FIELD: emergency protection systems of technological equipment. SUBSTANCE: discharge section is closed by flapping diaphragm. Holder is made in form of two rings with clamping surfaces made in form of bevels between which clamping edge of diaphragm is located. Angles of inclination of bevels and clamping edge relative to horizontal surface are equal. Clamping surface of ring located on convex side of diaphragm is elongated in ellipsoidal bevel at angle of adjoining the split plane, of holder which depends on angle of inclination of bevels. EFFECT: enhanced efficiency.
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