Patent ID: 6096199
Filing Date: 2000-08-01
Classification: B01D,Y10T

Abstract:
A lubricating oil filter cartridge for filtering oil in a machine at both low oil temperatures and at higher oil temperatures wherein the oil is more viscous at low temperatures than at higher temperatures, resulting in higher oil pressure in the filter cartridge at low temperatures than at the higher temperatures, the filter cartridge comprising:a filter media within the cartridge;a primary path within the cartridge for lubricating oil to flow from an inlet of the cartridge, through the filter media and out of an outlet of the cartridge when the filter media is unclogged;a bypass path within the cartridge for bypassing the filter media, the bypass path connecting the inlet to the outlet when the filter media is clogged; anda bypass valve disposed between the inlet and the outlet, the bypass valve being configured and arranged for opening at a selected oil pressure indicative of the filter media being clogged, the selected pressure being substantially higher at the low oil temperatures than at the higher oil temperatures, whereby the by-pass valve compensates for cold flow filtration while not starving the machine for oil at higher temperatures when the filter media becomes clogged.