Quick-fitting pipe coupling

Quick-fitting pipe coupling comprising a body adapted to be secured to a machine frame or like structure, a coupling member adapted to be fitted into said body, a locking member means secured to said body for locking said coupling member to said body, fluid passage means formed in said coupling member being bent at right angles in order to direct the fluid into said coupling perpendicularly to the direction of fitting of said coupling member in said body, said coupling member being adapted to be fitted into said body and comprising an inner member and locking means including a socket adapted to slide on said inner member, said socket opening the fluid passage means when said coupling member is fitted into said body and closing said passage when it is released therefrom, said locking member means including valve means interposed between a part of said body and said coupling member permitting the flow of fluid through itself when locking said coupling member in said body and permitting the release of said coupling member from said body only when said fluid passage means is blocked by said valve means, said fluid passage means comprising a pair of separate fluid circulation paths concentric to each other and to the longitudinal axis of said coupling member, each path communicating via a different port formed through the wall of said sliding socket with two series of superposed passages substantially parallel to each other, which superposed and parallel passages are formed in said body and said locking member means including said valve means, thus permitting simultaneous connection of double fluid circuits by using a single coupling member.