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How to prevent leaks from ferrule joints
- 2019-07-02-
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      Sleeve Connector has a simple structure, Easy to use and no need to solder. However, in the medium and high pressure hydraulic system, if the operation is improper, it often forms a leak, which affects its implementation. After years of practice, I have summarized some experiences and got a better effect. (1) Pre-installation 1 Pre-assembly of the ferrule joint is a more important part, which directly affects the reliability of the seal. A pre-installer dedicated to general needs. The small diameter pipe joint can be pre-assembled on the vise. The specific method is to use a joint body as the mother body and press the nut and the ferrule onto the pipe. Firstly, there are ferrule-type straight-through pipe joints, ferrule-type straight-through heads, and ferrule-type three-way joints. We found that even for the same batch of the same manufacturer, the depth of the tapered holes on these joints is often different, and the result is a leak, and this problem is often overlooked. The correct approach should be to connect the connector at one end of the pipe, and the corresponding end is pre-assembled with the same type of joint, which can prevent leakage problems to a large extent. 2 The end faces of the tubes should be flush. After the pipe is sawn, it should be ground and smoothed on tools such as grinding wheels, and the burrs should be removed, cleaned and washed with high-pressure air. 3 When pre-installing, the coaxiality of the pipe and the joint body should be kept as much as possible. If the pipe is too skewed, the seal failure will be formed. 4 preloading force should not be too large. The inner edge of the ferrule should be inserted into the outer wall of the tube, and the ferrule should not be significantly deformed. When the pipe connection is made, the specified tightening force is assembled. If the ferrule becomes severe during pre-assembly, the seal will be lost. (2) It is prohibited to add a filler such as a sealant. In order to obtain a better sealing effect, a sealant is applied on the ferrule, and the result sealant is flushed into the liquid system to form a malfunction of the hydraulic component clogging. (3) When connecting the pipeline, the pipe should have a satisfactory deformation margin to prevent the pipe from being subjected to tensile stress. (4) When connecting the pipeline, it should be prevented from being subjected to the lateral force, and the lateral force is too large to form a tight seal. (5) When connecting the pipeline, it should be tight at one time to prevent repeated disassembly, otherwise the sealing function will be deteriorated.

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