Patent ID: 8691085

Claim:
A filtering device, comprising: a base plate ( 12 ) having a threaded center hole ( 122 ) and a threaded side wall ( 124 ); a filter housing ( 11 ) having a cap-shaped body defining an opening, wherein the inner surface ( 111 ) of the filter housing ( 11 ) is threaded around the opening for sealingly coupling the threaded side wall ( 126 ) of the base plate ( 12 ); wherein the filter housing ( 11 ) and the base plate ( 12 ) cooperatively defines a receiving space ( 113 ); an anti-drainback valve ( 15 ) having a valve hole ( 151 ) defined in the center portion thereof arranged on the base plate ( 12 ) in the receiving space ( 113 ), wherein the valve hole ( 151 ) correspondingly aligns with the threaded center hole ( 122 ) of the base plate ( 12 ); a filter assembly ( 14 ) having a filter hole ( 1411 ) abutting on the anti-drainback valve ( 15 ), a centrally-hollowed filter media ( 141 ), a compact louvered inner core member ( 142 ) removably inserted into filter hole ( 1411 ), a first filtering cottoned end surface ( 1412 ) and a second filtering cottoned end surface ( 1413 ) arranged on two opposite ends of the filter media ( 141 ), the filter assembly ( 14 ) received in the receiving space ( 113 ), wherein the filter hole ( 1411 ) aligns with the valve hole ( 151 ) of the anti-drainback valve ( 15 ); and a bypass valve ( 13 ) having a central plate portion ( 132 ) and a pair of extending wing portions ( 131 ) pressingly arranged between the inner surface ( 111 ) of the filter housing ( 11 ) and the filter assembly ( 14 ); wherein the central plate portion ( 132 ) establishes pressing contact with the filter assembly ( 14 ), wherein the extending wing portions ( 131 ) establishes pressing contact with the inner surface ( 111 ) of the filter housing ( 11 ); wherein the compact louvered inner core member ( 142 ) has a truncated end truncated with respect to first filtering cottoned end surface ( 1412 ) such that the inner circumferential portions of filter media ( 141 ) adjacent the bypass valve ( 13 ) is free from flow restriction.