FIELD: machine building.
SUBSTANCE: invention relates to a pipe fitting and is intended to serve in emergency operation systems and components of a large unit capacity with high energy parameters. Flow part of a safety device is shaped as a nozzle. In inlet pipe 2 there is a tapered portion of nozzle. In outlet pipe 3 there is an expanding portion of nozzle. In bulb stopper 4 there is a minimum nozzle section with diameter equal to calculated diameter of passage section of tap. Return device is integrated with a piston drive in one power cylinder 7 of double action. Working chamber 8 and working cavity 9 of return device are linked via through-channel 12 in differential piston 6 and connected with reset through pulse safety valve 14.
EFFECT: higher efficiency of protection of secure facility.
4 cl, 5 dwg
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