FIELD: mechanical engineering. SUBSTANCE: device has flexible member, two- chamber cylinder with chambers constructed as bellows and central part between the chamber, clamp, and system for pressure control inside the bellows spaces. The spaces are separated from each other. The pressure control system is constructed as sources of high and low pressure, two hydraulic cylinders, and two three-position pneumatic distributors coupled with the cylinders. One of the pneumatic distributors is in communication with the source of high pressure, and the other one with the source of low pressure. EFFECT: enhanced quality of protection. 2 dwg
