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  The Correct Way For Tube Assembly Installing
  Usual Glossary In Steel Tube Norm
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   Site:Home >> Steel Tube >> Steel Tube Knowledge >> Ferrule Fitting Connection Fixing


一、Bite Type Tube Fittings Instructions

      
Bite type fitting consists of Three parts: body, cutting ring and nut. When tightening nut, cutting ring is driven forward on the tube then bites the tube with the edge of cutting ring, this is how sealing is achieved and results in internal ridge inside the tube. See Fig.

二、Bite Type Tube Fittings Assembly Instructions

Assembly

1、Cut the tube at right angle and de-burr inside and outside of tube end. Minimum straight length of tube from the starting point of tube bend to the tube end may be 3 times height of the nut.
2、Set a nut and cutting ring on the tube. Make sure the cutting ring and the nut are facing the fitting.
3、Lubricate the pre-assembly fitting body threads and cutting ring. Insert tube end into fitting body until it is firmly seated on bottom(fitting shoulder)and hand-tighten the nut.
4、Tighten nut until ferrule grips tube which is felt by a notice ab le increase in torque(in crease in force).
5、Tighten nut 1/2 of a turn after increase in force.
6、Disassembly the pre-assembly fitting body. Check penetration of cutting edge. A visible ring of material should fill the space in front of the profile ring end face. Profile ring may turn on tube, but should not be capable of axial displacement.
7、Lubricate the fitting body to be subsequently installed. Tighten nut until a noticeable increase in force is required. Tighten nut by 1/2 of a turn beyond this point for final assembly.

Reassembly

Fitting can be used many times. To ensure this, parts must be clean and free of defects.
1、Insert the tube into fitting body until cutting ring seats firmly in the fitting and hand-tighten the nut.
2、Tighten the nut with a wrench by holding the fitting body with a backup wrench until a sharp rise in torque is felt. Further tighten the nut 1/4 to 1/2 turn.

Checking up the bite condition

All bite type fitting must be disassembled prior to service to check up if small ridge inside the tube is completely formed around front edge of cutting ring .Otherwise tighten slightly more to have it.
Cutting ring may rotate on the tube that does not mean wrong installation. The cutting ring shall be refitted once the nut is retightened.

Leakage reason
1、When the tube is not fully bottomed
2、When the nut is not tightened enough
3、When the tube is of scratches or oval
4、When the tube is extremely hard

 
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