the invention concerns a coupling for connecting hydraulic lines having a first coupling part 1 with a first valve 6 , which is received into a housing 3 , and including means for receiving a second coupling part 2 , which includes a second valve 64 . the truncated conical valve body 30 of first valve 6 is urged in the closing direction by a separate closing spring 33 . valve body 30 of first valve 6 is then penetrated by an actuator , which is adjustable in the direction of second valve 64 , and which actsacross an actuating surface cooperatively with an actuating shaft 7 disposed diagonally to the valve axis and penetrates housing 3 of first coupling part 1 , which actuating surface , on the one hand , acts on valve body 30 of first valve 6 and , on the other hand , on an actuator 35 . the actuator 35 is urged toward actuating surface 22 by means of an opening spring 37 supported by valve body 30 . in order to attain a simplified assembly , the actuating surface is part of a separate actuating member 18 , which is attached non - rotatably to an actuating shaft 7 , which is divided into two partial shaft pieces 8 , 9 .