Abstract: The invention relates to a ball valve having a housing made of plastic in which a carrier structure is disposed that is encased in plastic in which a valve ball having a through opening is pivotally supported between an opening and closing position, said carrier structure comprising two carrier rings positioned opposite each other, and a connecting element connecting said carrier rings. In order to create a ball valve made of plastic that is characterized by a simple construction and improved impermeability, the invention provides for the carrier structure to separate the valve ball completely from the plastic of the housing.

Abstract: The invention relates to a ball valve having a housing made of plastic in which a carrier structure is disposed that is encased in plastic in which a valve ball having a through opening is pivotally supported between an opening and closing position, said carrier structure comprising two carrier rings positioned opposite each other, and a connecting element connecting said carrier rings. In order to create a ball valve made of plastic that is characterized by a simple construction and improved impermeability, the invention provides for the carrier structure to separate the valve ball completely from the plastic of the housing.

Abstract: The invention relates to a clamp made of thermally weldable material for pipes likewise composed of a weldable material, with two segments which enclose in the assembled state the entire circumference of the pipe and can be fixed to one another by mutually facing support surfaces, as well as a heating device provided with at least one heat conductor fixed to the inner surface of at least one segment. In order to provide a clamp of simple structure which ensures a tight connection with the pipe, it is proposed according to the invention, that the heating device in the assembled state is exclusively fixed to the inner surface of one segment only and that the heating device projects on both sides over the support surfaces of said segment in the direction of the other segment.