About the Pre-Installation of Double Ferrule Joints
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- Pre-assembly is the most important part of the card sleeve joint, which directly affects the reliability of the seal. Generally, a special pre-assembler is required, and the joint with a small pipe diameter can be pre-assembled on a vise. The card sleeve type joint mainly includes a card sleeve type straight pipe joint, a card sleeve type straight through connector, a card sleeve type three-way pipe joint and other types. Even if it is a batch of goods from the same manufacturer, the depth of the tapered holes on these types of joint bodies is often different, resulting in leakage, and this problem is often ignored. The correct method is, what kind of joint body is used to connect one end of the pipe, and the corresponding connection end is pre-assembled with the same type of joint, so as to avoid the leakage problem to the greatest extent.
2. The end face of the pipe should be flush. After sawing the pipe, it should be polished 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-assembly, the coaxiality of the pipe and the joint body should be kept as much as possible. If the pipe is too skewed, the seal will fail.
4. The pre-assembly force should not be too large so that the inner blade of the ferrule just fits into the outer wall of the pipe, and the ferrule should not have obvious deformation. When the pipeline is connected, it is assembled according to the specified tightening force. The tightening force of ф6-1 card sleeve is 64-1 15n, 16фmmr 259n, 450n for ф18mm
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