| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a union joint and the seal structure of union joint capable of obtaining an adequate sealing property with small torque. <P>SOLUTION: The union joint 1 includes: a union screw 2 having male thread part; a union flange 3 having a flange part; a union nut 4 having a female thread part which can be screwed to the male thread part of the union screw 2 and the flange part caught by the flange part of the union flange 3; and a packing 5 compressed between the seal surface 221 of the union screw 2 and the seal surface 321 of the union flange 3 which are formed between opposite surface parts of the union screw 2 and the union flange 3. A hollow part 6 which reduces the compression area of the packing 5 is disposed on at least one side seal surface of the seal surface 221 of the union screw 2 and the seal surface 321 of the union flange 3. Accordingly, contact area between the packing 5 and the seal surfaces 221, 321 can be reduced and surface pressure of the seal surfaces 221, 321 can be raised with small clamping torque. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
