Patent ID: 8453848

Claim:
A liquid filter cartridge comprising: (a) first and second, opposite, end caps; (i) the first end cap having a first central liquid flow aperture therethrough; and, (b) an extension of filter media secured to, and extending between, the first and second end caps; (i) the extension of filter media comprising pleated media defining an open central volume in fluid flow communication with the first central aperture and having a pleat inner diameter and a pleat outer diameter; and, (ii) the media comprising a total of at least 20 pleats; (c) a first seal arrangement comprising a first radially directed seal; and, (d) the first seal arrangement being positioned to provide a larger seal diameter (D s A) when sealing than a diameter of the first central aperture; (i) D s A being within the range of 0.95-1.05 D b A inclusive, wherein D b A is a calculated seal diameter at which no net surface axial force on the first end cap toward or away from the second end cap due to liquid pressures against the opposite surfaces of the first end cap, in use, results, with D b A calculated assuming that any pressure drop across the media occurs at the media center line and is a step function and that each media pleat assumes a triangular shape the same as each other pleat.