What is the difference between WITH ANTI-DRAIN BACK VALVE and WITHOUT ANTI-DRAIN BACK VALVE in a filter, Is one better than the other ?
What does the drain back valve do ?
What does the drain back valve do ?
drain back question
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The anti-drain vack valve helps to keep the filter full of oil and not draining back into the crankcase while the engine is shut down(many don't work well), so that upon startup, the engine will not be starved for oil(no clatter upon startup). Filters without anti-drainback valve (ADBV) are either for applications where the filters are mounded vertical(straight up) or for applications where the engines have an internal ADBV allowing the filter to remain full while the engine is shutdown.
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Keeping the filter full is a co-benefit. Not too many OEM's require 100% integrity of the ADBV. Those who don't have it are vertical mounted and don't have substantial back flow potential to backflush the media. If holding ADBV's were a must. No one would allow a Fram or other nitrile fitted filter on a car. They all fatigue before the OEM recommended max OCI/FCI's.
Vertical mounts stop backflowing when the air reaches the center tube, breaking the siphon.
Vertical mounts stop backflowing when the air reaches the center tube, breaking the siphon.
Well said Gary!
Gary said it well. I was particularly impressed this week when I cut open a filter and found the anti-drain valve with ridges on the top side and a spring so tight that the can literally sprung open. There is a lot of pressure on that valve to keep it from closing. You could never put that much on a fram without it colapsing.
Sorry for the off topic, but thumbs up to Donaldson...their filters rock!!
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