Installation method of ferrule joint

Installation method of ferrule joint (valve and joint)

(1) saw off the seamless steel pipe with appropriate size, and the tolerance of the vertical angle between the end face and the axis of the pipe shall not be greater than 0.5. Reverse 0.2 × 45 crevasse, the nozzle should be polished smooth, and the surface should be free of burr and concave convex surface. When bending the steel pipe, the length of the straight section from the end face of the pipe to the bending part shall be greater than twice the length of the nut.

(2) apply lubricating oil on the thread of the joint body and the ferrule, and apply evenly (do not stick to the conical surface of the ferrule joint), and then screw the nut repeatedly by hand, so that the lubricating oil is evenly applied on the thread of the nut.

(3) put the nut and sleeve on the seamless steel pipe. The direction of the sleeve should not be reversed. Insert the pipe into the joint body (the pipe must be inserted to the end) and tighten the nut.

(4) tighten the nut evenly with one hand wrench to the point of torque surge.

(5) after reaching the pressure point, tighten the nut 1 / 2 turn. Pay attention not to rotate the steel pipe when tightening the nut.

(6) allowance should be left for pre installation (double ferrule joint does not need to be pre installed), so that the ferrule cannot be fully embedded into the pipe, causing tensile stress to the pipe. Remove the pre tightening nut, and check whether the steel pipe has formed a protrusion at the front end of the ferrule, and the front end of the ferrule has been wrapped more than 50%. The ferrule can rotate slightly, but cannot be pushed axially.

(7) complete the installation, screw the nut to the torque surge point, and then tighten about 1 / 4 turn to complete the installation