Dual flow, spin-on filter

Claim 2

A filter element for filtering a flow of fluid with respect thereto comprising a perforated central tubular member defining a central discharge chamber having inlet and outlet end portions and having a plurality of apertures extending laterally therethrough in communication with said discharge chamber, primary filter means disposed about said perforated tubular member for filtering a portion of said flow of fluid, the outlet end portion of said perforated tubular member being open and adapted for connection to a discharge passage, fluid restrictor means disposed within the inlet end of the perforated tubular member and having a continuously open fluid metering orifice therein concentric with said tubular member for passing a metered portion of said fluid flow into said discharge chamber and secondary filter means disposed at the inlet end portion of the perforated tubular member adjacent to said fluid restrictor means and comprising a filter disc located upstream from the fluid metering orifice.

Claim 3

The filter element set forth in claim 1 wherein there is a tubular insert mounted in said inlet end portion of said central tubular member, and said fluid restrictor means is mounted within said tubular insert.

Claim 4

The filter element set forth in claim 1 wherein said tubular insert is diametrically stepped intermediate the ends thereof to provide a relatively large base portion and a first reduced inner portion with a radially extending annular shoulder portion therebetween, said first reduced inner portion being seated within said central tubular member, said base portion of said insert being of greater diameter than said tubular member and extending outwardly from said inlet end of said tubular member.

Claim 5

The filter element set forth in claim 3 wherein said fluid restrictor means is a stepped disc having a radially outwardly extending flange, a central disc portion and an intermediate tubular connecting portion, said intermediate tubular connecting portion being closely fitted in said first reduced inner portion of said tubular insert with the radially outwardly extending flange seated on said annular shoulder portion of said tubular insert.

Claim 6

The filter element set forth in claim 4 wherein said metering orifice is located in the center of said central disc portion.

Claim 7

The filter element set forth in claim 3 wherein said first reduced inner portion of said tubular insert has an outside diameter less than the inside diameter of said central tubular member to provide an annular space between said central tubular member and said first reduced inner portion, said second filter means having an annular mounting portion fitted in the space between said tubular member and said first reduced upper portion in sealed relationship to said first reduced upper portion.

Claim 8

The filter element set forth in claim 6 wherein said fluid restrictor means is a central disc portion integrally attached to said first reduced inner portion, and said metering orifice means extends through said central disc portion.

Claim 9

The filter element set forth in claim 3 wherein said fluid restrictor means is an integral transverse wall closing the inner end of said first reduced inner portion.

Claim 10

The filter element set forth in claim 8 wherein said secondary filter means is a screen disc seated within said first reduced inner portion against said transverse wall.

Claim 11

The filter element set forth in claim 9 together with an adapter disc seated within said base portion, and having legs extending into said first reduced inner portion bearing against said screen disc for holding said screen disc in position against said transverse wall.

Claim 12

The filter element set forth in claim 8 wherein said secondary filter means is a screen disc seated within said relatively large base portion.

Claim 13

The filter element set forth in claim 1 together with means within said tubular member for by-passing fluid passing through said metering orifice means around said secondary filter means when the fluid pressure differential across said secondary filter means in the normal direction of fluid flow exceeds a predetermined pressure differential.

Claim 14

The filter element set forth in claim 1 wherein said primary filter means is a fine filter and said secondary filter means is coarse in comparison to said first filter means.

Claim 15

The filter element set forth in claim 1 in combination with a casing therefor.

Claim 16

The filter element set forth in claim 14 wherein said casing comprises a tubular casing portion surrounding said filter element and radially spaced outwardly thereof to provide an annular fluid passage, a mounting plate secured to one end of said tubular casing portion and overlying said one end of said central tubular member in axially spaced relationship thereto, and a closed end portion secured to the opposite end of said tubular casing portion in axially spaced relationship to said other end of said central tubular member, said mounting plate having a centrally disposed outlet neck in axial alignment with said tubular member and inlet passage means spaced radially outwardly from said neck.

Claim 17

The filter element set forth in claim 15 together with non-return valve means for preventing fluid flow outwardly from said casing through said inlet passage means.

Claim 18

The filter element set forth in claim 16 together with by-pass means for by-passing said filter element within said casing directly from said inlet passages to said outlet chamber upon the pressure differential between the inlet passages and said outlet chamber exceeding a predetermined value.

Claim 19

The combination defined in claim 14 wherein resilient compression means are provided between one end of the casing and the filter element, saiD compression means engaging said filter element at the inlet end of the central perforated tubular member.

Claim 20

The combination as defined in claim 18 wherein the compression means engages said secondary filter means.

Claim 21

The filter element set forth in claim 1 wherein said fluid restrictor means comprises a diametrically stepped tubular insert mounted in said inlet end portion of said central tubular member, said stepped tubular insert having an enlarged outer end portion snugly fitted within said central tubular member, a reduced inner end portion and an intermediate shoulder portion connecting said enlarged and reduced end portions, said reduced end portion having an integral in-turned annular flange which defines said metering orifice, said secondary filter means being seated against said intermediate shoulder within said enlarged outer end portion.

Claim 22

The filter element set forth in claim 20 wherein the enlarged outer end of said tubular insert is provided with an out-turned annular flange which is seated against the end of said inlet end portion of the perforated tubular member.

Claim 23

The filter element set forth in claim 1 wherein said fluid restrictor means comprises a first tubular insert mounted in said inlet end portion of said central tubular member, said tubular insert having an outer end with an out-turned annular flange which is seated against the outer end of said inlet end portion and an inner end with an in-turned annular flange which defines said metering orifice, a second tubular insert snugly fitted within the end of said tubular insert, said second tubular insert having an outer end with an out-turned annular flange seated against the out-turned annular flange of said first tubular insert and an inner end provided with an in-turned annular flange, said second tubular insert being of substantially less length than said first tubular insert so that the in-turned annular flanges of said first and second inserts are spaced apart to provide a secondary filter chamber therebetween, said secondary filter means being a filter disc of less diameter than the inside diameter of said first tubular insert provided within said secondary filter chamber, and resilient means for normally biasing said filter disc against the in-turned annular flange of said second tubular insert, said resilient means yielding upon the occurrence of a predetermined pressure differential across said filter disc to allow said filter disc to move away from said in-turned annular flange to provide a fluid passage through said secondary filter chamber around said filter disc and out through said metering orifice into said discharge passage.

Claim 24

The filter element set forth in claim 22 wherein said resilient means is a coil compression spring having one end seated inside said secondary filter chamber against the in-turned flange of said first tubular insert, and its other end seated against said filter disc.

Claim 25

The filter element set forth in claim 1 wherein said fluid restrictor means comprises a tubular insert mounted in said inlet end portion of said central tubular member in sealing engagement therewith, barrier means provided across one end of said tubular insert, said barrier means having said metering orifice therein, said secondary filter means comprising a filter disc disposed within said tubular insert, said filter disc having a smaller diameter than the inside diameter of said tubular insert to provide a fluid passage between said filter disc and said tubular insert, annular seating means within said tubular insert and spaced from said barrier means for seating said filter disc, resilient means normally biasing said filter disc toward said seating means against the normal direction of fluid flow through said filter disc, said resilient means yielding upon the occurrence of a predetermined pressure differential across said filter disc to allow said filter disc to move away from said annular seating means.

Claim 26

A filter element as set forth in claim 1 wherein the primary fIlter means is of the depth type.

Claim 27

In a filter device for filtering a flow of fluid with respect thereto a housing having a base plate closing one end of the housing and having an inlet formed therein for the flow of fluid to the device and an outlet formed therein for the flow of fluid from the device, a filter element mounted within the housing, said filter element comprising a central tubular member defining a central discharge chamber and having inlet and outlet end portions and having a plurality of apertures extending through said tubular member in communication with said discharge chamber, primary filter means disposed about said tubular member for filtering a portion of said flow of fluid, the outlet end portion of said tubular member being open and adapted for connection to a discharge passage, fluid restrictor means having a continuously open fluid metering orifice therein disposed within the inlet end portion of said tubular member for passing a metered portion of said fluid flow into said discharge chamber, and secondary filter means disposed within the inlet end of the tubular member, adjacent said fluid restrictor means, said filter device including spacing means engaging said outlet end portion of said tubular member for spacing said filter element from said base plate and for providing a discharge passage from said discharge chamber to said outlet opening, said secondary filter means comprising a filter disc located upstream from the fluid metering orifice.

Claim 28

In a filter device for filtering a flow of fluid with respect thereto a housing having a base plate closing one end of the housing and having an inlet formed therein for the flow of fluid to the device and an outlet formed therein for the flow of fluid from the device, a filter element mounted within the housing, said filter element comprising a central tubular member defining a central discharge chamber and having inlet and outlet end portions and having a plurality of apertures extending through said tubular member in communication with said discharge chamber, primary filter means disposed about said tubular member for filtering a portion of said flow of fluid, the outlet end portion of said tubular member being open and adapted for connection to a discharge passage, fluid restrictor means having a continuously open fluid metering orifice therein disposed within the inlet end portion of said tubular member for passing a metered portion of said fluid flow into said discharge chamber, and secondary filter means disposed within the inlet end of the tubular member, adjacent said fluid restrictor means, said filter device including spacing means engaging said outlet end portion of said tubular member for spacing said filter element from said base plate and for providing a discharge passage from said discharge chamber to said outlet opening, said secondary filter means comprising a filter disc located upstream from the fluid metering orifice.

Claim 29

The filter element set forth in claim 26 wherein said spacing means includes a relief valve means which is normally closed, and which opens upon the occurrence of an abnormal pressure differential between the inlets and outlets of said filter device to bypass said filter elements.

Claim 30

The filter device set forth in claim 27 together with anti-drainback valve means covering said inlet in said base plate.

Claim 31

The filter device set forth in claim 26 wherein said spacing means includes a unitary relief valve and anti-drainback valve means.

Claim 32

A filter element for filtering a flow of fluid with respect thereto comprising a central tubular member defining a central discharge chamber and having a plurality of apertures extending therethrough in communication with said discharge chamber, a primary filter means disposed about said tubular member for filtering a portion of said flow of fluid, one end portion of said tubular member being open and adapted for connection to a discharge passage, a fluid restrictor means having a fluid metering orifice therein disposed adjacent the other end portion of said tubular member for passing a metered portion of said fluid flow into said discharge chamber, a secondary filter means disposed adjacent said fluid restrictor means for filtering the fluid passing through said metering orifice means, and a tubular insert mounted in said other end portion of said central tubular member and said fluid restrictor means being within said tubular insert, said tubular insert being diametrically stepped intermediate the ends thereof to provide a relatively large base portion and a first reduced inner portion with a radially extending annular shoulder portion therebetween, said first reduced inner portion being seated within said central tubular member, said base portion of said insert being of greater diameter than said tubular member and extending outwardly from said other end of said tubular member, said fluid restrictor means being a stepped disc having a radially outwardly extending flange, a central disc portion and an intermediate tubular connecting portion, said intermediate tubular connecting portion being closely fitted in said first reduced inner portion of said tubular insert with the radially outwardly extending flange seated on said annular shoulder portion of said tubular insert, said tubular insert having a second reduced inner portion connected to the inner end of said first reduced inner portion by a second annular shoulder portion, and said secondary fIlter means having a mounting ring fitted closely within said second reduced inner portion in sealed relationship thereto.

Claim 33

A filter element for filtering a flow of fluid with respect thereto comprising a central tubular member defining a central discharge chamber and having a plurality of apertures extending therethrough in communication with said discharge chamber, a primary filter means disposed about said tubular member for filtering a portion of said flow of fluid, one end portion of said tubular member being open and adapted for connection to a discharge passage, a fluid restrictor means having a fluid metering orifice therein disposed adjacent the other end portion of said tubular member for passing a metered portion of said fluid flow into said discharge chamber, a secondary filter means disposed adjacent said fluid restrictor means for filtering the fluid passing through said metering orifice means, and a tubular insert mounted in said other end portion of said central tubular member and said fluid restrictor means being within said tubular insert, said tubular insert being diametrically stepped intermediate the ends thereof to provide a relatively large base portion and a first reduced inner portion with a radially extending annular shoulder portion therebetween, said first reduced inner portion being seated within said central tubular member, said base portion of said insert being of greater diameter than said tubular member and extending outwardly from said other end of said tubular member, said fluid restrictor means being a stepped disc having a radially outwardly extending flange, a central disc portion and an intermediate tubular connecting portion, said intermediate tubular connecting portion being closely fitted in said first reduced inner portion of said tubular insert with the radially outwardly extending flange seated on said annular shoulder portion of said tubular insert, said tubular insert having a second reduced inner portion connected to the inner end of said first reduced inner portion by a second annular shoulder portion, and said secondary fIlter means having a mounting ring fitted closely within said second reduced inner portion in sealed relationship thereto.

Claim 34

The filter element set forth in claim 30 wherein said secondary filter means further includes a filter screen secured to said mounting ring.

Claim 35

The filter element set forth in claim 31 wherein said filter screen is frusto conical in shape having an open base end secured to said mounting ring and a reduced diameter opposite end extending further within said tubular member from said mounting ring, and a closure plug secured to said reduced diameter opposite end.

Claim 36

A filter element for filtering a flow of fluid with respect thereto comprising a central tubular member defining a central discharge chamber and having a plurality of apertures extending therethrough in communication with said discharge chamber, a primary filter means disposed about said tubular member for filtering a portion of said flow of fluid, one end portion of said tubular member being open and adapted for connection to a discharge passage, a fluid restrictor means having a fluid metering orifice therein disposed adjacent the other end portion of said tubular member for passing a metered portion of said fluid flow into said discharge chamber, a secondary filter means disposed adjacent said fluid restrictor means for filtering the fluid passing through said metering orifice means, and a tubular insert mounted in said other end portion of said central tubular member, and said fluid restrictor means being mounted within said tubular insert, said secondary filter means including a filter member disposed within said tubular insert surrounding said metering orifice on the side of said metering orifice toward said one end portion of said tubular member, resilient biasing means normally biasing said filter member into sealing engagement with said fluid restrictor means, said resilient biasing means being adapted to yield under a predetermined fluid pressure to allow the fluid flowing through said metering orifice to bypass said filter member.

Claim 37

A filter element for filtering a flow of fluid with respect thereto comprising a central tubular member defining a central discharge chamber and having a plurality of apertures extending therethrough in communication with said discharge chamber, a primary filter means disposed about said tubular member for filtering a portion of said flow of fluid, one end portion of said tubular member being open and adapted for connection to a discharge passage, a fluid restrictor means having a fluid metering orifice therein disposed adjacent the other end portion of said tubular member for passing a metered portion of said fluid flow into said discharge chamber, a secondary filter means disposed adjacent said fluid restrictor means for filtering the fluid passing through said metering orifice means, and a tubular insert mounted in said other end portion of said central tubular member, and said fluid restrictor means being mounted within said tubular insert, said secondary filter means including a filter member disposed within said tubular insert surrounding said metering orifice on the side of said metering orifice toward said one end portion of said tubular member, resilient biasing means normally biasing said filter member into sealing engagement with said fluid restrictor means, said resilient biasing means being adapted to yield under a predetermined fluid pressure to allow the fluid flowing through said metering orifice to bypass said filter member.

Claim 38

A filter element for filtering a flow of fluid with respect thereto comprising a central tubular member defining a central discharge chamber and having a plurality of apertures extending therethrough in communication with said discharge chamber, a primary filter means disposed about said tubular member for filtering a portion of said flow of fluid, one end portion of said tubular member being open and adapted for connection to a discharge passage, a fluid restrictor means having a fluid metering orifice therein disposed adjacent the other end portion of said tubular member for passing a metered portion of said fluid flow into said discharge chamber, a secondary filter means disposed adjacent said fluid restrictor means for filtering the fluid passing through said metering orifice means, and a tubular insert mounted in said other end portion of said central tubular member, said fluid restrictor means being a transverse wall member mounted intermediate the ends of said tubular insert and dividing said tubular insert into a fluid entrance portion and a fluid exit portion, the fluid entrance portion facing outwardly from said other end of said tubular member, and said fluid exit portion facing into the interior of said central tubular member, said secondary filter means including a cup shaped filter member disposed within said fluid exit portion and having an out-turned lip portion adjacent the open end of said cup shaped filter member disposed in surrounding relationship to said metering orifice, resilient biasing means normally biasing said cup shaped filter member axially toward said transverse wall, said biasing means being adapted to yield in response to a predetermined fluid pressure differential across said cup shaped filter member to permit fluid flowing through said metering orifice means to by-pass said cup shaped filter means when the pressure differential across said filter means in the direction of the other end of said tubular member exceeds a predetermined pressure.

Claim 39

A filter element for filtering a flow of fluid with respect thereto comprising a central tubular member defining a central discharge chamber and having a plurality of apertures extending therethrough in communication with said discharge chamber, a primary filter means disposed about said tubular member for filtering a portion of said flow of fluid, one end portion of said tubular member being open and adapted for connection to a discharge passage, a fluid restrictor means having a fluid metering orifice therein disposed adjacent the other end portion of said tubular member for passing a metered portion of said fluid flow into said discharge chamber, a secondary filter means disposed adjacent said fluid restrictor means for filtering the fluid passing through said metering orifice means, and a tubular insert mounted in said other end portion of said central tubular member, said fluid restrictor means being a transverse wall member mounted intermediate the ends of said tubular insert and dividing said tubular insert into a fluid entrance portion and a fluid exit portion, the fluid entrance portion facing outwardly from said other end of said tubular member, and said fluid exit portion facing into the interior of said central tubular member, said secondary filter means including a cup shaped filter member disposed within said fluid exit portion and having an out-turned lip portion adjacent the open end of said cup shaped filter member disposed in surrounding relationship to said metering orifice, resilient biasing means normally biasing said cup shaped filter member axially toward said transverse wall, said biasing means being adapted to yield in response to a predetermined fluid pressure differential across said cup shaped filter member to permit fluid flowing through said metering orifice means to by-pass said cup shaped filter means when the pressure differential across said filter means in the direction of the other end of said tubular member exceeds a predetermined pressure.

Claim 40

The filter element set forth in claim 34 wherein the fluid exit portion of said tubular insert has a radially inwardly extending annular flange at the fluid exit end thereof defining an exit aperture of diameter greater than the outside diameter of said cup shaped filter member to permit the cup shaped filter member to reciprocate axially through said exit aperture with a fluid passage between the edge of said inwardly extending flange and said cup shaped filter member, said resilient biasing means being a coiled spring having one end seated against said inwardly extending annular flange and the other end seated against the out-turned lip portion of said cup shaped filter member.