Pre-installation ① An important part of the pre-installation of the ferrule type pipe joint directly affects the reliability of the seal. Dedicated preprocessors for common needs. Fittings with small diameters can be pre-assembled on a vise. The detailed method is to use a joint as the mother body, and press the nut and the ferrule onto the pipe. There are mainly ferrule-type straight-through pipe joints, ferrule-type end-through joints, and ferrule-type three-way pipe joints. The author found that even if it is a batch of goods from the same manufacturer, the depths of the conical holes on the joint bodies are often different, resulting in leakage, and this problem is often ignored. The correct way is to use what kind of joint body is used for connecting one end of the pipe, and the corresponding connecting end is pre-assembled with the same type of joint, which can minimize leakage problems. ②The end face of the pipe should be flush. After the pipe is cut off, it should be ground flush on the grinding wheel and other tools, and the burrs should be removed, cleaned and blown with high-pressure air before use. ③ During pre-installation, the coaxiality of the pipe and the joint body should be maintained as far as possible. If the deflection of the pipe is too large, the sealing failure will occur. ④ The preloading force should not be too large for the hydraulic quick joint, so that the inner edge of the ferrule is just embedded in the outer wall of the pipe, and the ferrule should not be significantly deformed. When the pipeline connection is stopped, assemble according to the specified tightening force. The tightening force of ф6-1 ferrule is 64-1 15n, 16фmmr 259n, and ф18mm is 450n. If the ferrule is seriously deformed during pre-installation, the sealing effect will be lost.
