Patent attributes
The invention relates to a safety shut-off device for sections of fluid circuits, which in case of damage or the like, have to shut off from each other on safety considerations. The safety shut-off device includes two chambers with connections for the sections to be shut off from each other. The chambers are separated from each other by a piston and have two connections each, of which one is closed by closing elements with sealing force elements, when both chambers have the same pressure. Further, two actuating devices are provided which are functionally connected to the closing elements and the piston. When the piston is moved due to a pressure difference between the connections, the closing element in the chamber with the higher pressure opens the associated connection so that fluid can flow from a section with higher pressure into the other section with lower pressure. The accompanying pressure increase in the section with the lower pressure ensures that the corresponding closing element of the chamber with the lower pressure is overcome by the fluid against the pressure of the sealing force element so that the fluid is capable to circulate in both sections.
