| 摘要 |
<p>PROBLEM TO BE SOLVED: To eliminate energy of water pressure in a flow passage generated by water hammer so as to prevent the breakage of a valve element such as a flow passage and a water stop valve by constituting a fluid pipe main body by a soft resin made inner pipe and an outer pipe mounted outside of the inner pipe at prescribed intervals. SOLUTION: A flexible pipe 1 is formed as a double structure of an inner pipe 21 and an outer pipe 22, and the inner pipe 21 is composed of a soft resin made hose 210 and a helical spring 211 arranged along an inner wall of the hose 210 as a pipe diameter holding means. The outer pipe 22 is arranged for covering an outside of the inner pipe 21, and a cylindrical spacer 4 is arranged so as to interpose in one end side between the inner pipe 21 and the outer pipe 22. Since the inner pipe 21 is freely expanded, and pressure resistance property to pressure in a pipe body is not only arranged but also the pressure is absorbed and relieved. Even if very large pressure is generated in the pipe body by water hammer and the like, the inside of the flow passage is not broken by pressure.</p> |
