Patent ID: 8185977

Claim:
A drain system for a vacuum toilet for an aircraft, the drain system comprising: a drain pipe system; a first closing device; and a second closing device; wherein the drain pipe system is provided with at least a first pipe section and a second pipe section that is connected to the first pipe section by way of a coupling; wherein a connection of the first pipe section is connectable to a bowl of a vacuum toilet, and a connection of the second pipe section is connectable to a vacuum system by way of the second closing device; wherein the first closing device is provided in the first pipe section; wherein the second closing device is provided in the second pipe section downstream of the first closing device; wherein the first closing device and the second closing device are coupled to each other such that in each instance only one of the first and the second closing devices can be open; and wherein liquids and any matter to be conveyed are conveyed from a bowl of a vacuum toilet behind the first closing device by way of the first pipe section right up to the second closing device only by way of the force of gravity when the second closing device is closed.