| 摘要 |
PURPOSE:To prevent a crack from occurring and growing up, by processing an inner wall of a tapering type projection part directing its vertical angle outward coherently tight into nonpenetration of a fluid, while pressing and locking it tight enough with a clamping metal device. CONSTITUTION:A projection part A is formed in a pressure-pinching part for controlling a fluid flowing inside a circular tube body. This projection part, making the inner wall side the base 1d, is of an acute-angle triangle form having a vertical angle 1e, and installed symmetrically pairwise on a horizontal axis. An inner wall 1c of the projection part A, after being coated with a bonding agent suitable for a tube material, is pressurized by a press and coherently processed tight enough. Proper roundness is provided for a tip end of the inner wall of the vertical angle part 1e as well, and a sectional circular circular boss part 1b being fitted in a clamping metal device and pulling the tube is installed at the side of an outer wall in advance of the inner wall tip, doubling as crack growth prevention.
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