PTFE hmoov uas muaj kev ua tau zoo yog siv los thawb (squeeze) rau hauv cov yeeb nkab, qhov chaw yog tshuaj kho, thiab tom qab ntawd nws yog lined rau hauv seamless steel tube (qhov txoj kab uas hla ntawm lub liner yog me ntsis loj dua lub puab txoj kab uas hla ntawm lub raj steel 1.5. -2mm) los tsim ib lub seamless liner.Txhim kho qhov kev ntxhov siab, nws muab tso rau hauv lub cub tawg thiab rhuab mus rau 180 degrees rau qhov kub thiab txias, kom nws tsim nyog siv rau hauv qhov kub thiab txias hauv qab 180 degrees, tib lub sijhawm, lub axial tensile lub zog ntawm thawb (squeeze) siab yeeb nkab yog pom tseeb zoo dua li cov yeeb nkab winding, uas tuaj yeem siv rau hauv micro-negative siab pipeline.