Abstract: The method and apparatus relates to a procedure and an arrangement for minimizing the risk of the undesired escape of water from pipe systems and units connected thereto in premises and similar surroundings by the use of a control or valve arrangement arranged at the point of connection of the pipe system to the external supply pipe and capable of regulation by means of an adjuster device. A link is provided between the valve arrangement and the device for detecting the presence or movement of individuals inside the premises, and the operation is such that, in the event of the detection of presence or movement, the valve is kept open so as to permit water to enter the pipe system or network, whereas the valve is kept closed in the absence of such detection.