Scr device with valve arrangement

An SCR device for a motor vehicle, comprising a tank for storing an associated reducing liquid, in particular aqueous urea solution, an injection device for injection of the associated reducing liquid into an associated exhaust gas system of an associated motor vehicle, the SCR device having a liquid conduit for delivering the associated reducing liquid from the tank to the injection device, a feed pump for conveying the associated reducing liquid in the liquid conduit, and a valve arrangement in the liquid conduit, the valve arrangement being designed to interrupt an injection flow in the liquid conduit from the tank to the injection device when a tank-side pressure in the liquid conduit on a tank side of the valve arrangement is greater, in terms of amount, than an injection device-side pressure in the liquid conduit on an injection device side of the valve arrangement, by less than an injection threshold value, and to allow the injection flow to pass through when the tank-side pressure is greater, in terms of amount, than the injection device-side pressure, by at least the injection threshold value, the valve arrangement being designed to interrupt a return flow in the liquid conduit from the injection device to the tank when the injection device-side pressure is greater, in terms of amount, than the tank-side pressure in the liquid conduit, by less than a return threshold value, and to allow the return flow to pass through when the injection device-side pressure is greater, in terms of amount, than the tank-side pressure in the liquid conduit, by at least the return threshold value, the injection threshold value being greater in terms of amount than the return threshold value.