Patent ID: 8234938

Claim:
An arrangement for the automatic sampling in a storage tank system interconnected to a pipe system for supplying cleaning fluids, the storage tank system comprising several tanks and a sampling device that is respectively associated with all tanks via permanent pipework, wherein a feed valve and a return valve are respectively arranged on each tank in the lower region thereof and said feed and return valves are positioned at a certain distance from one another, are designed in a double-sealing fashion in their respective valve seat region, as well as in a mix-proof fashion, and feature valve seats that can be cleaned, wherein each of these feed and return valves features a through-housing with a first and a second connecting sleeve and a tank connection that is connected to the interior of the respectively assigned tank and can be switched by means of the assigned valve, wherein the storage tank system is respectively connected to the pipe system via a feed line and a return line, wherein the tanks are respectively connected to one another in series by means of the feed line extending through the respective connecting sleeves of the feed valves and by means of the return line extending through the respective connecting sleeves of the return valves, wherein the feed line and the return line are connected to one another by means of a sampling device on their end that lies opposite of the pipe system and form a closed circular pipeline, wherein one feed shut-off valve is respectively provided that is arranged in each first section of the feed line that is situated upstream of the feed valve referred to the flow direction, and wherein one return shut-off valve is respectively provided that is arranged in each second section of the return line that is situated downstream of the return valve referred to the flow direction.