Break-away coupling with a triggered valve

Claim 1

IN A FLUID CONDUIT COUPLING ASSEMBLY, THE COMBINATION OF: A FIRST SUB-ASSEMBLY AND A SECOND SUB-ASSEMBLY, OF WHICH SUB-ASSEMBLIES BOTH ARE OF TUBULAR FORM WITH LATERAL WALLS AND ARRANGED IN SUBSTANTIALLY AXIAL MATED ALIGNMENT WITH CONTIGUOUS INNER ENDS AND AXIALLY REMOTE OUTER ENDS TO PROVIDE NORMALLY INTERCOMMUNICATING FLUID FLOW PASSAGES; A RADIALLY FLAT CONNECTIVE SHEAR SEAL RING OF FRANGIBLE MATERIAL INTERPOSED BETWEEN THE CONTIGUOUS ENDS OF SAID SUB-ASSEMBLIES; AND OUTER PAIR OF AXIALLY OPPOSED CLAMPING RINGS EMBRACING THE RADIALLY OUTER MARGINAL PORTION OF SAID CONNECTIVE SHEAR SEAL RING AND BEING SECURED IN HERMETICALLY SEALING MANNER TO THE LATERAL WALL OF ONE OF SAID SUB-ASSEMBLIES; AN INNER PAIR OF AXIALL OPPOSED CLAMPING RINGS EMBRACING THE RADIALLY INNER MARGINAL PORTION OF SAID CONNECTIVE SHEAR SEAL RING AND BEING SECURED IN HERMETICALLY SEALING MANNER TO THE LATERAL WALL OF THE OTHER OF SAID SUB-ASSEMBLIES; AND SHEAR SEAL RUPTURING MEANS RESPONSIVE TO AXIAL SEPARATION OF SAID SUBASSEMBLIES CONSTRUCTED AND ARRANGED TO CAUSE RUPTURE OF THE CONNECTIVE SHEAR SEAL RING PROGRESSIVELY AROUND THE CIRCUMFERENCE THEREOF FROM A STARTING POINT TO COMPLETION.