Drinking and domestic water system and shut-off valve for the same

Drinking and domestic water system with a transfer point (22) from a public water supply network, a line (2, 4) from which at least one ring main (10;

• 38, 40) provided with at least one consumer (12) branches off, wherein the ring main (10) branches off from the line (2, 4) via an outlet opening (14) and is led back into the line (2, 4) via an inlet opening (16), wherein the line (2, 4) and the ring main (10) are led in parallel and a flow resistance element (36) is arranged in the line (2, 4) between the outlet opening (14) and the inlet opening (16), or wherein the ring main (38, 40) is led back into a circulation line (6) via the inlet opening (16), wherein a single shut-off valve (18, 20) which has an actuator (44) and is arranged between the outlet opening (14) or the inlet opening (16) and the ring main (10) provided with the at least one consumer (12), and wherein the outlet opening (14), the inlet opening (16) and the ring main (10) are connected to said single shut-off valve.