Patent ID: 8393051

Claim:
A device comprising a generator for in situ descaling an element body covered in a deposit, and present in a wet cooling tower, by generating at least one air blast of large quantity and low pressure by means of the generator causing a mass of compressed air to expand towards a zone of the element so as to create a flow in said element that is substantially parallel to the surfaces of walls constituting it, the generator being open at a distance (H) from said zone, and said operation being repeated after moving the generator along the element, wherein the generator comprises: a source of compressed gas; at least one tank having an inlet communicating with said gas source through a cock with controlled opening and closing, and an outlet communicating with the outside atmosphere via the seat of a valve member with controlled opening and closing; and control means for controlling the cock and the valve member to isolate the tank from the outside atmosphere while it is in communication with the compressed gas source, and for isolating it from the source when it is open to the outside atmosphere; wherein the valve member is mounted to slide on a stationary rod inside the tank and co-operates with said rod to define a variable-volume chamber suitable for being connected selectively to the compressed gas source and to the atmosphere for the purpose respectively of closing and opening the outlet of the tank.