# US 9,555,350 B2 · Bypass valve, device comprising bypass valve, and filter insert of the device

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- Number: US 9,555,350 B2
- Document ID: US9555350B2
- Status: Granted
- Kind: B2
- Application number: 13/985,239
- Filed: 2012-02-10
- Published: 2013-12-12
- Granted: 2017-01-31
- Earliest claimed: 2011-02-18
- Assignees: Hengst GmbH & Co. KG
- Applicants: Wilhelm Ardes
- Inventors: Wilhelm Ardes
- Web page: https://patentgrep.com/patent/US9555350B2

## CPC

- B01D 35/1475: {Pressure relief valves or pressure control valves}
- B01D 27/103: {Bypass or safety valves}
- B01D 35/147: Bypass or safety valves
- F16K 15/063: {the valve being loaded by a spring}
- B01D 2201/0415: Details of supporting structures
- B01D 2201/291: End caps
- B01D 2201/305: Snap, latch or clip connecting means
- B01D 2201/4084: Snap or Seeger ring connecting means
- Y10T 137/7841: One valve carries head and seat for second valve
- Y10T 137/7867: Sequential
- Y10T 137/7976: Plural separating elements
- Y10T 137/8085: Hollow strainer, fluid inlet and outlet perpendicular to each other
- Y10T 137/86509: Sequentially progressive opening or closing of plural ports
- Y10T 137/86525: Flow combining with flow dividing
- Y10T 137/86807: Sequential opening or closing of serial ports in single flow line
- Y10T 137/86928: Sequentially progressive opening or closing of plural valves
- Y10T 137/87338: Flow passage with bypass
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A bypass valve having an adjustable flow resistance for a device through which a fluid medium flows. The valve includes a seat and a body which is biased closed, and which is movable in the opening direction by a fluid medium pressure difference between the inflow and the outflow side of the valve when the pressure difference exceeds a threshold. A bypass flow path connects the inflow side to the outflow side through the seat. The bypass valve includes a screen disposed in the bypass flow path. The valve body has two different open positions that depend on the fluid medium pressure difference. The entire cross-section of the bypass flow path is covered by the screen in a first valve body open position with a lower pressure difference, and a screen-free bypass flow path cross-section is exposed in a second valve body open position with a greater pressure difference.

## Claims

### Claim 1

A bypass valve of a device through which a fluid medium flows, the device having a varying flow resistance, comprising:
a valve seat and
a valve body that works together with the valve seat and to which there is applied a preloading force in the closing direction,
the valve body being movable in the opening direction by a fluid medium pressure difference, exceeding a specifiable boundary value, between an inflow side and an outflow side of the bypass valve,
a bypass flow path running through the valve seat that connects the inflow side and the outflow side of the bypass valve while bypassing the device,
a sieve element situated in the bypass flow path,
wherein the valve body has two different opening position regions that are a function of the medium pressure difference, such that in a first opening position region of the valve body, given a lower fluid medium pressure difference, an entire cross-section of the bypass flow path is covered by the sieve element, and in a second opening position region of the valve body, given a greater fluid medium pressure difference, in addition, a sieve-free bypass flow path cross-section is exposed,
wherein the sieve element is formed as a part of a contour limiting the bypass flow path, and wherein the valve body, in its first opening position region, is axially movably seated in sealing fashion on the sieve element, and wherein the valve body, in its second opening position region, is situated at a distance from the sieve element.

### Claim 2 (depends on 1)

The bypass valve as recited in claim 1, wherein in the second opening position region of the valve body, the sieve element covers only a part of the cross-section of the bypass flow path, and the additional sieve-free bypass flow path cross-section is thus exposed.

### Claim 3 (depends on 1)

The bypass valve as recited in claim 1, wherein the sieve element is tightly connected with its one end face region to the contour that has the valve seat and that limits the bypass flow path, concentric to the valve seat, and wherein the sieve element has at its other end face region, radially inwardly, a sealing ring region that runs concentric to the valve seat, and wherein the axially movable valve body has an outer circumferential region that in the first opening position region of the valve body is axially movable seated in sealing fashion on the sealing ring region of the sieve element, and wherein, in the second opening position region of the valve body, is situated axially at a distance from the sealing ring region.

### Claim 4 (depends on 3)

The bypass valve as recited in claim 3, wherein the sieve element is one of detachably connected to the contour having the valve seat by one of being pressed, clamped, locked and screwed thereto, fixedly connected to the contour having the valve seat by one of being glued and welded thereto, and being made in one piece with the contour.

### Claim 5 (depends on 1)

The bypass valve as recited in claim 1, wherein the sieve element is formed as a hollow cylindrical annular sieve having a dirt particle collecting region that is open only upwardly during operation of the device.

### Claim 6 (depends on 1)

The bypass valve as recited in claim 1, wherein the sieve element has at least one upper and one lower reinforcing ring running in the circumferential direction, as well as a plurality of reinforcing struts running between the reinforcing rings in one of the axial direction and oblique to the axial direction.

### Claim 7 (depends on 1)

The bypass valve as recited in claim 1, wherein the sieve element has guide and centering ribs that are distributed radially externally around its circumference and that work together with an inner circumference of a contour that limits the bypass flow path.

### Claim 8 (depends on 1)

A device having a bypass valve as recited in claim 1, wherein the device is a liquid filter having a housing that has a removable cover, having an inlet, opening into a raw side of the device, for liquid that is to be filtered, and having an outlet, going out from a clean side of the device, for filtered liquid, and having an exchangeable filter insert that separates the raw side and the clean side from one another, the filter insert being made up of a hollow cylindrical filter material body enclosed at its ends by two end plates, and wherein the bypass valve is a filter bypass valve whose valve seat is one of situated on and formed on the filter insert.

### Claim 9 (depends on 8)

The device as recited in claim 8, wherein the valve seat is formed on a central perforation in one of the two end plates of the filter insert.

### Claim 10 (depends on 9)

The device as recited in claim 9, wherein the valve seat is provided on the end plate of the filter insert that is in an upper position during operation of the liquid filter.

### Claim 11 (depends on 8)

The device as recited in claim 8, wherein the valve body is situated in an interior of the hollow cylindrical filter insert and is guided so as to be axially movable therein.

### Claim 12 (depends on 8)

The device as recited in claim 8, wherein the sieve element has guide and centering ribs that are distributed radially externally around its circumference and that work together with an inner circumference of a perforated support body situated in the hollow cylindrical filter insert.

### Claim 13 (depends on 8)

The device as recited in claim 8, wherein the sieve element is formed as a part of the filter insert, and wherein the valve body, in its first opening position region, is axially movably seated in sealing fashion on the sieve element, and wherein the valve body, in its second opening position region, is situated at a distance from the sieve element.

### Claim 14 (depends on 13)

The device as recited in claim 13, wherein the sieve element is tightly connected with its one end face region to the end plate having the valve seat, concentric to the valve seat, and wherein the sieve element has at its other end face region a sealing ring region that is situated radially inwardly and that runs concentric to the valve seat, and wherein the axially movable valve body has an outer circumferential region that in the first opening position region of the valve body works together in sealing fashion with the sealing ring region of the sieve element and that in the second opening position region of the valve body is situated axially at a distance from the sealing ring region.

### Claim 15 (depends on 14)

The device as recited in claim 14, wherein the sieve element is one of detachably connected to the end plate having the valve seat by one of being pressed, clamped, locked and screwed, being fixedly connected to the end plate having the valve seat by one of being glued and welded thereto, and being made in one piece with the end plate.

### Claim 16 (depends on 14)

A filter insert of a device as recited in claim 14, the filter insert being made up of a hollow cylindrical filter material body enclosed at its ends by two end plates, and having a valve seat of a filter bypass valve, and the valve seat being formed on a central perforation in one of the two end plates of the filter insert, wherein a sieve element, in the form of a hollow cylindrical annular sieve, is tightly connected, with its one end face region, to the end plate having the valve seat, concentric to the valve seat, and wherein the sieve element has at its other end face region, situated radially inwardly, a sealing ring region that runs concentric to the valve seat, in order to work together with an outer circumferential region of an axially movable valve body of the filter bypass valve.

### Claim 17 (depends on 16)

The filter insert as recited in claim 16, wherein the sieve element is one of detachably connected to the end plate having the valve seat by one of being pressed, clamped, locked and screwed thereto, being fixedly connected to the end plate having the valve seat by one of being glued and welded thereto, and being made in one piece with the end plate having the valve seat.

### Claim 18 (depends on 16)

The filter insert as recited in claim 16, wherein the filter material body of the filter insert has a filter fineness of between 8 and 25 μm, and wherein the sieve element has a sieve fineness of between 100 and 1,000 μm.

### Claim 19 (depends on 13)

A filter insert of a device as recited in claim 13, the filter insert being made up of a hollow cylindrical filter material body enclosed at its ends by two end plates, and having a valve seat of a filter bypass valve, and the valve seat being formed on a central perforation in one of the two end plates of the filter insert, wherein the end plate having the valve seat has, concentric to the valve seat, an annular sealing collar pointing axially toward the interior of the filter insert, whose inner circumference is formed to work together in radially sealing fashion with a free end face region, which can be guided in the sealing collar of the end plate in axially displaceable and radially sealing fashion, of a sieve element that is axially movable with a valve body of the filter bypass valve, over a part of the axial movement path of the sieve element.

### Claim 20 (depends on 8)

The device as recited in claim 8, wherein the filter material body of the filter insert has a filter fineness of between 8 and 25 μm, and wherein the sieve element has a sieve fineness of between 100 and 1,000 μm.