Abstract: In a safety closing device for gas pipe systems (1) with a valve (2) which is capable of being pressed against a valve seating (9) in a housing, especially a tubular housing, the valve (2), as a disc valve capable of being moved in the axial direction of the tubular housing (1), is movably supported against the force of a spring (5). The cross-section area of the valve head (7) is made smaller than the clear cross section of the housing (1) and is kept at a distance from the inner wall of the tubular housing, and, furthermore, the gas supply connection (20) is provided on the side of the valve head (7) facing away from the spring (5).