Oil Seal - an overview | ScienceDirect Topics
All of these seals have a seal oil inlet at a differential pressure above the reference gas pressure; however the bushing seal (Fig. 6.5) uses a level control valve and an overhead seal oil tank to maintain a DP of approximately 5 psid (0.3 bar) and the seals in Figs. 6.6 and 6.7 utilize a DP control valve to maintain the differential pressure. This is because they are essentially both contacting type seals and can …
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