卡套连接  Bite Type Tube Fittings

1、 卡套连接概述  Bite Type Tube Fittings Instructions

1.1  卡套式管接头由三部分组成：接头体、卡套、螺母。当卡套和螺母套在钢管上插入接头体后，旋紧螺母时，卡套前端外侧与接头体锥面粘合，内刃均匀地咬入无缝钢管，形成有效密封，见图7。

       Bite tybe 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 adge of cutting ring, this is how sealing is achieved and results in internal ridge inside the tube. see Fig. 7 .

1.2  24°锥的W型柱端按DIN 3861 标准。卡套采用双刃卡套。

    The tube connection side of fitting is manufactured in accordance with standard: DIN 3861

1.3  通常情况接头体和螺母表面镀锌处理。接头使用的工作压力最高可达63MPa，无缝钢管外径最大为42mm。

        In general, body and nuts’ surface is plated zinc. Bite type fitting can be used in system with Max 63 MPa. The connection tube O. D. is Max. 42mm.

2、 卡套接头的装配 Bite Type Tube Fittings Assembly Instructions

2.1  安装  Assembly

       a) 锯下合适长度的无缝钢管，去除端口毛刺。管子端面要与轴线垂直，角度公差不大于0.5°。如果管子需要折弯，则从管子端面与弯曲部位的直线段长度不能少于三倍螺母长度。

       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 bend to the tube end may be 3 times height of the nut.

      b) 把螺母和卡套套在无缝钢管上。注意螺母和卡套的方向，不要装反了。

      Set a nut and cutting ring on the tube .Make sure the cutting ring and the nut are facing the fitting.

      c) 在预装配接头体螺纹和卡套上涂上润滑油，把管子插入接头体，（管子一定要插到底）用手旋紧螺母。

      Lubricate the pre-assembly fitting body threads and cutting ring .insert tu be end into fitting body until it is firmly seated on bottom (fitting shoulder) and hand-tighten the nut.

      d) 拧紧螺母直至卡套卡住管子，这个转折点可以通过拧紧力矩的增加感觉到（压力点）。

      Tighten nut until ferrule grips tube which is felt by a noticeab le increase in torque (in crease in force).

      e) 达到压力点后，再将压紧螺母拧紧1/2圈。

      Tighten nut 1/2 of a turn after increase in force.

      f) 将预装配接头体拆下，检查卡套刃边的嵌入情况，可见的突起带必须填满卡套端面的空间，卡套可以稍微旋转，但不能轴向推移。

      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 .bur should not be capble of axial displacement.

      g) 最终安装，将实际安装中的接头体的螺纹涂上润滑油、压紧螺母与之配合拧至可感觉到的拧紧力增加为止，接着再拧紧1/2圈安装完毕。

       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.

2.2  重复安装  Reassembly

      所有的卡套接头都可以多次重装，但要保证零件无损坏且清洁。

      ensure this, parts must be clean and free of defects.

      a) 把管子插入接头体直至卡套贴紧接头体内锥面，用手拧紧螺母。

      Insert the tube into fitting body until cutting ring seats firmly in the fitting and hand-tighten the nut.

      b) 用扳手拧紧螺母，直至拧紧力矩急剧增大，再拧紧1/4至1/2圈即可。

      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.

2.3  检查  Checking up the bite condition

     可拆下管子检查装配是否合乎要求：卡套端部的管子上应该有均匀的轻微凸起。卡套不能前后滑动，但允许有轻微转动。

     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 doesn’t mean wrong installation .The cutting ring shall be refitted once the nut is retightened.

2.4  泄漏原因  Leakage reason

      a) 管子没插到底。

      When the tube is not fully bottomed

      b) 螺母没有拧紧。

      When the nut is nut tightened enough

      c) 管子外表刮伤或管子不圆。

      When the tube is of scratches or oval

      d) 管子太硬

      When the tube is extremely hard.