FIELD: aircraft engineering. SUBSTANCE: bellows is connected to a cylindrical housing provided with suction and delivery branch pipes having valves. The bellows is connected to a pulse generator. The flexible members are coupled with the source of compressed gas and arranged at the ends of the housing between the bellows and fluid. The bellows is connected to the middle part of the housing. The branch pipes are connected to the middle part and to the ends of the housing. EFFECT: enhanced efficiency. 1 dwg
