PRESSURE FITTINGS, SUCH AS PRESSURE RELIEF VALVE AND PRESSURE PROTECTIVE VALVE (VERSIONS) Russian patent published in 2000 - IPC

FIELD: pressure fittings. SUBSTANCE: pressure fitting 1 has flow passage 42, valve 5, shifting member 43 and gripping device 12. Shifting member 43 is movable along main axis 41 of pressure fitting 1. Valve 5 is fitted on end 44 of shifting member 43. Flow passage 42 is closed due to valve 5; gripping device 12 may be shifted to entrapping position; this device grips valve 5 and/or shifting member 43 at position of cone of valve 5 opening flow passage 42 and keeps valve 5 in position opening flow passage 42, thus relieving the pressure from system, for example, reactor pressure maintaining device cooled by water under pressure, including state at zero pressure. EFFECT: enhanced efficiency. 12 cl, 4 dwg