FIELD: oil and gas industry. SUBSTANCE: invention can be used also in operations related to transfer of fire-hazardous reagents over pipe- lines. Valve-shutoff device has body with central conduit. Body houses threading dies made of material with effect of shape storage, for instance, of nickel-titanium alloy that changes its shape to programmed one while temperature rises to temperature of change of shape of threading dies. With change of shape of threading dies central conduit is shut off. EFFECT: automatic operation of valve-shutoff device in case of fire in well-head or in installations of petrochemical or chemical industry. 2 dwg
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