| 摘要 |
<p>The invention concerns an improved spiral piping for all fluids. The whorls (1a, 1b, 1c...) of the piping have the geometrical configuration of two straight lines joining two semicircles by their ends. The desired length of piping is taken from the length of coiled tube by cutting at the junction of a curved portion with a rectilinear portion, and has perfectly cylindrical ends capable of engaging in a fitting and of ensuring a fluid-tight connection.</p> |
