Anti-unscrewing device for ring nuts in coupling systems for tubes

A fluid conveying or delivery system comprising at least one coupling tubular end and an anti-unscrewing device for ring nuts joining tubular ends of two components in fluid conveying or delivery systems, wherein a ring nut can be screwed to one of the tubular ends in order to join said ends, wherein said anti-unscrewing device comprises:

• a. a connecting portion rotatably-fixed, and attached to a body portion, said connecting portion forming an articulating portion and a pawl;
• b. said articulating portion biasing said pawl into engagement with an engaging surface, wherein said articulating portion:
• i. allows the ring nut to be rotated in a first direction by positioning the pawl so that the engaging surface of the ring nut pushes the pawl out of engagement with the engaging surface when the ring nut is rotated in the first direction;
• and
• ii. prevents the ring nut from being rotated in a second direction by positioning the pawl so that the pawl engages the engaging surface of the ring nut when the ring nut is rotated in the second direction, and
• wherein said connecting portion rotatably-fixed is configured to rotate about a first axis of rotation and the ring nut is configured to rotate about a second axis of rotation, wherein the first axis of rotation and second axis of rotation are substantially perpendicular to each other.