FIELD: machine engineering.
SUBSTANCE: reverse acting rupture disc (10) having a laser-formed reversal initiation element (16) provided in the disc projecting portion (12). The reversal initiation element comprises at least the first laser-exposed region (22) which has reduced thickness relative to the remaining projecting portion. A second laser-exposed region (24) provided within the first laser-exposed region. The second laser-exposed region has depth less than the depth of the first laser-exposed region. Attenuation line (40) can be formed in the projecting portion which acts to direct the reversal of raised portion towards specific region of the disc, such as line (56) of the opening groove.
EFFECT: control and ordering of the extension shape in reversal.
40 cl, 12 dwg
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