To provide a device and a method for generating a periodical impulse change in a flow of fluid without using a control valve or the like.

In the fluid technology, there are many cases, which require a flow of the pulsating fluid to be controlled by a control member with a large energy consumption. A device for automatically generating a periodical change of the impulse in a pressure pipeline 1 is provided with an elastic intermediate member 5, to which impulse is given by the control pressure p3, and this intermediate member 5 generates a pulsating flow Q' of the medium, and eliminates the use of a control member and a flap in this device. In the method for controlling this device, a required control pressure is eliminated from a bypass of a pressure pipeline. This device can be effectively used for various field related to the process engineering, besides the pneumatic technology.