Abstract: A plug-in safety coupling for pressure lines including a coupling socket (1) having a blocking member (3) pivotally mounted therein and a plug (2) insertable therein for pressureless coupling and uncoupling. The blocking member (3) is secured against pivotation at least in the flow position by means of at least one bolt or cam. The bolt or cam (67) is displaceably guided at the coupling socket (1), and in the blocking position engages into a bore or a recess in the blocking member (3). The blocking member (3) has a through bore extending perpendicularly to its pivotal axis into which an adapter (4) having a through bore, is insertable and fits tightly and sealingly and where an internal surface of the adapter (4) is shaped to receive the plug (2) to be inserted.

Abstract: A pluggable coupling for pressure lines having a female coupling connector and a male coupling connector. The female coupling connector has two axially aligned connecting bores with different diameters and an annular groove formed between a wall surrounding the larger bore and a nipple surrounding the smaller bore. The male connector can be inserted into the larger bore of the female coupling connector. In the process, the male coupling connector is pushed over the nipple. A sealing element is positioned within a circular male coupling groove of the male coupling connector and sealingly encloses a smooth exterior surface of the nipple. The male coupling connector can be connected and disconnected from the female coupling connector with a relatively small amount of force as compared to the force required to connect and disconnect conventional couplings.