FIELD: machine building.
SUBSTANCE: fail-safe unit of fixing plug for a high-speed safety locking device comprises return pin, a fixing plug connected to return pin in proximal part. Safety disc is connected to return pin in distal part. Fixing plug assembly is long to prevent falling off of safety disc from said distal part before safety disc comes into contact with a valve seat. Fixing plug assembly is also long to prevent falling of fixing plug from return pin before safety disc comes into contact with valve seat.
EFFECT: high reliability of fail-safe fixing plug assembly.
20 cl, 14 dwg
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