Poulton Le Fylde, FY6 8JU, UK

Can a by-pass filter have a by-pass valve?

Can a by-pass filter have a by-pass valve?

No, by-pass filters do not require a by-pass valve. A by-pass valve is required in full-flow filtration to make sure that the engine gets lubrication when oil is cold or the filter is plugged. If oil is cold, by-pass filter will receive less oil flow and in case it is plugged, will not function anymore.