|
The extraordinary flex life performance of Teflon® T-62 is only part of the story. From the beginning, Resistoflex has recognized the importance of contour molding its bellows from extruded tubing as opposed to machining them from bar or tube stock, or blow molding them from isostatically molded tubes. That’s because only the contour molding process provides the optimal combination of flexibility and tensile strength. It prevents the stress concentrations common in machined bellows, vital because of PTFE’s inherent notch sensitivity. Furthermore, and perhaps most importantly, the activation/deflection forces are an order of magnitude lower with Resistoflex contour molded expansion joints than those made via any other process. Its smooth contours provide a better fit with exterior reinforcing rings, reducing the possibility of joint damage as they flex.
|
|
In this test, one expansion joint of each size is installed at neutral length on the flex tester and is flexed at 100% of the maximum allowable compression and extension. One cycle is defined as neutral-compression-neutral-extension-neutral at a specified pressure and temperature. Units are certified to 100,000 cycles while still retaining full pressure handling capability. This flex test comparison was performed with 2” 3-convolute expansion joints from various manufacturers. The test was performed at 250oF with 75 psig hot oil. Neutral-Extended-Neutral-Compressed-Neutral position equals one cycle. Each joint was extended and compressed to the published maximum allowable position. |
® T-62 PTFE resin by Dupont because of the extraordinary performance it provides.
