Quick disconnect coupling seal

Claim 1

A quick disconnect coupling for fueling apparatus used for supplying a space vehicle with a cryogenic liquid propellant, comprising a quick disconnect section of tubular configuration, a stationary section of tubular configuration for cooperative engagement with said quick disconnect section, said stationary section terminating at its mating end in a U-shaped configuration having axially extending radially spaced inner and outer legs with connecting wall means therebetween, concentric serrations disposed on the inner leg of the U-shaped terminal end of said stationary section, corresponding concentric serrations disposed on the mating end of said quick disconnect section, a primary seal of annular configuration positioned between and in sealing contact with the concentric serrations on said quick disconnect and said stationary sections, an elongated secondary seal extending axially outwardly from and in sealing contact with said connecting wall means, said secondary seal being bellows-shaped, a bobbin-type seal positioned between and in sealing contact with the outward end of said elongated secondary seal and the mating end of said quick disconnect section, said elongated secondary seal preventing escape of propellant that leaks past the primary seal, and locking means disposed on the sidewall of said quick disconnect section and said stationary section for retaining said stationary section in operational engagement therewith and sealing said sections by applying axial pressure therebetween to prevent leakage of propellant flowing through the sections to the space vehicle.