Filter element with torsion lock and/or sliding piston, assembly and methods

A filter cartridge, comprising:

• a canister having an open end and a second canister end opposite the open end;
• a piston carried by the canister, the piston providing a cap capping the open end to provide a filter chamber in the canister, the piston having a range of sliding movement relative to the canister,
• an inlet port through the open end for receiving unfiltered fluid provided through the piston;
• an outlet port through the open end for returning filtered fluid;
• a filter media extending in the filter chamber and along a fluid flow path that extends from the inlet port to the outlet port with the filter media being arranged in fluid series between the inlet port and the outlet port;
• and
• further comprising a torsion lock detent arranged on the piston and thereby movable relative to the canister, wherein the piston has an internal side along the filter chamber and external side facing away from the filter chamber, wherein the torsion lock detent is on the external side.

A filter cartridge, comprising:

• a canister having an open end and a second canister end opposite the open end;
• a piston carried by the canister, the piston providing a cap capping the open end to provide a filter chamber in the canister, the piston having a range of sliding movement relative to the canister,
• an inlet port through the open end for receiving unfiltered fluid provided through the piston;
• an outlet port through the open end for returning filtered fluid;
• a filter media extending in the filter chamber and along a fluid flow path that extends from the inlet port to the outlet port with the filter media being arranged in fluid series between the inlet port and the outlet port;
• a spring member in the canister, the spring member arranged to bias the piston away from the second canister end;
• a catch provided at the open end and retaining the piston to the canister, the spring member urging the piston in abutment with the catch, and wherein the piston has an outer annular surface in sliding contact with an inner annular surface of the canister;
• and
• a torsion lock detent provided by the piston and thereby movable relative to the canister wherein the piston has an internal side facing the filter media and external side along an outside of the filter cartridge facing away from the filter media, wherein the torsion lock detent is along the external side.

A filtration assembly including a filter cartridge, the filter cartridge, comprising:

• a canister having an open end and a second canister end opposite the open end;
• a piston carried by the canister, the piston providing a cap capping the open end to provide a filter chamber in the canister, the piston having a range of sliding movement relative to the canister,
• an inlet port through the open end for receiving unfiltered fluid provided through the piston;
• an outlet port through the open end for returning filtered fluid;
• and
• a filter media extending in the filter chamber and along a fluid flow path that extends from the inlet port to the outlet port with the filter media being arranged in fluid series between the inlet port and the outlet port;
• and further comprising a filter head removably connected to the filter cartridge, the filter head comprising:
• a base portion and an annular rim portion, the base portion comprising an unfiltered inlet and a filtered outlet, the unfiltered inlet in fluid communication with the inlet port upstream of the filter media, the filter outlet in fluid communication with the outlet port downstream of the filter media, the annular rim portion receiving the filter cartridge with a threaded connection between the annular rim portion and the filter cartridge, wherein the piston is arranged to axially abut the base portion;
• and
• wherein first and second interlocking torsion lock detents are provided on the base portion and the piston, respectively that provide torsion locking between the filter head and the filter cartridge.