# US 9,433,881 B2 · Liquid filter assembly; and, methods

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 9,433,881 B2
- Document ID: US9433881B2
- Status: Granted
- Kind: B2
- Application number: 13/400,226
- Filed: 2012-02-20
- Published: 2012-06-14
- Granted: 2016-09-06
- Earliest claimed: 2003-12-22
- Assignees: Donaldson Company, Inc.
- Applicants: Angelo Schiavon; Mauro Cantoni; Andrey Zanettin; Claudio Formica
- Inventors: Angelo Schiavon; Mauro Cantoni; Andrey Zanettin; Claudio Formica
- Web page: https://patentgrep.com/patent/US9433881B2

## CPC

- B01D 29/21: with corrugated, folded or wound sheets
- B01D 29/54: arranged concentrically or coaxially
- B01D 29/96: in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters (B01D29/09, B01D29/70 take precedence)
- B01D 35/0276: {Filtering elements with a vertical rotation or symmetry axis mounted on tanks or reservoirs}
- B01D 35/147: Bypass or safety valves
- B01D 35/153: Anti-leakage or anti-return valves
- B01D 35/157: Flow control valves: Damping or calibrated passages
- B01D 35/1573: {Flow control valves}
- B01D 35/1576: {Calibrated passages}
- B01D 35/16: Cleaning-out devices {, e.g. for removing the cake from the filter casing or for evacuating the last remnants of liquid}
- B01D 35/30: Filter housing constructions
- B01D 2201/295: with projections extending in a radial outward direction, e.g. for use as a guide, spacing means
- B01D 2201/296: Other than having a circular shape
- B01D 2201/302: having inlet or outlet ports
- B01D 2201/34: Seals or gaskets for filtering elements
- B01D 2201/40: Special measures for connecting different parts of the filter
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

A liquid filter assembly is provided. The assembly includes a liquid filter cartridge and a housing. The liquid filter cartridge, includes, among other things, first and second, opposite, end caps each having a central aperture therethrough. A seal arrangement including a radially directed seal is mounted on a seal support of the first end cap that projects away from the second end cap. The cartridge includes a seal mount configured to define a seal plane non-orthogonal to a central axis of the cartridge. The housing includes a filter head and a housing sidewall. The filter head includes a filter head having a body, a top cover and a bottom aperture opposite the top cover. The housing extends through the bottom aperture. The cartridge as described is installed in the housing, with an end cap radially sealed against a tube in a bottom of the housing.

## Claims

### Claim 1

A liquid filter cartridge comprising:
(a) primary filter media surrounding a central volume and defining a central axis, and the cartridge having a seal mount positioned adjacent to the filter media configured to define a seal plane non-orthogonal to the central axis;
(b) a first end cap positioned on a first end of the media;
(i) the first end cap having a central aperture therethrough;
(ii) the first end cap including a seal support thereon;
(iii) the seal support projecting in a direction away from the primary filter media;
(iv) a radially directed seal mounted on the seal support of the first end cap and configured to seal against a portion of a filter housing when liquid filter cartridge is installed in the filter housing for use;
(c) a second end cap positioned at an opposite end of the media from the first end cap;
(i) the second end cap having a central aperture therethrough;
(ii) the seal support of the first end cap projecting in a direction away from the second end cap.

### Claim 2 (depends on 1)

A liquid filter cartridge according to claim 1 including:
(a) a bypass filter cartridge section positioned on the first end cap in extension away from the second end cap.

### Claim 3 (depends on 1)

A liquid filter cartridge according to claim 1 wherein:
(a) the seal mount is positioned on the second end cap.

### Claim 4 (depends on 1)

A liquid filter cartridge according to claim 1 wherein:
(a) the seal mount is configured to define a seal plane extending at an acute angle, with respect to the central axis, within the range of 30°-60°, inclusive.

### Claim 5 (depends on 4)

A liquid filter cartridge according to claim 4 wherein:
(a) the radial seal is configured to form an inwardly directed radial seal against a stand pipe surrounded by the radial seal, when the filter cartridge is installed in the filter housing.

### Claim 6 (depends on 1)

A liquid filter cartridge according to claim 1 wherein:
(a) the radial seal is configured to form an inwardly directed radial seal against a stand pipe surrounded by the radial seal, when the filter cartridge is installed in the filter housing.

### Claim 7

A liquid filter assembly comprising:
(a) a housing comprising a filter head and a housing sidewall;
(i) the filter head comprising:
(A) a filter head body;
(B) a top cover removable from the filter head body to define a service opening in the filter head; and
(C) a bottom aperture positioned opposite the operable top cover and service opening;
(ii) the housing sidewall being positioned to extend through the bottom aperture in a direction opposite the top cover;
(iii) the housing including a bottom end opposite the filter head, the housing including a tube on the bottom end;
(b) a liquid filter cartridge comprising:
(i) primary filter media surrounding a central volume and defining a central axis, and the cartridge having a seal mount positioned adjacent to the filter media configured to define a seal plane non-orthogonal to the central axis;
(ii) a first end cap positioned on a first end of the media;
(A) the first end cap having a central aperture therethrough;
(B) the first end cap including a seal support thereon;
(C) the seal support projecting in a direction away from the primary filter media;
(D) a radially directed seal mounted on the seal support of the first end cap and configured to seal against a portion of the housing when liquid filter cartridge is installed in the housing for use;
(iii) a second end cap positioned at an opposite end of the media from the first end cap;
(A) the second end cap having a central aperture therethrough;
(B) the seal support of the first end cap projecting in a direction away from the second end cap.

### Claim 8 (depends on 7)

A liquid filter assembly according to claim 7 including:
(a) a bypass filter cartridge section positioned on the first end cap in extension away from the second end cap.

### Claim 9 (depends on 7)

A liquid filter assembly according to claim 7 including:
(a) a suction filter assembly secured to the liquid filter assembly; the suction filter assembly including:
(i) an extension of suction filter media defining a central volume; and,
(ii) a first, non-helical spring, directionally biased valve arrangement comprising a ring shaped valve member having at least one cut valve therein positioned and configured to:
(A) readily permit liquid flow from a tank reservoir through the suction filter media and into an interior of the housing; and,
(B) to resist liquid flow from the housing interior, into a tank reservoir.

### Claim 10 (depends on 9)

A liquid filter assembly according to claim 9 wherein:
(a) the ring-shaped valve member has a plurality of flap valves therein and defines an internal volume.

### Claim 11 (depends on 7)

A liquid filter assembly according to claim 7 wherein:
(a) the seal mount is positioned on the second end cap.

### Claim 12 (depends on 7)

A liquid filter assembly according to claim 7 wherein:
(a) the seal mount is configured to define a seal plane extending at an acute angle, with respect to the central axis, within the range of 30°-60°, inclusive.

### Claim 13 (depends on 12)

A liquid filter assembly according to claim 12 wherein:
(a) the radially directed seal is configured to form an inwardly directed radial seal against a tube surrounded by the radially directed seal, when the filter cartridge is installed in the housing.

### Claim 14 (depends on 12)

A liquid filter assembly according to claim 12 including:
(a) a bypass valve arrangement positioned within the housing.

### Claim 15 (depends on 14)

A liquid filter assembly according to claim 14 wherein:
(a) the bypass valve arrangement includes:
(i) a slidably mounted tubular valve member slidable between an open orientation and a closed orientation.

### Claim 16 (depends on 7)

A liquid filter assembly according to claim 7 wherein:
(a) the radially directed seal is configured to form an inwardly directed radial seal against a tube surrounded by the radially directed seal, when the filter cartridge is installed in the housing.