High-pressure resistant screw connection for pipe or hose lines with a tapered thread

A connecting device for pipe or hose lines, comprising

• a threaded connection body having a bore,
• an end piece which can be plugged into a receptacle provided at the front end of the threaded connection body, and
• a union nut for fixing the end piece in the threaded connection body, the union nut having an internal tapered thread such that the union nut can be screwed onto an external tapered thread on an outer circumference of the threaded connection body, and the union nut being rotatable on the threaded connection body between a release position and an installed position, and
• wherein the receptacle of the threaded connection body has an interior surface of progressively decreasing diameter and the end piece has a circumferential surface engaging into the receptacle, the circumferential surface having a progressively increasing diameter for engaging the interior surface of the receptacle,
• wherein the geometry of tooth flanks of the internal and external tapered threads is configured such that when the union nut is in the installed position determined by a predetermined tightening torque, the tooth flanks on opposite sides of the external tapered thread and corresponding tooth flanks of the internal tapered thread bear against one another over at least one turn of the external tapered thread;
• and
• wherein thread turns of the external tapered thread and the internal tapered thread have mutually different opening angles of the tooth flanks.

A connecting device for pipe or hose lines, comprising

• a threaded connection body having a bore,
• an end piece which can be plugged into a receptacle provided at the front end of the threaded connection body, and
• a union nut for fixing the end piece in the threaded connection body, the union nut having an internal tapered thread such that the union nut can be screwed onto an external tapered thread on an outer circumference of the threaded connection body, and the union nut being rotatable on the threaded connection body between a release position and an installed position, and
• wherein the receptacle of the threaded connection body has an interior surface of progressively decreasing diameter and the end piece has a circumferential surface engaging into the receptacle, the circumferential surface having a progressively increasing diameter for engaging the interior surface of the receptacle,
• wherein the geometry of tooth flanks of the internal and external tapered threads is configured such that when the union nut is in the installed position determined by a predetermined tightening torque, the tooth flanks on opposite sides of the external tapered thread and corresponding tooth flanks of the internal tapered thread bear against one another over at least one turn of the external tapered thread;
• and
• wherein the external tapered thread has an axial length larger than the internal tapered thread.

A connecting device for pipe or hose lines, comprising

• a threaded connection body having a bore,
• an end piece which can be plugged into a receptacle provided at the front end of the threaded connection body, and
• a union nut for fixing the end piece in the threaded connection body, the union nut having an internal tapered thread such that the union nut can be screwed onto an external tapered thread on an outer circumference of the threaded connection body, and the union nut being rotatable on the threaded connection body between a release position and an installed position, and
• wherein the receptacle of the threaded connection body has an interior surface of progressively decreasing diameter and the end piece has a circumferential surface engaging into the receptacle, the circumferential surface having a progressively increasing diameter for engaging the interior surface of the receptacle,
• wherein the geometry of tooth flanks of the internal and external tapered threads is configured such that when the union nut is in the installed position determined by a predetermined tightening torque, the tooth flanks on opposite sides of the external tapered thread and corresponding tooth flanks of the internal tapered thread bear against one another over at least one turn of the external tapered thread;
• wherein the internal and external tapered threads circumscribe the circumferential surface engaging into the receptacle, and
• wherein a groove with a seal arranged therein is provided in the internal surface of the receptacle.

A connecting device for pipe or hose lines, comprising

• a threaded connection body having a bore,
• an end piece which can be plugged into a receptacle provided at the front end of the threaded connection body, and
• a union nut for fixing the end piece in the threaded connection body, the union nut having an internal tapered thread such that the union nut can be screwed onto an external tapered thread on an outer circumference of the threaded connection body, and the union nut being rotatable on the threaded connection body between a release position and an installed position, and
• wherein the receptacle of the threaded connection body has an interior surface of progressively decreasing diameter and the end piece has a circumferential surface engaging into the receptacle, the circumferential surface having a progressively increasing diameter for engaging the interior surface of the receptacle,
• wherein the geometry of tooth flanks of the internal and external tapered threads is configured such that when the union nut is in the installed position determined by a predetermined tightening torque, the tooth flanks on opposite sides of the external tapered thread and corresponding tooth flanks of the internal tapered thread bear against one another over at least one turn of the external tapered thread;
• wherein the internal and external tapered threads circumscribe the circumferential surface engaging into the receptacle, and
• wherein the circumferential surface of the end piece extends axially beyond a leading axial end of the threaded connection body when the union nut is in the installed position determined by the predetermined tightening torque.