The good news is they are readily available, so it’s easy to replace one should it develop a leak. Once these are assembled it is best to leave them together as each time they are loosened & tighten it wears out the threads and it’s means of sealing. These connections require a liquid thread sealant or Teflon tape to seal properly. This fitting establishes a seal through the metal-to-metal wedging that occurs when this thread is tightened. The nice thing about these is that they cannot be over tightened and can be reused indefinitely, but the sealing surfaces must be kept clean. The tongue or raised portion can be found inside the female valve and the groove is on the male side. These types of fittings do well when vibration is present, under vacuum or positive pressure, and can remain tight under a large range of temperatures. These fittings work by utilizing a metal to metal seal when tightened. The 8 & 20 size designations are based on the ID of the fitting. The two sizes typically seen are DN8 & DN20. This type of fitting is the commonly used in the field and has become an industry standard. What types of fittings are common in the field? To learn more about proper gas handling techniques, check out our blog. Our SF6 Analyzer Fittings Kit helps eliminates constantly searching for the right fitting when hooking up to a SF6 gas circuit breaker.
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