Fluid system for circulation of fluid has closing device with closing piston moving freely reciprocally inside cylinder and subject to different pressures at endfaces

摘要

The fluid system has a closing device (10) with a closing piston (11) moving freely reciprocally inside a cylinder to close and open a fluid connection in the closed circuit on the basis of a control fluid supplied to it by a control valve. The piston is subject to different pressures at its endfaces, one of which is subject to working pressure and the other to control pressure.