IP Library › Granted Patent US 12678719
Granted Patent B2
US 12678719 · App. 18/348,465 · Granted Jul 14, 2026

Filter valve assembly

Inventors: Marek Paweł Jedliński (Wrocław, PL); Maciej Bujewicz (Wroclaw, PL)
Assignee: HAMILTON SUNDSTRAND CORPORATION
B01D35/1573B01D35/147B01D2201/16
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Quick Facts
Patent No.
US 12678719
App. No.
18/348,465
Granted
Jul 14, 2026
Kind
B2
Abstract

A filter assembly includes a manifold having a fluid inlet and a fluid outlet, a filter housing having a filter medium provided therein, the filter medium defining an inner filter chamber and defining an outer filter chamber between the filter medium and the filter housing, the filter housing being removably attached to the manifold so as to provide a fluid flow path from the inlet into the inner filter chamber, through the filter medium into the outer chamber and out of the outlet; characterised by the filter assembly further comprising a valve assembly mounted inside the manifold, the valve assembly comprising a shut off valve piston and a shut off valve spring arranged in engagement with the valve piston to bias the valve piston into a first position.

Claims (46)

1 . A filter assembly comprising:

a manifold having a fluid inlet and a fluid outlet;

a filter housing having a filter medium provided therein, the filter medium defining an inner filter chamber and defining an outer filter chamber between the filter medium and the filter housing, the filter housing being removably attached to the manifold so as to provide a fluid flow path from the inlet into the inner filter chamber, through the filter medium into the outer chamber and out of the outlet;

a valve assembly mounted inside the manifold, the valve assembly comprising:

a shut off valve piston;

a shut off valve spring arranged in engagement with the valve piston to bias the valve piston into a first position;

an adaptor ring located between the shut off valve piston and the filter housing and provided with an annular outlet seal, and wherein the shut off valve piston is provided with a radially extending flange and an inner piston wall configured such that as the filter housing is being detached from the manifold, the shut off valve spring expands to move the shut off valve piston to a shut off position whereby the radially extending flange is in sealing engagement with the adaptor ring and the outlet seal, and the inner piston wall is in sealing engagement with inlet seals such that flow from the fluid inlet and the fluid outlet is shut off from entering the filter housing; and

a bypass channel formed in the shut off valve piston between the fluid inlet and the fluid outlet and a bypass valve assembly comprising a bypass valve spool and a bypass valve spring, wherein in its default state, the bypass valve spring biases the bypass valve spool across the bypass channel to prevent flow from the fluid inlet to the fluid outlet via the bypass channel and wherein, when the pressure differential across the bypass valve spool exceeds a predetermined threshold, the pressure acting on the bypass valve spool causes the bypass valve spool to move against the bias of the bypass valve spring and to move away from the bypass channel to open the bypass channel and allow the flow of fluid from the fluid inlet to the fluid outlet via the bypass channel;

wherein the outlet seal is a lip seal.

2 . A filter assembly comprising:

a manifold having a fluid inlet and a fluid outlet;

a filter housing having a filter medium provided therein, the filter medium defining an inner filter chamber and defining an outer filter chamber between the filter medium and the filter housing, the filter housing being removably attached to the manifold so as to provide a fluid flow path from the inlet into the inner filter chamber, through the filter medium into the outer chamber and out of the outlet;

a valve assembly mounted inside the manifold, the valve assembly comprising:

a shut off valve piston;

a shut off valve spring arranged in engagement with the valve piston to bias the valve piston into a first position;

an adaptor ring located between the shut off valve piston and the filter housing and provided with an annular outlet seal, and wherein the shut off valve piston is provided with a radially extending flange and an inner piston wall configured such that as the filter housing is being detached from the manifold, the shut off valve spring expands to move the shut off valve piston to a shut off position whereby the radially extending flange in sealing engagement with the adaptor ring and the outlet seal, and the inner piston wall is in sealing engagement with inlet seals such that flow from the fluid inlet and the fluid outlet is shut off from entering the filter housing; and

a bypass channel formed in the shut off valve piston between the fluid inlet and the fluid outlet and a bypass valve assembly comprising a bypass valve spool and a bypass valve spring, wherein in its default state, the bypass valve spring biases the bypass valve spool across the bypass channel to prevent flow from the fluid inlet to the fluid outlet via the bypass channel and wherein, when the pressure differential across the bypass valve spool exceeds a predetermined threshold, the pressure acting on the bypass valve spool causes the bypass valve spool to move against the bias of the bypass valve spring and to move away from the bypass channel to open the bypass channel and allow the flow of fluid from the fluid inlet to the fluid outlet via the bypass channel;

the assembly further comprising:

a cap ring mounted to the top of the filter housing.

3 . A filter assembly comprising:

a manifold having a fluid inlet and a fluid outlet;

a filter housing having a filter medium provided therein, the filter medium defining an inner filter chamber and defining an outer filter chamber between the filter medium and the filter housing, the filter housing being removably attached to the manifold so as to provide a fluid flow path from the inlet into the inner filter chamber, through the filter medium into the outer chamber and out of the outlet;

a valve assembly mounted inside the manifold, the valve assembly comprising:

a shut off valve piston;

a shut off valve spring arranged in engagement with the valve piston to bias the valve piston into a first position;

an adaptor ring located between the shut off valve piston and the filter housing and provided with an annular outlet seal, and wherein the shut off valve piston is provided with a radially extending flange and an inner piston wall configured such that as the filter housing is being detached from the manifold, the shut off valve spring expands to move the shut off valve piston to a shut off position whereby the radially extending flange in sealing engagement with the adaptor ring and the outlet seal, and the inner piston wall is in sealing engagement with inlet seals such that flow from the fluid inlet and the fluid outlet is shut off from entering the filter housing; and

a bypass channel formed in the shut off valve piston between the fluid inlet and the fluid outlet and a bypass valve assembly comprising a bypass valve spool and a bypass valve spring, wherein in its default state, the bypass valve spring biases the bypass valve spool across the bypass channel to prevent flow from the fluid inlet to the fluid outlet via the bypass channel and wherein, when the pressure differential across the bypass valve spool exceeds a predetermined threshold, the pressure acting on the bypass valve spool causes the bypass valve spool to move against the bias of the bypass valve spring and to move away from the bypass channel to open the bypass channel and allow the flow of fluid from the fluid inlet to the fluid outlet via the bypass channel;

wherein the shut off valve spring is located in a blind cavity outside of the path of fluid flow through the assembly.

4 . The filter assembly of claim 1 , further comprising a supply chamber between the fluid inlet and the inner filter chamber.

5 . The filter assembly of claim 4 , further comprising a supply channel fluidly connecting the supply chamber and the inner filter chamber.

6 . The filter assembly of claim 1 , further comprising an outlet chamber between the outer filter chamber and the fluid outlet.

7 . The filter assembly of claim 1 , further comprising sealing means between the manifold and the filter housing.

8 . A fuel filter arranged between a fuel supply and a fuel application and comprising:

a filter assembly as recited in claim 1 , wherein the inlet is arranged to be connected to the fuel supply and the outlet arranged to be connected to the fuel application.

9 . The filter assembly of claim 2 , further comprising a supply chamber between the fluid inlet and the inner filter chamber.

10 . The filter assembly of claim 9 , further comprising a supply channel fluidly connecting the supply chamber and the inner filter chamber.

11 . The filter assembly of claim 2 , further comprising an outlet chamber between the outer filter chamber and the fluid outlet.

12 . The filter assembly of claim 2 , further comprising sealing means between the manifold and the filter housing.

13 . A fuel filter arranged between a fuel supply and a fuel application and comprising:

a filter assembly as recited in claim 3 , wherein the inlet is arranged to be connected to the fuel supply and the outlet arranged to be connected to the fuel application.

14 . The filter assembly of claim 3 , further comprising a supply chamber between the fluid inlet and the inner filter chamber.

15 . The filter assembly of claim 14 , further comprising a supply channel fluidly connecting the supply chamber and the inner filter chamber.

16 . The filter assembly of claim 3 , further comprising an outlet chamber between the outer filter chamber and the fluid outlet.

17 . The filter assembly of claim 3 , further comprising sealing means between the manifold and the filter housing.

18 . A fuel filter arranged between a fuel supply and a fuel application and comprising:

a filter assembly as recited in claim 3 , wherein the inlet is arranged to be connected to the fuel supply and the outlet arranged to be connected to the fuel application.