One-piece anti-drain back valve allowing relief valve flow
An oil filter includes a housing defining a cavity. The housing includes an aperture for providing fluid to the cavity. A filter assembly having a filter media is arranged in the cavity and separates the cavity into an inlet side and an outlet side. A relief valve assembly has a relief valve movable to selectively fluidly connect the inlet and outlet sides to bypass the filter media. An anti-drain back valve includes a closed position sealing the aperture in the housing from the cavity while permitting a fluid connection between the aperture in the housing and the relief valve. The relief valve assembly includes a relief valve retainer supporting the relief valve. The anti-drain back valve includes a wall spaced from the relief valve retainer forming a chamber. Apertures in the wall and holes in the relief valve fluidly connect the aperture of the housing to the relief valve throughout various positions of the anti-drain back valve.
1 . A fluid filter comprising:
a housing defining a cavity and an aperture for providing fluid to the cavity;
a filter assembly arranged in the cavity separating the cavity into an inlet side and an outlet side;
a relief valve assembly having a relief valve movable to selectively fluidly connect the inlet side and the outlet side; and
an anti-drain back valve including a closed anti-drain back valve position sealing the aperture from the cavity while permitting a fluid connection between the aperture and the relief valve.
2 . The fluid filter according to claim 1 wherein the relief valve assembly includes a relief valve retainer and a spring biasing the relief valve against the relief valve retainer in a closed relief valve position, the relief valve retainer including a hole fluidly connecting the aperture to the relief valve.
3 . The fluid filter according to claim 2 wherein the filter assembly includes an end disc supporting a filter media, the anti-drain back valve having a first sealing portion supported between the end disc and the relief valve retainer.
4 . The fluid filter according to claim 3 wherein the spring is arranged between the end disc and the relief valve.
5 . The fluid filter according to claim 3 wherein the housing includes a tapping plate having a central threaded hole, the tapping plate providing the aperture in the housing, and a second sealing portion of the anti-drain back valve arranged between the tapping plate and the relief valve retainer.
6 . The fluid filter according to claim 1 wherein the anti-drain back valve is generally annular in shape with a generally V-shaped cross-section, the anti-drain back valve including a first generally annular leg providing a sealing lip movable between an open anti-drain back valve position and the closed anti-drain back valve position and a second generally annular leg secured relative to the housing.
7 . The fluid filter according to claim 6 wherein the second generally annular leg includes a wall spaced from the relief valve assembly to form a chamber, the wall having an aperture fluidly connecting the chamber to the aperture in the housing.
8 . The fluid filter according to claim 7 wherein the relief valve assembly includes a relief valve retainer and a spring biasing the relief valve against the relief valve retainer in a closed relief valve position, the relief valve retainer including a hole fluidly connecting the chamber to the relief valve.
9 . The fluid filter according to claim 7 wherein the wall includes multiple apertures arranged circumferentially about the wall.
10 . The fluid filter according to claim 6 wherein the first generally annular leg includes a first sealing portion arranged between an end disc of the filter assembly and a relief valve retainer.
11 . The fluid filter according to claim 10 wherein the second generally annular leg extends from the first sealing portion to a tapping plate of the housing.
12 . The fluid filter according to claim 10 wherein the first generally annular leg extends at an acute angle relative to the end disc.
13 . The fluid filter according to claim 10 wherein the second generally annular leg includes a second sealing portion arranged between the relief valve retainer and the tapping plate providing the aperture in the housing.
14 . The fluid filter according to claim 6 wherein the first generally annular leg and the second generally annular leg are at approximately a right angle relative to one another.
15 . The fluid filter according to claim 6 wherein the closed anti-drain back valve position obstructs the relief valve from the inlet side with the relief valve in a closed relief valve position.
16 . The fluid filter according to claim 1 wherein a relief valve retainer supports the relief valve and includes a hole, the anti-drain back valve includes a wall spaced from the relief valve retainer forming a chamber, the wall includes an aperture, and the aperture in the wall and the hole fluidly connect the aperture of the housing to the relief valve.
17 . The fluid filter according to claim 16 wherein the hole and the aperture in the wall are misaligned with one another.
18 . An anti-drain back valve for a fluid filter comprising:
a generally annular body with a generally V-shaped cross-section, the generally annular body having an apex providing a first sealing portion;
a first generally annular leg extending from the apex for providing an anti-drain back feature; and
a second generally annular leg extending from the apex to a second sealing portion and transverse to the first generally annular leg, the second generally annular leg providing a wall having at least one aperture for providing fluid communication through the anti-drain back valve to a relief valve.