Flow sharing control block in sandwich plate design RS20

RE 64137/2021-09-29, Bosch Rexroth AG

ContentsFeatures ▶ Load pressure independent flow sharing (LUDV):

Distributes the flow between the directional valve sections as required, regardless of load pressure and available flow.

▶ Compact sandwich plate design, can be combined to adapt the control block to the requirements of different machine types

▶ No shuttle valve chain required ▶ Limitation of the maximum system pressure by a

common LS pressure relief valve ▶ Secondary pressure limitation (different options

available per section and consumer side) ▶ Sandwich plate design with a maximum of 10

directional valve sections ▶ Type of actuation

– Hydraulic – Electrohydraulic – Combined hydraulic/electrohydraulic actuation

▶ Applications: Wheeled excavators, cranes, wheeled loaders, forklift trucks and other construction machinery

▶ Size 20 ▶ Nominal pressure

– on the pump side 400 bar – on the consumer side 420 bar

▶ Maximum flow – on the pump side 400 l/min – per section 300 l/min (LUDV), 220 l/min (LS)

Modular system 2Functional description 3Technical data 7Example configurations 9Dimensions 11Recommended installation position 12Related documentation 13

Flow sharing control block in sandwich plate design RS20

RE 64137/2021-09-29Replaces: 2020-04-20

Bosch Rexroth AG, RE 64137/2021-09-29

2 RS20 | Control blockModular system

Modular system

▼ Modular system RS20

LS sectio

n

RS20

LUDV sectio

n

RS20

RS20 side

RS15 side

ADV sectio

n

RS20

Universa

l inlet

Inlet with

double ports

Stabiliz

ing module

RSM20

LUDV sectio

n

RS15

Bypass prio

rity

module RBM15

End plate

RS15

Optional:

End plate

RS20

The modular layout and flexible construction kit of the RS platform allows for maximum customization to meet individual customer requirements.The sandwich plate design makes it possible to freely combine the number of directional valves of size 20 with valve sections from the RS15 platform. Functions with very different flow requirements can be covered within one combined valve block, providing an optimized solution with regards to installation space, weight and cost.

Functions that previously could not be integrated into the main control block can now be combined in one control block. These include the stabilizing module (RSM20), the priority module (RBM15) and the anti-drift valve (ADV).

The pump and return flow channels pass through the entire control block without diversions or restrictions.

Features ▶ Free combination of LUDV, LS and anti-drift valve

sections ▶ Single-sided electrohydraulic control ▶ Electroproportional tank pre-load pressure adjustment

for cavitation-free movement or efficient movement without counter-pressure (inlet with double ports)

▶ Self-bleeding control covers to quickly and sustainably remove air out of the cover.

▶ Asymmetrical return flow channels (The channel R1 which is assigned to the consumer ports A has been enlarged in its cross section in order to optimally discharge high return flow quantities (of the cylinder head side).)

Further information ▶ Possible combinations RS modular system

see data sheet 64141 ▶ For directional valves RS15, see data sheet 64134 ▶ Stabilizing module RSM20 see data sheet 64628


3 Control block | RS20 Functional description

Functional description

GeneralType RS20 control blocks are based on hydraulically or electrohydraulically actuated flow sharing (LUDV) directional valves.The RS20 control block essentially consists of the inlet, several directional valves of the same or different sizes and an end section or end plate with optional additional ports.

InletThe inlet has line connections for pump (P), return flow (R), load-sensing (LS) and a measuring port (MP) as well as two mounting points. It contains all central functions (for variants and details, see page 4).

Directional valve sectionBasically, three RS20 directional valve variants are available (for details see page 5):

▶ LUDV section ▶ LUDV section with anti-drift valve (ADV) ▶ LS section

The flexible, modular construction kit allows for a high level of customization of each directional valve section.

Each standard valve RS20 (flange surfaces on both sides) essentially consists of the housing (1), a control spool (3), two load-holding valves (7), a pressure compensator (6) and secondary valves (2).

End valve sectionThe end section is a standard valve section with a single-sided flange surface (without the possibility of extension) and has an additional mounting point.

End plateAlternatively, end plates with optional ports and additional functions are applicable.

▼ Sectional view RS20 with electrohydraulic actuation

1

5

8

7

22

3

4

6

A

P

R1

LS

LXR2

B

1 Valve housing2 Secondary pressure relief valve3 Control spool4 Electrohydraulic actuation

5 Return spring6 Pressure compensator7 Load-holding valve8 Adjustable stroke limiter



Universal inlet, e.g. for excavatorsAll central hydraulic functions are integrated in the inlet. Directional valve sections of the sizes RS20 and RS15 can be flanged here.

Additional functions: ▶ Unloading valve ▶ LS flow control valve / LS drain valve ▶ LS pressure relief valve

(single-stage or electroproportionally variable) ▶ Return flow preload valve ▶ Primary pressure relief valve (pump pressure) ▶ LS damping valve ▶ Pilot oil generation ▶ Pilot oil shut-off

LS1

S

LS2

LS PR2

MP

R2 R1

P

Flange surface for RS20


Inlet with double ports, e.g. for wheeled loadersThis inlet can be extended with RSM20 and RS20 sections. The first RS20 ADV section mounted to the inlet is internally connected to the replicated ports A' and B' as well as to the stabilizing module (RSM20).A stabilizing module (RSM20) can be mounted directly on the RS15 flange face, providing a fully integrated solution with internal interconnections to the work ports A and B, the pump channel and the return flow. For further information on the RSM20, see data sheet 64628.

Additional functions: ▶ Unloading valve ▶ LS flow control valve / LS drain valve ▶ Regeneration check valve (anti-cavitation valve) from

return line to rod side ▶ LS pressure relief valve

(single-stage or electroproportionally variable) ▶ Return flow preload valve

(optional electroproportionally variable) ▶ LS damping valve ▶ Pilot oil generation (optional) ▶ Pilot oil shut-off (optional)

P

R

LS2

LS1

L

X

X'

B'

A'

LSB'A' PR2


Flange surface for RSM20


5 Control block | RS20 Modular system

LUDV sectionThe LUDV section contains a pressure compensator downstream of the metering orifice and two large load-holding valves. The section flow depends on the ∆p between MP and LS1 at the inlet.Various types of cartridge valves/plugs1) are available on the consumer ports (secondary side).The section can be controlled hydraulically or electrohydraulically. In the case of electrohydraulic actuation, the pilot oil is supplied internally.

PR2 LS R1 L X

a

b

B

A

LUDV section with anti-drift valveThe ADV section is an extended LUDV section. Between the consumer port (A and/or B) and the control spool, an unlockable check valve (ADV valve) is installed to shut off the consumer.The ADV option is available on A, B or on both sides.

A special variant of the ADV section is the version with an additional A and B port in the flange surface (e.g. for wheeled loaders, dozers). In combination with the special wheeled loader inlet, double ports (A', B') can be implemented in the inlet (for an example, see page 9).

PR2 LS R1 L XB‘A‘

a

b

B

A

optional

LS sectionThe LS section has the same flange face as the LUDV section and therefore can be located freely within the RS20 stack. The pressure compensator is connected upstream of the metering orifice and operates independently of the ∆p between MP and LS1 at the inlet. This functional principle ensures semi-prioritisation of the consumer connected to the LS section (e.g. slew drive).Within the LS section, the LS pressure can be set individually (independent of the system pressure). In addition, the LS pressure relief valve can be adjusted electroproportionally.In hydraulic systems, but also as an option in the electrohydraulic system, the proven hydraulic torque control DTS can be implemented.Various cartridge valves/plugs1) can also be installed on the secondary side, in case the LS section is used as an auxilliary section.

PR2 LS R1 L X

a

a/b

L1

b

B

A

1) For options, see page 6



Bypass priority module RBM15An RBM15 can be mounted directly on the RS15 flange face in order to supply the priority consumer (e.g. steering) with flow.

▶ Only one pump required for supplying steering system and implement hydraulics

▶ The flow is available in parallel to the working hydraulics and steering with low pressure losses

▶ The prioritization of the steering is carried out indirectly via the pressure in the CLS connection that closes the LUDV pressure compensators in the working hydraulics.

▶ In contrast to standard full-flow priority solutions, the bypass priority module avoids additional pressure losses on the pump flow as long as the pump is able to saturate the total flow requirement of all consumers, which results in a significantly improved energy efficiency.

NoticeThe functional principle cannot be used for all configurations! Please consult your sales representative.

P3LSR

C

CLS

Configuration optionsType of actuation1)

▶ Hydraulic ▶ Electrohydraulically proportional

(pressure reducing valve FTDRE4K) ▶ Electrohydraulically switchable

(directional spool valve FTWE4K)

Options for secondary valves2)

▶ Pressure limitation / anti-cavitation valve VMR2 ▶ Proportional pressure relief valve KBVS.2DB ▶ Anti-cavitation valve VUR2 ▶ Threaded plug ▶ Other valves, suitable for mounting cavity "FC",

on request

Options for ADV valve position3)

▶ Unlockable check valve (ADV valve) ▶ Other valves on request.

Further options ▶ Measuring ports for pump (MP), load-sensing (LS1) ▶ Measuring ports for pilot control ▶ Section flow adjustment via stroke limiter ▶ Spool position sensor PSM, see data sheet 95190

PR2 LS R1

FTDRE4

VMR2 KBVS.2DB MHSV

ADV

FTWE4

L X

a

b1)

1)

2)

3)

2)

3) B

A

Threaded plug


7 Control block | RS20 Technical data

Technical data

General

Weight (approx.)1) Universal inlet kg 23

Inlet with double ports kg 35

LUDV section kg 15.5

LUDV section with ADV kg 21

LS section kg 18.5

Installation position See page 12

Consumer ports Flange ports according to DIN EN ISO 6162, see page 11

Ambient temperature range ϑ °C –30 … +100

Priming Single-layer coat paint RAL 5010 (standard)Further colors and dual-layer coat paint on request

Hydraulic

Maximum working pressure at port2)

P pmax bar 400

A, B pmax bar 420

R1, R2, T p bar 30

LS p bar 380

L p bar depressurized

S p bar 30

Maximum pilot oil pressure at port

X p bar 40

a, b p bar 40

Flow at port

P qv nom l/min 400, higher flows on request

A, B qv max l/min 300 for LUDV section220 for LS section

A, B → R qv max l/min 600

Hydraulic fluid Mineral oil (HL, HLP) according to DIN 51524, see data sheet 90220. Other hydraulic fluids on request, e.g. environmentally acceptable fluids per ISO 15380 as specified in data sheet 90221.

Hydraulic fluid temperature range ϑ °C –30 … +100

Maximum permissible temperature difference between Control block and hydraulic fluid

∆Tmax K 20

Viscosity range Cold start ν mm²/s 380 … 2000

Warm-up phase ν mm²/s 100 … 380

Recommended range3) ν mm²/s 20 … 100

Permissible range4) ν mm²/s 10 … 380

Maximum admissible degree of contamination of hydraulic fluidCleanliness level per ISO 4406 (c)

Class 20/18/15, we recommend a filter with a minimum retention rate of β10 ≥ 75

1) The weight is configuration-specific and may vary by several kilograms.

2) The maximum working pressure depends on the connection fitting used and the combination with RS15 directional valves.

3) Any operation outside the recommended range results in restrictions.

4) This corresponds, for example on the VG 46, to a temperature range of +5 °C to +85 °C.


8 RS20 | Control blockTechnical data

Electric

Electrical pilot control valves FTDRE4K...; see data sheet 58038

Connector version DT04-2P (DEUTSCH)(Optional: Junior timer, 2-pin (AMP))

Type of protection according to ISO 20653

Connector version Junior timer (AMP) IP6K55)

IP6K7 and IP6K9K 5) (only with Rexroth type R901022127)

Connector version DT04-2P (DEUTSCH) IP6K5, IP6K7 and IP6K9K 5)

Recommended amplifier Analog amplifier RA, see data sheet 95230

Recommended control unit BODAS controllers RC

Notice ▶ For applications outside these values,

please consult us! ▶ The technical data was determined at a viscosity

of ν = 32 mm2/s (HLPD32; ϑoil = 40±5 °C).

5) With installed and locked plug-in connector. Plug-in connectors are not included in the scope of delivery and must be ordered separately, see data sheet 08006.


9 Control block | RS20 Example configurations

Example configurations

▼ Example 1: Wheeled loader, inlet with double ports

RS

20

LUD

V en

d s

ecti

onR

S20

LU

DV

sect

ion

RS

M20

Sta

bili

zing

mod

ule

(see

dat

a sh

eet

6462

8)

Inle

tR

S20

AD

V se

ctio

n 12

13

123

6

7

10

4

11

5

a

9

8

b

B

A

a

b

B

A

a

b

B

A

X2

HEAD

RODLS PR2

P

R

LS2

LS1

L

X

X'

B'

A'

Inlet functions1 Unloading valve2 LS flow control valve / LS drain valve3 Regeneration check valve (anti-cavitation valve)4 LS pressure relief valve (VMD1.025)5 Pilot oil generation (MHDRDB)6 Pilot oil shut-off (optional)7 Electroproportional reservoir preload valve

Directional valve functions8 Control spool9 Load-holding valve10 LUDV pressure compensator11 Unlockable check valve (anti-drift valve)12 Electrohydraulic pilot control (FTDRE4)13 Secondary pressure relief valve (VMR2)

Ports

P Pump port

R Return port

A, B Consumer port

a, b Pilot oil port

LS1, LS2 Load-sensing port

S Suction port

X Pilot oil supply port

L Drain port


10 RS20 | Control blockExample configurations

▼ Example 2: Excavator, with universal inlet

T4 P4 LS4

B

A

ba

a

b

B

A

a

b

B

A

P3

C

CLS

a

a/b

L1

b

B

A

LS1

S

LS2

MP

R2 R1

P

T4 P4 LS4

B

A

ba

a

b

B

A

a

b

B

A

P3

C

CLS

LS

S

MLS

MP

L

X

R2 R1

P

a

a/b

L1

b

B

A

X

L

8

7

6

3

15

16

10

11

4

9

12

13

14

1

5

2

17

RS

20

End p

late

RS

20

LS s

ecti

onIn

let

RS

20

LUD

V se

ctio

nR

S20

LU

DV

sect

ion

RS

15

LUD

V se

ctio

n(s

ee d

ata

shee

t 64

134)

RB

M15

B

ypas

s pri

orit

y m

odul

e

Inlet functions1 Unloading valve2 LS flow control valve / LS drain valve3 LS pressure relief valve (VMD1.025)4 Preload valve5 Primary pressure relief valve

Directional valve functions6 Control spool7 Load-holding valve8 LUDV pressure compensator9 Unlockable check valve (anti-drift valve)10 Electrohydraulic pilot control (FTDRE4)11 Secondary pressure relief valve (VMR2)12 LS pressure compensator13 Copy valve14 Torque control DTS

RBM functions15 Priority pressure compensator16 LS pressure limitation of the parallel consumer17 Priority logic (for closing LUDV pressure compensators with

pump pressure)

Ports

P Pump port

R1, R2 Return port

T Return port (not preloaded)

A, B Consumer port

a, b Pilot oil port

LS Load-sensing port

S Suction port

L1 Drain port

MP Pump measuring port

C Priority consumer port

CLS Load-sensing port for prioritized parallel consumer


11 Control block | RS20 DimensionsDimensions [mm]

Dimensions

NoticeIndividual dimensions, see offer drawing.

Flange portsSimilar to DIN EN ISO 6162-2

Port Min. thread depth L2

P, P4 DN25 (SAE 1 in) 6000 PSI 23 Pump port

P3 DN19 (SAE 3/4 in) 6000 PSI 15.5 Pump port

R, R1, R2 DN32 (SAE 1 1/4 in) 3000 PSI 15.5 Return port

A, B, A', B' DN19 (SAE 3/4 in) 6000 PSI 15.5 Consumer port

optional: DN25 (SAE 1 in) 3000 PSI 15.5

C DN19 (SAE 3/4 in) 6000 PSI 15.5 Priority consumer port

Line connectionsAccording to DIN EN ISO 1179-1 (BSP) or DIN EN ISO 11926-1 (UNF)

Port BSP UNF

a, b G 1/4 9/16-18 UNF-2B Pilot oil port

LS, LS1…4 G 1/4 9/16-18 UNF-2B Load-sensing port

CLS G 1/4 9/16-18 UNF-2B Load-sensing port for prioritized parallel consumer

S G 3/4 1 1/16-12 UN-2B Suction port

X G 3/8 3/4-16 UNF-2B Pilot oil supply port

L G 3/8 3/4-16 UNF-2B Drain port

L1 G 1/4 9/16-18 UNF-2B Drain port

MP G 1/4 9/16-18 UNF-2B Measuring port

Electric ports

Port

a, b DT04-2P (DEUTSCH)(Optional: Junior timer, 2-pin (AMP))

Electrohydraulic pilot control (FTDRE4)

t Reservoir preload valve

r On/off RSM20


12 RS20 | Control blockRecommended installation position

Recommended installation position

See the following examples 1 to 4.Further installation positions are available upon request.

Installation position

17° 7°7° 7°

27° 7°7° 7°

37° 7°7° 7°

47° 7° 7° 7°


13 Control block | RS20 Related documentation

Related documentation

Product-specific documentation

Document type Title Document number

Data sheet Flow sharing control block RS – Flexibly configurable valve platform for mobile working machines

64141

Instruction manual Control blocks for mobile applications 64025-B

Repair manual Basic information on control block RS20 64137-01-R

Control block assembly RS20 64137-10-R

Documentation for mounted components


Data sheet Flow sharing control block in sandwich plate design RS15 64134

Stabilizing module RSM20 64628

Directional spool valve FTWE4K 58008

Pressure limitation / anti-cavitation valve VMR2 18318-38

Anti-cavitation valve VUR2 18319-02

Proportional pressure relief valve KBVS.2DB 18377

Proportional pressure reducing valve FTDRE4K 58038

Spool position sensor PSM 95190

Plug-in connectors and cable sets for valves and sensors 08006

Documentation for control components


Data sheet BODAS controller RC4-5/30 95205

BODAS controller RC5-6/40 95207

BODAS controller RC10-10/31 95206

BODAS controller RC28-14/30, RC20-10/30, RC12-10/30 95204

Documentation for hydraulic fluids


Data sheet Hydraulic fluids based on mineral oils and related hydrocarbons

90220


Bosch Rexroth AGZum Eisengießer 197816 Lohr am MainGermanyTel. +49 9352 [email protected]

© Bosch Rexroth AG 2021. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights. The data specified within only serves to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging.

14 RS20 | Control block

Documents

Flow sharing control block in sandwich plate design RS20