![]() ![]() #Compression fitting install#Keep this in mind, and don’t install a compression fitting in an area that’s subjected to frequent flexing or sudden pressure changes. Wrenches and pliers don’t typically burst into flames.Ĭompression fittings are not as solid as a soldered connection. Remember the mention of not needing soldering or welding? That makes a compression fitting a good idea in an area near a high heat or potentially flammable source. Once the nut stops turning with reasonable force, stop tightening. This could damage the ferrule inside or the tube itself. When assembling a compression fitting, avoid the temptation to over-tighten the nut. If a fitting is needed in an area that may need to be disassembled for maintenance, the joints can be broken and reassembled without damage to the connection. Further, no special skill or tool is needed to assemble and install the fitting. The threads alone won’t tell you what you need to know, as it’s difficult to look at threads quickly and determine if they are tapered or parallel, let alone if they are port or tube connectors.Ĭompression fittings eliminate the need for soldering or welding a connection, which makes them quick and simple to use. If you need more proof, look for a nut and the aforementioned ferrule (ring). This is the quickest way to identify a compression fitting. The compression fitting will have a seat inside for the tube. ![]() If you’re looking at a fitting and wondering if it’s a threaded or compression, take a look inside. ![]() This takes all the pressure off the mechanical connection. The ferrule forms the seal, not the nut, the threads or any mechanical connection. When the compression nut is properly tightened, the ferrule is pressed against the tube with enough force to eliminate excess space in the joint, which prevents fluid or gas from leaking. This is done with the three piece assembly (comprised of a) compression nut, connector and an inner ring (the ferrule). So in this case, the threads simply needed to hold the fitting together with the compression nut.Īs you can see, compression fittings form a seal by applying force. Compression ends typically are a parallel shape and instead of sealing on the threads, the seal point is created with the assistance of a ferrule (ring, olive or sleeve) and a compression nut. Whereas compression fittings have a 3-piece connection that is tasked with its connection to tubes. These threads create the seal for the connection with the support of Teflon tape or pipe dope and are manufactured in a tapered, cone-shape. However, they use the threads differently.ĭifferences – Threaded fittings have a 1-piece connection end that is used to connect to port/block. Similarities – Threaded and compression fittings both use threads to help make their connections. Threaded and compression fittings look nearly identical, but they connect in very different ways while functioning the same. When building or maintaining a pneumatic or hydraulic system, it is important to understand the fittings you are using. ![]()
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