Saw off a suitable length of seamless steel pipe and remove burrs at the ports. The end face of the pipe should be perpendicular to the axis, and the angle tolerance should not be greater than 0.53. If the pipe needs to be bent, the length of the straight line from the end face of the pipe to the bending part should not be less than three times the length of the nut; put the nut and the ferrule on the seamless steel pipe. Pay attention to the direction of the nut and the ferrule, do not install it in reverse; apply lubricating oil to the thread and ferrule of the pre-assembled joint body, insert the pipe into the joint body, (the pipe must be inserted to the end) and tighten the nut by hand.
Tighten the nut until the ferrule catches the tube, this turning point can be felt by the increase in tightening torque (pressure point); after reaching the pressure point, tighten the compression nut by 1/2 turn; remove the pre-assembled joint body and check For the insertion of the edge of the ferrule, the visible raised band must fill the space on the end face of the ferrule. The ferrule can be rotated slightly, but cannot be moved axially; in the final installation, apply lubricating oil to the thread of the joint body in the actual installation, and screw the compression nut with it until the sensible tightening force increases. Then tighten 1 /2 turns are installed.
