Your explanation of the bypass and pressure relief valve in the oil filter is the way I was taught.The bypass relieves at XX PSI.Often confused one from the other.
pete 23"](quoted from post at 17:43:42 08/06/14) The valve in the filter is a by-pass relief valve. It's purpose is to allow cold oil to go around (by-pass) the filter and or if filter is plugged same thing. This is used on engines with full flow lube systems where all oil goes from pump to filter and then to engine component. Some engines have the bypass in the filter base, others have it in the filter. It is really not a pressure relief valve as that has a different function. It regulates maximum pressure in the system and your engine will also have one of those before filter and components. Like others have said, some engines have full flow, some have by pass filters. It doesn't mean it bypasses the filter, rather it just filters oil in parallel with oil gallery and filtered oil just goes to sump, not to engine components.[/quote]
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