FIELD: gas and hydraulic lines; valves set into operation in case of trouble, for instance, when sealing of line is violated. SUBSTANCE: body of shutoff member is made streamlined and hollow, with holes over longitudinal axis for taking in surrounding pressure and accommodating springs. Springs are secured on partition and posts. Passage area between housing and shutoff member in initial position is constant and equal to passage area of main pipeline. EFFECT: improved reliability of operation. 2 dwg
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