Safety valve and tank

A safety valve (100), comprising:

• a valve body (1) with a guide bore (10) which defines a longitudinal axis (L1), a first opening (13) which is formed on a base (11) of the guide bore (10), and a second opening (15) which is formed at a distance to the base (11) along the longitudinal axis (L1) and which extends along a radial direction (R1) extending transversely to the longitudinal axis (L1);
• a valve needle (2) which is movably mounted in the guide bore (10) of the valve body (1) in an axial direction and which comprises a seal surface (2a) facing the first opening (13);
• a compression spring device (3) with a spring (30) that is compressed by a deflection (V) and thereby biases the valve needle (2) along the longitudinal axis (L1) into a seal position, in which the seal surface (2a) of the valve needle (2) seals the first opening (13);
• a thermally activatable trigger unit (4) which has an extension (14) along the longitudinal axis (L1), said extension being greater than the deflection (V), and which is designed to collapse when a trigger temperature is reached, wherein the compression spring device (3) is supported against the trigger unit (4);
• and
• a locking device (5) with a locking body (50) that is movably mounted in a locking recess (17) of the valve body (1) extending in the radial direction (R1) and a spring (51) which biases the locking body (50) in the radial direction (R1) towards the longitudinal axis (L1),
• wherein the second opening (15) of the valve body (1) is arranged in relation to the longitudinal axis (L1) between the locking recess (17) and the base (11),
• wherein the valve needle (2) comprises a locking groove (25), which is positioned in a seal position of the valve needle (2) between the locking recess (17) and the base (11) of the valve body (1) at a predetermined distance to the locking recess (17), and wherein the locking body (50) engages with the locking groove (25) in a lock position in which said body projects into the guide bore (10) when the valve needle (2) is retracted by the predetermined distance to the first opening (13).