Abstract: A quick opening and closing lid for pig chambers, with safety valve, includes a screw (6) with a needle type seal that traverses the two holes (5) in the clamps (3) and penetrates the hole (5) in the upper part of the mouth (2) of the pressure receptacle, thereby preventing the internal pressure from escaping and locking the clamps (3) that secure the lid (1) that seals the mouth (2). In order to open the pressure receptacle, screw (6) is unscrewed to allow the pressure to escape through the hole (5). With the receptacle depressurized, screw (6) is removed, thereby releasing the clamps (3) and consequently allowing the lid (1) to be opened.