# US 2025/0146431 A1 · Reset valve for compression release brake

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- Number: US 2025/0146431 A1
- Document ID: US20250146431A1
- Status: Published application
- Kind: A1
- Application number: 18/940,598
- Filed: 2024-11-07
- Published: 2025-05-08
- Earliest claimed: 2023-11-08
- Assignees: Cummins Inc.
- Applicants: Cummins Inc.
- Inventors: Dixon Malcolm Correa; Arnab Chanda; Alan Ronald Bennett
- Web page: https://patentgrep.com/patent/US20250146431A1

## CPC

- F01L 13/065: {Compression release engine retarders of the "Jacobs Manufacturing" type}
- F01L 1/18: Rocking arms or levers
- F01L 1/181: {Centre pivot rocking arms}
- F01L 1/267: {with means for varying the timing or the lift of the valves}
- F01L 13/06: for braking
- F01L 2013/105: {Hydraulic motors}
- F01L 2305/00: Valve arrangements comprising rollers
- F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES

## Abstract

An engine brake reset valve includes a cylindrical housing body having an end and a central cavity therein. The reset valve includes a first valve part attached to a second valve part, wherein the central cavity is sized to receive the first valve part and the second valve part. The first and second valve parts are movable within the central cavity between open and closed positions. When the second valve part is in a closed position, the second valve part engages and blocks the central orifice to prevent fluid pressure from entering the central orifice. When the second valve part is in an open position, the second valve part moves away from the central orifice to enable fluid pressure to enter the central orifice.

## Claims

### Claim 1

An engine brake reset valve comprising:
a cylindrical housing body having an end and a central cavity therein;
a first valve part attached to a second valve part, wherein the central cavity is sized to receive the first valve part and the second valve part, the first and second valve parts are movable within the central cavity between open and closed positions;
wherein the cylindrical housing body defines a central orifice, when the second valve part is in a closed position the second valve part engages and blocks the central orifice to prevent fluid pressure from entering the central orifice, when the second valve part is in an open position the second valve part moves away from the central orifice to enable fluid pressure to enter the central orifice.

### Claim 2 (depends on 1)

The engine brake reset valve of claim 1, further comprising:
a first spring positioned in the central cavity, the first spring arranged to apply pressure relative to movement of a cam lobe against a first primary piston.

### Claim 3 (depends on 1)

The engine brake reset valve of claim 1, further comprising:
a second spring positioned on the first valve part.

### Claim 4 (depends on 1)

The engine brake reset valve of claim 1, further comprising:
wherein the cylindrical housing body defines a lateral orifice fluidly connected to the central orifice.

### Claim 5 (depends on 1)

The engine brake reset valve of claim 1, further comprising:
a piston crown operably assembled with a piston body positioned in the central cavity, wherein the piston crown includes a cylindrical portion that defines a through-hole therein that is sized to receive the first valve part.

### Claim 6 (depends on 5)

The engine brake reset valve of claim 5, wherein the first valve part includes a retention clip to retain the first valve part assembled with the piston crown.

### Claim 7 (depends on 5)

The engine brake reset valve of claim 5, wherein the piston body includes a cylindrical portion that defines a through-hole therein that is sized to receive and retain the cylindrical portion of the piston crown therein.

### Claim 8 (depends on 1)

The engine brake reset valve of claim 1, wherein the second valve part is spherical in shape.

### Claim 9 (depends on 1)

A first primary piston comprising the engine brake reset valve of claim 1.