the shut-off element significantly exceeds the sum of the distance from the branch pipe end face to the throttling plate end face and the thickness of the said plate. The distance between the end faces of magnetic element and magnetic conducting washer is smaller than the distance between lower end faces of the annular magnetic conductors in a certain range.

EFFECT: smooth adjustment of working medium pressure difference, efficient protection against abrupt increase in working medium pressure, higher accuracy, reliability and efficiency.

1 dwg