Filter cartridge with clean side anti-drainback valve

A clean side anti-drainback valve in combination with a filter cartridge having an annular filter element with a hollow core, the annular filter element supported on an annular valve support having an upper surface and defining a passage leading out of the filter cartridge, the anti-drainback valve comprising:

• an annular valve seat having a central opening, a base, and a peripheral flange, said peripheral flange mounted atop said upper surface of the annular valve support with the central opening in alignment with the passage leading out of the filter cartridge;
• a valve mounted on the valve seat for movement between a first position where it closes the passage through the valve seat and a second position in which it opens the passage through the valve seat;
• and
• a biasing device disposed between the valve and valve seat for urging the valve to the first position, and
• the filter cartridge comprising:
• the valve support disposed in the hollow core of the annular filter element and having an annular surface upon which the annular valve seat is supported.