EMERGENCY CUTOFF FOR PIPE LINES Russian patent published in 1999 - IPC

FIELD: manufacture of fittings; automatic cutoff systems of passages excluding escape of explosion products; chemical and atomic industries. SUBSTANCE: trigger mechanism of cutoff member is located in separate gas chamber brought in communication with volume under control by means of pipe line. This mechanism includes hollow holder with circular bead on inner surface and collet movable in axial direction and connected with cutoff member by means of rod. Outer surfaces of collet lobes have projections for engagement with circular bead. Sensitive plate spring-loaded towards inlet hole of gas chamber is tightly fitted between lobes of collet. End of pipe line introduced into volume under control is provided with converging tube. Cutoff ensures shutting-off of pipe lines not directly connected with volume presenting hazard extending interval of permissible parameter of explosion accident towards lesser magnitudes. EFFECT: enhanced efficiency. 3 cl, 2 dwg