Installation methods for high-pressure ball valves, quick connectors, and sleeve-type pipe fittings

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A bayonet tube joint consists of three parts: the joint body, the bayonet, and the nut. When the collet and nut are placed on the steel pipe and inserted into the joint body, and the nut is tightened, the outer side of the front end of the collet fits against the conical surface of the joint body, while its inner edge cuts evenly into the seamless steel pipe, thereby creating an effective seal. See Figure 2: Assembly of the socket joint. Installation: 1. Cut a seamless steel pipe to the appropriate length and remove the burrs from the ends. The end face of the steel pipe must be perpendicular to the axis, with an angular tolerance of no more than 0.5 degrees. If the steel pipe needs to be bent, the length of the straight section from the end face of the pipe to the bending point must be at least three times the length of the nut. 2. Put the nut and collar on the seamless steel pipe. Pay attention to the orientation of the nut and the collar; do not install them in the wrong direction. 3. Apply lubricant to the threads and collet of the pre-assembled joint body, insert the steel pipe into the joint body (make sure the pipe goes all the way in), and tighten the nut by hand. 4. Tighten the nut until the collet clamps around the steel pipe; this turning point can be felt through an increase in the tightening torque (the pressure point). 5. Once the pressure point is reached, tighten the nut another 1/2 turn. 6. Remove the pre-assembled joint body and check the seating of the collar’s cutting edge; any visible protrusions must fill the space at the front end of the collar. The collar can rotate slightly, but it cannot move axially. 7. For final installation, apply lubricant to the threads of the joint body during actual installation, tighten the nut in conjunction with it until an increase in tightening force can be felt, and then tighten it another 1/2 turn to complete the installation. Reinstallation: All ferrule connectors can be reinstalled multiple times, provided that the parts are undamaged and clean. 1. Insert the steel pipe into the joint body until the collar fits tightly against the conical surface inside the joint body, then tighten the nut by hand. 2. Use a wrench to tighten the nut until the tightening torque increases sharply, then turn it an additional 1/4 to 1/2 turn. Check: The steel pipe can be removed to verify that the assembly meets the requirements; there should be uniform, slight protrusions on the steel pipe at the end of the collar. The card sleeve cannot slide back and forth, but slight rotation is allowed. Reasons for leakage: 1. The steel pipe was not inserted far enough. 2. The nuts were not tightened properly. 3. The outer surface of the steel pipe is scratched or the pipe is not round. 4. The steel pipe is too hard