BALL VALVE WITH TRIPLE SAFETY SYSTEM FOR EXPLOSIVE ENVIRONMENT Russian patent published in 2020 - IPC F16K17/38 F16K17/40 F16K5/06 

FIELD: machine building.

SUBSTANCE: invention relates to machine building, namely, to units and parts of means preventing accidental or spontaneous action, mainly to safety valves. Device comprises a housing with a ball plug with a passage orifice controlled by a spindle with a handle equipped with a lock designed to prevent accidental opening of the valve – the first element of the safety system. Second element is a shut-off valve with a spring-loaded gate, which is designed to prevent leakage of explosive atmosphere at pipeline rupture. Third element is a thermal shutoff valve with a spring-loaded pusher and a fusible insert designed so that to enable its fixation and prevention of explosive medium release. L-shaped handle is equipped with interlocking and fitted on spindle. To S-shaped bracket is attached to short flange of handle, attached on spindle between upper and lower nuts. Spring is installed between the upper nut and the long flange of the L-shaped handle. In the closed position of the valve the short flange of the handle is inserted into the blind groove made on the cylindrical protrusion of the case. Free end of S-shaped bracket is inserted into annular groove made on cylindrical protrusion of housing with possibility of turning bracket within angle of 90°. Second element of safety system – shut-off valve and third element – thermal shut-off valve are functionally combined, by means of movable installation of gate in hole of inlet bend of L-shaped through hole in ball plug, wherein shut-off valve gate is pressed by its spring to pusher of thermo-shut-off valve, screwed on one end made in form of pin fusible insert, other end of which is screwed into plug in housing, wherein between plug and pusher in its initial position with open gate is arranged in compressed form of spring, and axes of elements of shutoff and heat shutoff valves are aligned with longitudinal axis of spindle.

EFFECT: invention is aimed at reducing the time interval before the safety system operation in case of fire or pipeline rupture.

1 cl, 5 dwg