Safety device for containers holding fluid under pressure

A safety device (1) for containers (2) holding fluid under pressure, each container having at least a upper component (3) and a bottom component (3) to be engaged with each other and defining an inner volume adapted to receive said fluid under pressure, said safety device comprising:

• a closing system (4) defining a closed position in which said components (3) are engaged together in a fluid-tight manner, and an open position in which they can be mutually moved and separated,
• a vent member (5) defining a closed position and a venting position of said fluid under pressure inside the container (2),
• at least one junction mechanism (14) to operatively connect the venting member (5) to the closing system (4), wherein the junction mechanism (14) is able to lock the closing system (4) to the closed position only when the vent member (5) is in the closed position;
• wherein the closing system (4) comprises at least two sealing elements (6), adapted to mutually seal both upper and bottom components (3) of the container (2), and an operating arm (8) designed to mutually engage and join together two sealing elements (6);
• and wherein said sealing elements (6) have the shape of half a ring so that, when two sealing elements (6) are joined together at protuberances (6a) on said sealing elements (6), and said sealing elements (6) are mounted on a rib (3a) that surrounds externally the whole circumference of the upper component (3) they achieve a close position of the container (2).