# US 10,119,426 B2 · Slide valve for a waste heat recovery system

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- Number: US 10,119,426 B2
- Document ID: US10119426B2
- Status: Granted
- Kind: B2
- Application number: 15/375,598
- Filed: 2016-12-12
- Published: 2017-06-15
- Granted: 2018-11-06
- Earliest claimed: 2015-12-14
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Jeannette Kopp; Bernd Berghaenel; Luiz-Alexandre Colodel; Sophie-Charlotte Deger-Panthene; Stephan Wehr
- Web page: https://patentgrep.com/patent/US10119426B2

## CPC

- F01K 23/101: {Regulating means specially adapted therefor (F01K23/105, F01K23/108 take precedence)}
- F01K 23/065: {the combustion taking place in an internal combustion piston engine, e.g. a diesel engine}
- F01K 25/08: using special vapours
- F02G 5/02: Profiting from waste heat of exhaust gases
- F16K 11/07: with cylindrical slides
- F16K 11/0716: {with fluid passages through the valve member (F16K11/0704, F16K11/0708, F16K11/0712 take precedence)}
- F16K 31/0613: {with cylindrical slides}
- F16K 31/1266: {one side of the diaphragm being acted upon by the circulating fluid}
- F02G 2270/90: Valves
- Y02T 10/12: Improving ICE efficiencies
- F01K: STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES (gas-turbine or jet-propulsion plants F02; nuclear power plants, engine arrangements therein G21D)
- F02G: HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS (steam engine plants, special vapour plants, plants operating on either hot gas or combustion-product gases together with other fluid F01K; gas-turbine plants F02C; jet-propulsion plants F02K); USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- 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)}
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Slide valve (1), in particular for a waste heat recovery system of a combustion engine, having a valve housing (4), wherein an inlet passage (5) and an outlet passage (6) are formed in the valve housing (4). A substantially cylindrical slide (3) is guided in a longitudinally movable manner in a guide bore (20) in the valve housing (4), wherein the guide bore (20) can be connected hydraulically to the inlet passage (5) and to the outlet passage (6). A closing body (35, 35a) is arranged on the slide (3), wherein a slide seat (75, 75a) is formed between the guide bore (20) and the closing body (35, 35a). The guide bore (20) and the sliding body (35, 35a) form a sliding pair, wherein the sliding pair has the material combination steel-graphite or the material combination ceramic-graphite.

## Claims

### Claim 1

A slide valve (1), having a valve housing (4), wherein an inlet passage (5) and an outlet passage (6) are formed in the valve housing (4), wherein a substantially cylindrical slide (3) is guided in a longitudinally movable manner in a guide bore (20) in the valve housing (4), wherein the guide bore (20) is configured to be connected hydraulically to the inlet passage (5) and to the outlet passage (6), wherein a closing body (35, 35a) is arranged on the slide (3), wherein a slide seat (75, 75a) is formed between the guide bore (20) and the closing body (35, 35a), wherein the guide bore (20) and the sliding body (35, 35a) form a sliding pair, and wherein the sliding pair has a material combination steel-graphite, in which the guide bore is graphite and the sliding body is steel, or wherein the sliding pair has a material combination ceramic-graphite, in which the guide bore is ceramic and the sliding body is graphite, or the guide bore is graphite and the sliding body is ceramic.

### Claim 2 (depends on 1)

The slide valve (1) according to claim 1, characterized in that the sliding pair has the material combination steel-graphite.

### Claim 3 (depends on 1)

The slide valve (1) according to claim 1, characterized in that the sliding pair has the material combination steel-graphite and the steel is coated with a Ti(C,N)+MoS2 coating.

### Claim 4 (depends on 1)

The slide valve (1) according to claim 1, characterized in that the sliding pair has the material combination ceramic-graphite and in that the ceramic is a ZrO2 or Al2O3 ceramic.

### Claim 5 (depends on 1)

The slide valve (1) according to claim 1, characterized in that the graphite is provided with metal additives.

### Claim 6 (depends on 1)

The slide valve (1) according to claim 1, characterized in that a further outlet passage (7) is formed in the valve housing (4), wherein the guide bore (20) is configured to be connected hydraulically to the further outlet passage (7), and in that a further closing body (35b) is arranged on the slide (3), wherein a further slide seat (75b) is formed between the guide bore (20) and the further closing body (35b), wherein the guide bore (20) and the further closing body (35b) form a further sliding pair, and wherein the further sliding pair has the material combination steel-graphite or the material combination ceramic-graphite.

### Claim 7 (depends on 1)

The slide valve (1) as claimed in claim 1, characterized in that a valve tube (2) is arranged in the valve housing (4) and in that the guide bore (20) is formed in the valve tube (20).

### Claim 8 (depends on 7)

The slide valve (1) according to claim 7, characterized in that the valve tube (2) is embodied as a graphite bushing.

### Claim 9 (depends on 1)

A waste heat recovery system (100) comprising a bypass valve (1) including a slide valve (1) according to claim 1, the system also comprising a circuit (100a) carrying a working medium, wherein the circuit (100a) includes, in a direction of flow of the working medium, a pump (102), an evaporator (103), the bypass valve (1), an expansion machine (104) and a condenser (105), wherein a bypass line (106) is arranged in parallel with the expansion machine (104) and wherein the bypass valve (1) controls the mass flow of the working medium to the expansion machine (104) and to the bypass line (106).

### Claim 10 (depends on 9)

The waste heat recovery system (100) according to claim 9, characterized in that the working medium contains ethanol or cyclopentane.

### Claim 11 (depends on 9)

The waste heat recovery system (100) according to claim 9, characterized in that the bypass valve is configured to be operated at a temperature of the working medium of 300° C.

### Claim 12 (depends on 1)

The slide valve (1) according to claim 1, characterized in that the sliding pair has the material combination steel-graphite and the steel is coated with a low-friction material.

### Claim 13

A slide valve (1), having a valve housing (4), wherein an inlet passage (5) and an outlet passage (6) are formed in the valve housing (4), wherein a substantially cylindrical slide (3) is guided in a longitudinally movable manner in a guide bore (20) in the valve housing (4), wherein the guide bore (20) is configured to be connected hydraulically to the inlet passage (5) and to the outlet passage (6), wherein a closing body (35, 35a) is arranged on the slide (3), wherein a slide seat (75, 75a) is formed between the guide bore (20) and the closing body (35, 35a), wherein the guide bore (20) and the sliding body (35, 35a) form a sliding pair, and wherein the sliding pair has a material combination steel-graphite, in which the guide bore is graphite and the sliding body is steel.

### Claim 14 (depends on 13)

The slide valve (1) according to claim 13, characterized in that the steel is coated with a Ti(C,N)+MoS2 coating.

### Claim 15

A slide valve (1), having a valve housing (4), wherein an inlet passage (5) and an outlet passage (6) are formed in the valve housing (4), wherein a substantially cylindrical slide (3) is guided in a longitudinally movable manner in a guide bore (20) in the valve housing (4), wherein the guide bore (20) is configured to be connected hydraulically to the inlet passage (5) and to the outlet passage (6), wherein a closing body (35, 35a) is arranged on the slide (3), wherein a slide seat (75, 75a) is formed between the guide bore (20) and the closing body (35, 35a), wherein the guide bore (20) and the sliding body (35, 35a) form a sliding pair, and wherein the sliding pair has a material combination ceramic-graphite, in which the guide bore is ceramic and the sliding body is graphite, or the guide bore is graphite and the sliding body is ceramic.

### Claim 16 (depends on 15)

The slide valve (1) according to claim 15, characterized in that the sliding pair has the material combination ceramic-graphite and in that the ceramic is a ZrO2 or Al2O3 ceramic.