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The primary purpose of an integral DBB valve is to increase the oil flow from the engine to the crankcase. The pump, which is usually powered by the engine, is connected to the valve. The oil pressure from the engine is transferred to the pump and then released through the valve. This increases the amount of oil in the crankcase. Tag - integral double block and bleed valve, integral dbb valve https://www.sealexcel.com/what-is-a-double-block-and-bleed-valve/