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.
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Today's Featured Article - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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