Abstract: Water or foreign matter can be prevented from entering a threaded engagement portion. When a first screw part formed in the vicinity of an opening end of a casing is threadedly engaged with a second screw part formed on a head, a filter element assembly is attached to the head, and an elastic member provided in a recessed part disposed adjacently with the first screw part on a face on which the first screw part is formed in the casing deforms along convex-concave shape of the second screw part.

Abstract: The filter device (10) is provided with a drain device (50) provided with a main body (51) and a plug (60). The main body (51) has a first opening (51a) which communicates to the outer side of a housing (20), a second opening (51b) which communicates with an inner side (42a) of a filter element (40), and a third opening (56) which communicates with a first channel (51c) communicating to the first opening (51a) and the second opening (51b) and a space (B) between the filter element (40) and the housing (20). The plug (60) is held within the first channel (51c), and is movable between a first position (P1) at which fluid is not discharged from the housing (20), and a second position (P2) at which fluid is discharged from the housing (20). The plug (60) is provided with a second channel (65) that communicates with the first channel (51c) and communicates with the outer side of the housing (20) when in the second position (P2).

Abstract: Filter device (10) is provided with a head (20), a filter element (40), and a housing (30). The head (20) is provided with an inlet (24) which is attached to a hydraulic circuit (5), and into which flows the operating oil (L1) that is to be filtered. The filter element (40) filters the operating oil (L1) that is to be filtered. The housing (30) has an opening (30b) through which the filter element (40) passes, and which holds the filter element (40) inside it. The filter element (40) is provided with an element main body (48), and an element pressing part (47). The element pressing part (47) is provided to the element main body (48). The element pressing part (47) is provided with a contact part (53) that can be shifted toward or away from the inner surface (30a) of the housing (30). A groove (35) that holds the contact part (53) is provided to the housing (30). The contact part (53) can be shifted until it comes out of the groove (35).

Abstract: A liquid filtration device that efficiently filters a filter element and vents pressurized vapors from inside the filter element. The liquid filtration device is comprised of a vent valve apparatus that is furnished within the main body of the filter head and a plug which is located on the filter housing. The main body has a first opening that is located on the outside of the filter housing, a second opening that communicates with the inside of the filter element, an opening that communicates with the second opening and the first opening and a third opening. The third opening permits communication between the filter element and the filter housing as well as between space and the passage found within the third opening. The plug is installed within this passage, and can move between a first position that does not vent pressurized vapors that are within the housing and a second position that vents pressurized vapors that are within the housing.

Abstract: Filter device (10) is provided with a head (20), a filter element (40), and a housing (30). The head (20) is provided with an inlet (24) which is attached to a hydraulic circuit (5), and into which flows the operating oil (L1) that is to be filtered. The filter element (40) filters the operating oil (L1) that is to be filtered. The housing (30) has an opening (30b) through which the filter element (40) passes, and which holds the filter element (40) inside it. The filter element (40) is provided with an element main body (48), and an element pressing part (47). The element pressing part (47) is provided to the element main body (48). The element pressing part (47) is provided with a contact part (53) that can be shifted toward or away from the inner surface (30a) of the housing (30). A groove (35) that holds the contact part (53) is provided to the housing (30). The contact part (53) can be shifted until it comes out of the groove (35).

Abstract: The filter device (10) is provided with a drain device (50) provided with a main body (51) and a plug (60). The main body (51) has a first opening (51a) which communicates to the outer side of a housing (20), a second opening (51b) which communicates with an inner side (42a) of a filter element (40), and a third opening (56) which communicates with a first channel (51c) communicating to the first opening (51a) and the second opening (51b) and a space (B) between the filter element (40) and the housing (20). The plug (60) is held within the first channel (51c), and is movable between a first position (P1) at which fluid is not discharged from the housing (20), and a second position (P2) at which fluid is discharged from the housing (20). The plug (60) is provided with a second channel (65) that communicates with the first channel (51c) and communicates with the outer side of the housing (20) when in the second position (P2).

Abstract: A liquid filtration device that efficiently filters a filter element and vents pressurized vapors from inside the filter element. The liquid filtration device is comprised of a vent valve apparatus that is furnished within the main body of the filter head and a plug which is located on the filter housing. The main body has a first opening that is located on the outside of the filter housing, a second opening that communicates with the inside of the filter element, an opening that communicates with the second opening and the first opening and a third opening. The third opening permits communication between the filter element and the filter housing as well as between space and the passage found within the third opening. The plug is installed within this passage, and can move between a first position that does not vent pressurized vapors that are within the housing and a second position that vents pressurized vapors that are within the housing.

Abstract: The case of a filter cartridge has the shape of a cylinder that is closed at one end and open at the other end, and has a coupling member that on the open end capable of coupling to the head; the filter element and a securing member are enclosed within this case; while the securing member is provided as a unit with an inner cylinder; this inner cylinder is removably inserted into the interior of the filter element; by means of this insertion, the filter element is combined as a unit with the securing member; and by means of the securing member becoming coupled to the coupling member, the filter element is secured within the case.

Abstract: The invention provides a filter apparatus wherein the filter element alone is replaceable and thus the case of the filter cartridge can be reused as is and not discarded. In a filter apparatus where fluid that flows in from an inlet in a head, passes through a filter element and flows out from an outlet in the head, the filter cartridge which is removably attached to the head comprises a case with a threaded ring on its outside peripheral surface that encloses a filter element and a retaining ring that retains it, and by using the threaded ring to removably fasten the retaining ring to the case, the filter element is fixed in position within the case, but by loosening the threaded ring from the retaining ring, the filter element can be removed from within the case and discarded.