Filter with relief and check valves

Claim 2

A relief valve for a filter assembly in which an outside-in tubular filter element is mounted in a housing having a fluid inlet and a central fluid outlet at one end, comprising: a valve seat mounted at said one end of said filter element, said seat having; an opening therethrough; and a seating surface adjacent said opening; a flexible valve member having a portion resiliently biased against said seating surface to resist normal fluid pressure when said filter element is unclogged; and a generally flat, rigid movable plate mounted adjacent said valve member and through which said valve member is biased, said plate having a main portion parallel to said plane of said opening and an extension providing a guide for a coil spring, said spring acting to so bias said valve member.

Claim 3

A relief valve for a filter assembly in which an outside-in tubular filter element is mounted in a housing having a fluid inlet and a central fluid outlet at one end, comprising: a valve seat mounted at said one end of said filter element, said seat having; an opening therethrough; a seating surface spaced from the plane of said opening in the direction away from said one end; and a flexible valve member having a first portion fixed and sealed relative to said seat at the side of said opening opposite said seating surface and a second portion resiliently biased against said seating surface to resist normal fluid pressure when said filter element is unclogged; and a valve housing having a resilient portion acting to bias in a closed position an antidrain valve of said assembly.

Claim 4

A relief valve for a filter assembly in which an outside-in tubular filter element is mounted in a housing having a fluid inlet and a central fluid outlet at one end, comprising: a valve seat mounted at said one end of said filter element, said seat having; an opening therethrough; a seating surface spaced from the plane of said opening in the direction away from said one end; and a flexible valve member having a first portion fixed and sealed relative to said seat at the side of said opening opposite said seating surface and a second portion resiliently biased against said seating surface to resist normal fluid pressure when said filter element is unclogged; and a valve housing having a resilient portion acting to bias in a closed position an antidrain valve of said assembly.

Claim 5

The valve of claim 2 wherein said housing is generally cylindrical with an outer annular portion comprising said resilient portion.

Claim 6

The valve of claim 3 wherein said annular portion has a rib adjacent its outer periphery in contact with said antidrain valve.

Claim 7

A relief valve for a filter assembly in which an outside-in tubular filter element is mounted in a housing having a fluid inlet and a central outlet at one end, comprising: a relief valve seat mounted at said one end of said filter element; a housing having a generally annular resilient extension which normally biases an antidrain valve in its closed position; and a flexible member sandwiched between said housing and said relief valve seat, the innner portion of which cooperates with said relief valve seat to provide said relief valve and the outer portion of which is said antidrain valve, said housing being stepped and welded at a surface parallel to said seat to projections of the seat that extend through the flexible member.

Claim 8

A relief valve for a filter assembly in which an outside-in tubular filter element is mounted in a housing having a fluid inlet and a central outlet at one end, comprising: a relief valve seat mounted at said one end of said filter element; a housing having a generally annular resilient extension which normally biases an antidrain valve in its closed position; and a flexible member sandwiched between said housing and said relief valve seat, the innner portion of which cooperates with said relief valve seat to provide said relief valve and the outer portion of which is said antidrain valve, said housing being stepped and welded at a surface parallel to said seat to projections of the seat that extend through the flexible member.