Why is oil filter anti-drainback valve critical in vertical application?

Why is oil filter anti-drainback valve critical in vertical application?

11-04-2003, 01:40 PM

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OnlyCummins

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Join Date: May 2003 Location: FL Posts: 127 Old Reader's Rigs Gallery

Why is oil filter anti-drainback valve critical in vertical application?

One of the much pointed out weak points of a much maligned oil filter is its 'cheap' (poorly functioning?) anti-drainback valve. Just wondering why it's so critical in an oil filter mounted vertically? Don't think there's enuf residual pressure after shutdown to force the oil out of the filter (but what do I know), so why would a poorly functioning or even non-functioning anti-drainback valve present a problem at startup?

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