Common choices are metal tubing (such as stainless steel or copper) and rigid plastic tubing (such as PEEK, nylon, Teflon®, Kynar® or polyethylene). Adding an additional, freely rotating rear ferrule can disconnect the nut from the front ferrule, preventing torque transfer.Ĭompression fittings are most often used with "hard" grade tubing because the tubing wall must be rigid enough to withstand the compression forces applied by the ferule. Single Ferrule Made from PTFE (Polytetrafluoroethylene) Ferrule provides a seal when installed within a Compression Fitting adapterCap and body of. I make sure the ferrule is lined up correctly. I try real hard to make sure the tube is straight with the fitting. For some reason, I only have about 50/50 chance when doing so with Pex tubing. With stainless steel, rotation of the ferrule can also lead to wear and permanent leakage. I have put together many metal-to-metal compression fitting connections in my life. The resulting rotation can cause the ferrule to compress asymmetrically or shift over time due to residual torque. With harder materials such as steel, however, torque is often transferred from the compression nut to the ferrule when the nut is tightened. Single ferrule designs minimize the total number of components and work reliably when manufacturing softer materials (plastic or brass, for example). Most basic compression fittings have a single ferrule. Metal ferrules are suitable for a wide temperature range, and can withstand high pressure loads, without relaxation. Most commonly used ferrules, however, are made of metal. The ferrule is the main sealing component of a compression fitting, and is manufactured in a wide range of material grades, from stainless steel to graphite.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |