Do DIB-1 valves ALWAYS require a means of relieving cavity pressure (either automatically or manually as per API 6D)? My confusion is, for liquid service there should always be an LRK as thermal expansion is likely, but in gas service, is a means of relief required? API 6D is kind of vague as it says if fluid trapping in the cavity is possible (which is always the case with any valve?), and what if it is a CSA valve? My understanding is that due to the DPE seats it must have some means of relief (auto or otherwise) in case u/s seat fails for whatever reason.
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