An Example Of What To Watch Out For When Designing A Positive Bottom Seal Connection
Design Engineers concentrate on the materials they need to use for the connector and port, ensuring chemical compatibility. They also focus on the size of the connector, making sure that what protrudes out of the port will not interfere with other components. Oftentimes not enough attention is given to the port and thread depths. Here “the devil is in the details,” and a positive bottom seal connection is dependent upon those details.
First Things First
To begin, ask yourself two crucial things: How deep is the overall depth of the port? And, how deep is the thread on the port? When tapping (threading) a port, it’s not feasible to have a full thread – as the threading die will not allow it. However, the thread can’t simply stop at an unspecified depth: if it’s too shallow the sealing face of the connection (i.e., flare or ferrule) may not reach bottom and result in a leak.
Next, match the depth of the port with the length of the connector on the mating assembly. Take into consideration not only the length of the thread of the connector, but also the boss (unthreaded portion of the fitting) as well as any added component lengths (i.e., washer, o-ring, ferrules, etc.).
A fluidics system’s design must take into account even what may be perceived as an ordinary feature. Many times, fluid line connections mistakenly fall into that category. And without a properly designed fluidic connection, the system will not operate to its full capacity or worse: it could leak.
For your design to be successful, pay close attention to the fluid connection details and you might just save you and your design from you know who.
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