FIELD: maintenance of protective devices. SUBSTANCE: valves and similar automatic and mechanical protective devices usually fixed in position are apt to seize and, hence, cannot remain fully serviceable in emergency situations. Proposed system provides for real-time data for instance on serviceability of valve actuating mechanism. When trouble is detected, it can be confined with aid of common-use inspection tools. Valve is continuously held ready for use as unit actuating protective functions operates independently of serviceability check unit which is bypassed in emergency situations using special line. EFFECT: enhanced reliability. 5 cl, 3 dwg
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