Three valve filter element support for filter cartridge
View Patent ↗A unitary three valve filter element support is used in a filter cartridge in which the filter cartridge includes an annular filter element within a housing closed by an end plate having a central opening surrounded by an array of radial openings spaced a fixed radial distance from one another. The unitary support has an annular sealing lip for sealing with the end cap of the filter element, which sealing lip deflects under oil pressure providing a first valve to allow oil to bypass the filter element if the filter media of the filter element is clogged. A second valve is a dirty side anti-drainback valve that is provided by a radial flange projecting from the unitary body. A third valve is a clean side valve aligned with the hollow core of the annular filter element to prevent drainback of clean oil and to prevent refilling of the filter cartridge with used or unfiltered oil.
1. A combination valve support and sealing element for use in a filter cartridge wherein the filter cartridge includes an annular filter element having a hollow core and an end cap and is disposed in a housing closed by an end plate having a central opening surrounded by an array of radial openings spaced a fixed radial distance from the central opening, the combination valve support and sealing element comprising:
a unitary body of flexible resilient material;
the unitary body having a central opening of a constant diameter, which central opening is coaxial with the central opening of the end plate, the diameter of the central opening being less than the diameter of the area circumscribed by the radial openings;
the unitary body having a first annular section which projects into the hollow core of the filter element for sealing with the filter element and a second section coextensive with the first section, the first annular section having an annular sealing ring thereon for sealing with the end cap and, the second section sealing only with the end plate around the central opening through the end plate;
the unitary body having a radially projecting flange which is axially spaced from the second section and projects radially beyond the spaced radial openings in the end plate for sealing around the spaced radial openings to provide an anti-drainback valve;
a plurality of radially extending ribs on the radially extending flange, the radially extending ribs having rib portions projecting axially on the first annular section of the unitary body and being axially spaced from the annular sealing ring on the first annular section of the unitary body, which annular sealing ring deflects inwardly when the filter element is clogged in order to provide a bypass for fluid when fluid is unable to flow through the filter element, and
a clean side valve unitary with the unitary body for preventing pre-filling of the cartridge.
2. The combination valve support and sealing element of claim 1 wherein the clean side valve is a purse valve supported on a plate which spans the central opening of the unitary body, the purse valve being comprised of a pair of lips which are normally closed.
3. The combination valve support and sealing element of claim 1 wherein the axially extending rib portions engage an end cap on the filter element to support the filter element and provide axially extending gaps therebetween and wherein oil applies pressure to the sealing ring, which pressure causes the sealing ring to deflect inwardly when a preselected pressure indicative of a clogged filter element is reached.
4. A valve support and sealing element in combination with a filter cartridge in which the filter cartridge includes an annular filter element having a hollow core and end cap with a flange that extends into the hollow core, the filter cartridge being disposed in a housing closed by an end plate having a central opening surrounded by an array of radial openings spaced a fixed radial distance from the central opening, the combination comprising:
a unitary body of flexible resilient material;
the unitary body having a central opening of a constant diameter, which central opening is coaxial with the central opening of the end plate, the diameter of the central opening being less than the diameter of the area circumscribed by the radial openings;
the unitary body having a first annular section which projects into the hollow core of the filter element for sealing with the filter element and a second section coextensive with the first annular section, the first annular section having an annular sealing ring thereon for sealing with the flange of the end cap and, the second section sealing only with the end plate around the central opening through the end plate;
the unitary body having a radially projecting flange which is axially spaced from the second section and projects radially beyond the spaced radial openings in the end plate for scaling around the spaced radial openings to provide an anti-drainback valve,
a plurality of radially extending ribs on the radially extending flange, the radially extending ribs having rib portions projecting axially on the first annular section of the unitary body and being axially spaced from the annular sealing ring on the first annular section of the unitary body, which annular sealing ring deflects inwardly when the filter element is clogged in order to provide a bypass for oil when oil is unable to flow through the filter element, and
a clean side valve unitary with the unitary valve body for preventing pre-filling of the cartridge.
5. The combination valve support and sealing element of claim 4 wherein the clean side valve is a purse valve supported on a plate which spans the central opening of the unitary body, the purse valve being comprised of a pair of lips which are normally closed.
6. The combination of claim 5 wherein axially extending rib portions engage the end cap on the filter element to support the filter element and provide axially extending gaps therebetween and wherein oil applies pressure to the sealing ring, which pressure causes to the sealing ring to deflect inwardly away from the end cap flange when a preselected pressure indicative of a clogged filter element is reached.
7. The combination of claim 5 wherein the flexible resilient material of the unitary body is rubber.
8. A unitary valve within a filter cartridge disposed between a filter element and an end plate, comprising:
a unitary valve body of resilient flexible material including
a bypass valve portion unitary with the valve body, the bypass valve portion being configured as a collar having a sealing portion for sealing with the filter element and spaced projections upstream of the sealing portion, the spaced projections being disposed between and engaging both the bypass valve portion and the filter element for allowing direct fluid pressure application to the sealing portion, wherein when the filter element is clogged, increased fluid pressure separates the sealing portion from the filter element allowing the fluid to bypass the filter element, and
a clean side valve portion unitary with the unitary valve body for preventing pre-filling of the filter cartridge.
9. The unitary valve according to claim 8 wherein an anti-drainback valve configured as a skirt extends radially from the collar portion.
10. The unitary valve according to claim 9 wherein ribs extend over the skirt to provide channels between the filter element and valve body for applying fluid pressure to the sealing portion.
11. The unitary valve of claim 10 wherein the resilient flexible material is rubber or nitrile rubber.
12. The unitary valve according to claim 11 wherein ribs extend over the valve body to provide channels for applying fluid pressure to the annular lip.
13. The unitary valve according to claim 8 wherein the projections are ribs on the collar.
14. The unitary valve according to claim 8 wherein the sealing portion is an annular lip.
15. The unitary valve according to claim 8 wherein the valve includes a portion abutted by the filter element for supporting the filter element thereon.
16. The unitary valve of claim 8 wherein the clean side valve portion includes a purse valve supported on a plate which spans a central opening of the unitary body, the purse valve being comprised of a pair of lips which are normally closed.