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扩口式管接头的工作原理，接管它一般为铜管或薄壁钢管，端都圹口角度为74。导套的内锥孔为66。装配时的拧紧力通过螺母转换成轴向压紧力，由导套传递给接管的扩口部分，使扩口锥面与接头体密封锥面之间获得接触比压。在起刚性密封的同时，起连接作用并承受由管内流体压力所产生的接头体与接管之间的轴向分力。
The principle of a flaring nipple is that it is generally a copper or thin-walled tube, with an Angle of 74 at either end. , the inner taper hole of guide sleeve is 66. During assembly, the tightening force is converted into axial compression force through the nut, which is transferred to the flanged part of the pipe by the guide sleeve, so that the contact pressure between the flanged cone and the sealing cone of the joint body can be obtained. At the same time of rigid sealing, the joint ACTS and bears the axial component force between the joint body and the pipe which is produced by the fluid pressure in the pipe.
由于扩口式管接头的密封性能依靠扩口锥面的几何精度和适当的装配拧紧力予以保证，因此难以实现高压密封，一般工作压力小于16MPa。扩口式管接头的种类和规格见GB5625.1-1985～GB5652-1985。
As the sealing performance of the flaring pipe joint is guaranteed by the geometric accuracy of the flaring cone and the appropriate assembly tightening force, it is difficult to achieve high pressure sealing, and the general working pressure is less than 16MPa. See gb5625.1-1985 ~ gb5652-1985 for the types and specifications of flanged pipe joints.
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