Patent ID: 7168449

Claim:
A quick coupling for hydraulic fluid pipes, comprising: a male element and a female element whose ends which are to be connected are closed by first and second valves, respectively, each valve comprising a shut-off member which comes into bearing contact with the shut-off member of the other valve upon connection, each shut-off member being pressed by resilient means against a seat while the male element and female element are uncoupled, the female element comprising an outer tubular part fastened to the end of a pipe or to a hydraulic receiver and inside which is slidably mounted a tubular coupling part for coupling the male part, the tubular coupling part being slidably mounted in the outer part, in an insertion direction, against the action of coupling resilient means, seals being provided between the two tubular parts and delimiting annular chambers, wherein the tubular coupling part comprises the second valve and, in the region of a seal delimiting one of the annular chambers pressurized at the hydraulic pressure of the pipe or of the receiver to which the female element is fastened and one of the annular chambers pressurized at atmospheric pressure, at least one longitudinal slot formed in at least one of the tubular parts and positioned in such a way as to bring the annular chamber under hydraulic pressure into communication with the annular chamber at atmospheric pressure during the coupling phase, when the tubular coupling part is in the inserted position in the outer tubular part, and does not allow such a communication when the female element is in the coupled position or in the uncoupled position.