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Card nested tube connector widely used in oil, gas and corrosive media pipeline systems, working pressure up to 40MPa. It uses a unique set of cards to connect the principle of reasonable structure, easy to use, without expanding, without welding, does not require any special assembly tools. However, the previous single-card set of in-pipe joint, steel would have a card sleeve and non-elastic deformation, there is no flexibility in compensation and can not be repeated disassembly; threaded connections impact, vibration, poor function. Therefore, this issue cards in a single blade on the basis of sets of improvements: the use of card sets to the front edge seal from the role of stuck pipe, the occurrence of elastic deformation; card sets used to get stuck after the steel blade is not loose so that pipe, plastic deformation. Pressed nut and the joint between the screw thread connection with the transition to improve the impact resistance of the thread, the function of vibration. Card