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Precautions for the installation of the ferrule joint, analysis of the cause of leakage of the ferrule joint
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Author:szokyy
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Published time: 2018-07-13
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First, the assembly of the ferrule type pipe joint
(1). Pre-installed
The most important part of the pre-assembly of the 1 ferrule fitting directly affects the reliability of the seal. A dedicated preloader is generally required. Joints with small pipe diameters can be pre-assembled on vise. The specific method is to use a joint as the mother body, and press the nut and the ferrule onto the tube. There are mainly types of sleeve-type straight-through pipe joints, ferrule-type end straight-through heads, and ferrule-type three-way pipe joints. The author found that even if the same manufacturer has a batch of goods, the depth of the tapered holes on these joints is often different, resulting in leakage, and this problem is often overlooked. The correct way to do this is to connect the connector at one end with the connector, and the corresponding connector is pre-assembled with the same type of connector to minimize leakage.
2 The end face of the pipe 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 before use.
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 will be invalid.
4 The pre-loading force should not be too large, so that the inner edge of the ferrule is just embedded in the outer wall of the pipe, and the ferrule should not be obviously deformed. When connecting the pipes, assemble them according to the specified tightening force. The tightening force of the ф6-1 ferrule is 64-1 15n, 16 фmmr 259n, and ф18mm is 450n. If the ferrule is severely deformed during pre-assembly, the sealing effect will be lost.
(2) It is forbidden to add fillers such as sealant. In order to obtain a better sealing effect, a sealant is applied to the ferrule, and as a result, the sealant is flushed into the hydraulic system, causing malfunctions such as clogging of the hydraulic component.
(3) When connecting the pipeline, the pipe should have sufficient deformation allowance to avoid the tensile force of the pipe.
(4) When connecting the pipeline, avoid the lateral force, and the lateral force is too large to cause the seal to be tight.
(5) When connecting the pipeline, it should be done once and avoid multiple disassembly, otherwise the sealing performance will be deteriorated. Card sleeve fitting installation
(1) Pipes requiring pickling shall be pickled prior to the requirements of Chapter 9;
(2) Cut the pipe with a saw or a special pipe cutter according to the required length. It is absolutely not allowed to use melt (such as flame cutting) or grinding wheel cutting; remove the inner and outer round burrs, metal chips and dirt at the pipe end; remove the rust of the pipe joint. Agent and dirt; at the same time ensure the roundness of the pipe;
(3) Insert the nut and the ferrule into the tube successively, and the front edge of the ferrule (small diameter end) is at least 3 mm away from the tube mouth, and then the tube is inserted into the taper hole of the joint body, and the top is up;
(4) Tighten the nut slowly, and while rotating the tube until it is not moving, tighten the nut 2/3~4/3 times;
(5) Disassemble the inspection ferrule if it has been cut into the pipe and the position is correct. The ferrule is not allowed to move axially and can be rotated slightly;
(6) Re-tighten the nut after passing the inspection. Second, the prevention of leakage at the pipe joints In the hydraulic system, whether it is a metal pipe joint or a hose joint, there is a problem that leakage is likely to occur. For the ferrule type pipe joint, most of the pipe is subjected to a large external force or impact force, causing the ferrule to loosen or the pipe end face to be deformed to cause leakage. At this time, it should be checked whether the ferrule is out of round, the cutting edge is defective, and the pipe end is The integrity and the compression of the ferrule nut, etc., while eliminating the external force of the pipe. For the flared pipe joints, most of them are caused by excessive flare, quality is not required or disassembled many times, causing leakage due to flaring deformation or cracks. At this time, the front end can be cut off and re-expanded. If the male and female cones are used for sealing, the leakage is mostly due to the damage of the two tapered surfaces, and the tapered surface can be ground with abrasive sand. In some cases where the "о" ring is sealed by the end face or the outer diameter, the leakage causes the following: "о" ring is aged or deformed to cause leakage; the "о" ring is not assembled, so that the two planes are connected. The pressure is not flat or the "о" ring is cut to cause leakage; the "о" ring is not compacted, and the amount of elastic deformation is insufficient to cause leakage; the "о" ring is too deep to cause leakage. In this regard, it is necessary to re-select the "о" ring with the same outer diameter and thick section, or cut or grind the sealing plane with the groove to reduce the depth of the groove, so that "о" The ring has sufficient elastic deformation (the compression should generally be between 0.35 and 0.65 mm). For the leakage of pipe joints with oil-resistant rubber sheets, wool felts, mild steel cardboard, combination sealing gaskets or sealants, no matter what material, first check the seals for damage, deformation, aging and roughness. And then take the appropriate measures.
(1). Pre-installed
The most important part of the pre-assembly of the 1 ferrule fitting directly affects the reliability of the seal. A dedicated preloader is generally required. Joints with small pipe diameters can be pre-assembled on vise. The specific method is to use a joint as the mother body, and press the nut and the ferrule onto the tube. There are mainly types of sleeve-type straight-through pipe joints, ferrule-type end straight-through heads, and ferrule-type three-way pipe joints. The author found that even if the same manufacturer has a batch of goods, the depth of the tapered holes on these joints is often different, resulting in leakage, and this problem is often overlooked. The correct way to do this is to connect the connector at one end with the connector, and the corresponding connector is pre-assembled with the same type of connector to minimize leakage.
2 The end face of the pipe 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 before use.
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 will be invalid.
4 The pre-loading force should not be too large, so that the inner edge of the ferrule is just embedded in the outer wall of the pipe, and the ferrule should not be obviously deformed. When connecting the pipes, assemble them according to the specified tightening force. The tightening force of the ф6-1 ferrule is 64-1 15n, 16 фmmr 259n, and ф18mm is 450n. If the ferrule is severely deformed during pre-assembly, the sealing effect will be lost.
(2) It is forbidden to add fillers such as sealant. In order to obtain a better sealing effect, a sealant is applied to the ferrule, and as a result, the sealant is flushed into the hydraulic system, causing malfunctions such as clogging of the hydraulic component.
(3) When connecting the pipeline, the pipe should have sufficient deformation allowance to avoid the tensile force of the pipe.
(4) When connecting the pipeline, avoid the lateral force, and the lateral force is too large to cause the seal to be tight.
(5) When connecting the pipeline, it should be done once and avoid multiple disassembly, otherwise the sealing performance will be deteriorated. Card sleeve fitting installation
(1) Pipes requiring pickling shall be pickled prior to the requirements of Chapter 9;
(2) Cut the pipe with a saw or a special pipe cutter according to the required length. It is absolutely not allowed to use melt (such as flame cutting) or grinding wheel cutting; remove the inner and outer round burrs, metal chips and dirt at the pipe end; remove the rust of the pipe joint. Agent and dirt; at the same time ensure the roundness of the pipe;
(3) Insert the nut and the ferrule into the tube successively, and the front edge of the ferrule (small diameter end) is at least 3 mm away from the tube mouth, and then the tube is inserted into the taper hole of the joint body, and the top is up;
(4) Tighten the nut slowly, and while rotating the tube until it is not moving, tighten the nut 2/3~4/3 times;
(5) Disassemble the inspection ferrule if it has been cut into the pipe and the position is correct. The ferrule is not allowed to move axially and can be rotated slightly;
(6) Re-tighten the nut after passing the inspection. Second, the prevention of leakage at the pipe joints In the hydraulic system, whether it is a metal pipe joint or a hose joint, there is a problem that leakage is likely to occur. For the ferrule type pipe joint, most of the pipe is subjected to a large external force or impact force, causing the ferrule to loosen or the pipe end face to be deformed to cause leakage. At this time, it should be checked whether the ferrule is out of round, the cutting edge is defective, and the pipe end is The integrity and the compression of the ferrule nut, etc., while eliminating the external force of the pipe. For the flared pipe joints, most of them are caused by excessive flare, quality is not required or disassembled many times, causing leakage due to flaring deformation or cracks. At this time, the front end can be cut off and re-expanded. If the male and female cones are used for sealing, the leakage is mostly due to the damage of the two tapered surfaces, and the tapered surface can be ground with abrasive sand. In some cases where the "о" ring is sealed by the end face or the outer diameter, the leakage causes the following: "о" ring is aged or deformed to cause leakage; the "о" ring is not assembled, so that the two planes are connected. The pressure is not flat or the "о" ring is cut to cause leakage; the "о" ring is not compacted, and the amount of elastic deformation is insufficient to cause leakage; the "о" ring is too deep to cause leakage. In this regard, it is necessary to re-select the "о" ring with the same outer diameter and thick section, or cut or grind the sealing plane with the groove to reduce the depth of the groove, so that "о" The ring has sufficient elastic deformation (the compression should generally be between 0.35 and 0.65 mm). For the leakage of pipe joints with oil-resistant rubber sheets, wool felts, mild steel cardboard, combination sealing gaskets or sealants, no matter what material, first check the seals for damage, deformation, aging and roughness. And then take the appropriate measures.
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