Patent attributes
A quick disconnect coupler apparatus fluidly connecting coaxially aligned first and second couplings (50, 130), wherein the both couplings (50, 130) have an inner high pressure passage (26) and a coaxial outer lower pressure passage (53). Initially the first coupling inner high pressure passage (26) is fluidly connected with the first outer lower pressure passage (53) while isolating the second coupling inner high pressure passage (166) and the coaxial outer lower pressure passage (151). Then the first coupling inner high pressure passage (26) and one of the second coupling inner and outer passages (166, 151) is fluidly connected with the first coupling coaxial outer lower pressure passage (53) while isolating the other of the second coupling inner and outer passages (166, 151). Finally the first coupling inner high pressure passage (26) is fluidly connected with the second coupling inner high pressure passage (166) and the first coupling coaxial outer lower pressure passage (53) is fluidly connected with the second coupling coaxial outer lower pressure passage (151).
