FIELD: construction.
SUBSTANCE: device comprises a body, connected actuating mechanisms and a nozzle, with which a body of throttling stop valve is connected. In the valve body there are radial holes closed in the initial position, which may in the working position hydraulically connected the nozzle cavity with the units of the actuating mechanisms drive, for this purpose in the nozzle there is a longitudinal slot, along which a guide screw fixed in the valve body may move. At the same time the valve body is connected with the nozzle by means of a shear screw.
EFFECT: higher reliability of device operation in case of unauthorised pressure increases.
2 cl, 2 dwg
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