1/10

Information on available spare parts: www.boschrexroth.com/spc

Proportional pressure reducing valve, direct operated

Type MHDRE 02 K

Size 2Component series 1XMaximum control pressure 30 barMaximum flow 2.5 l/min

RE 64658/02.10

Table of contents Features

– Direct operated proportional pressure reducing valve for reducing a system pressure

– Installation valve– Suitable for mobile and industrial applications– Operation by means of proportional solenoid– In case of power failure, the minimum pressure is set– Recommended control electronics:

• Mobile amplifier type RA and RC

Content PageFeatures 1Ordering code 2Standard types 2Symbol 2Function, section 3Technical data 4, 5Characteristic curves with tolerance band 6Admissible working range 7Unit dimensions 8Installation bores 9Available individual components 10

H7457

InhaltTable of contents 1Features 1Ordering code 2Standard types 2Symbol 2Function, section 3Technical Data (For applications outside these parameters, please consult us!) 4Technical Data (For applications outside these parameters, please consult us!) 5Characteristic curves with tolerance band (measured with HLPD46, ϑoil = 50 ± 5 °C) 6Admissible working range: 7Unit dimensions (dimensions in mm) 8Installation bores (dimensions in mm) 9Available individual components 10Notes 11Notes 12

2

1

3

2/10 Bosch Rexroth AG Hydraulics MHDRE 02 RE 64658/02.10

Ordering code

MHDRE 02 K 1X A V *

1) Mating connectors (order separately) see data sheet 08006

Proportional pressure reducing valve, direct operated

Size 2 = 02Installation valve = KComponent series 10 to 19 = 1X (10 to 19: unchanged installation and connection dimensions)Maximum control pressure 18 bar = 18Maximum control pressure 30 bar = 30Proportional solenoid, wet-pin = A

Further details in the plain textSeal material

V = FKM seals(other seals upon request)

Attention! Observe compatibility of seals with

hydraulic fluid used!Electrical connection 1)

K40 = without mating connector with connector DT 04-2P (Deutsch plug)

Nominal voltage G12 = DC 12 V G24 = DC 24 V

Standard types

Symbol

TypeMaterial number

12 V 24 VMHDRE 02 K1X/18AG .. K40V R901123950 R901123965MHDRE 02 K1X/30AG .. K40V R901048962 R901048970

① = Main port 1 (A)② = Main port 2 (P)③ = Main port 3 (T)

1 2

23

1

Hydraulics Bosch Rexroth AGRE 64658/02.10 MHDRE 02 3/10

Function, section

Basic principleThe valve controls the pressure in the main port ① propor-tionally to the current at the solenoid. The proportional solenoid (1) converts the electric current into mechanical force that acts on the spool (2) via the armature. The spool controls the connection between the main ports.

Note!Occurring tank pressure (main port ③) is added up to the control pressure (main port ①).

Attention!If the valve is not installed or installed in a system that is not completely bled, the valve must not be energized as other-wise, the entering air has a very negative effect on the valves' dynamic behavior.

GeneralThe proportional pressure reducing valve type MHDRE 02 K is a direct operated installation valve in 3-way design. It re-duces the control pressure (main port ①) proportionally to the solenoid current and functions largely independently from the input pressure (main port ②).With a command value of 0 or in case of power failure, the minimum pressure is set. Operation is effected by means of proportional solenoid. The solenoid's interior is connected to the main port ③ and filled with hydraulic fluid.Depending on the electric command value, these valves can be used to reduce the system pressure continuously. The valve is suitable for controlling couplings, pumps and directional valves as well as for use in proportional pilot controls (particularly in the mobile area, however also for industrial applications).

① = Main port 1 (A)② = Main port 2 (P)③ = Main port 3 (T)

4/10 Bosch Rexroth AG Hydraulics MHDRE 02 RE 64658/02.10

Technical Data (For applications outside these parameters, please consult us!)

1) Attention! The specified value describes only the capabil-ity of the valve. In addition, the capability of the selected mounting clip must be observed:

Mounting clip “50” and fastening screw ISO 4762 - M5 x 14 - 8.8 (separate order), see page 10.

2) The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration pre-vents faults and at the same time increases the service life of the components.

For the selection of filters, see data sheets 50070, 50076, 50081, 50086, 50087 and 50088.

generalWeight kg approx. 0.24Installation position Any - if it is ensured that no air can collect upstream the

valve. Otherwise, we recommend suspended installation of the valve (electric connection downwards).

Ambient temperature range °C See “admissible working range” page 7Storage temperature range °C –30 to +80

Environmental audits:Salt spray test according to EN ISO 9227 h 600 (NSS test)Surface protection Solenoid Coating according to DIN 50962-Fe//ZnNi with thick layer

passivation

hydraulicMaximum control pressure – Main port ① bar 18; 30Maximum input pressure – Main port ② bar 50 (with mounting clip “50”) 1)

Maximum backpressure – Main port ③ bar At zero pressure (max. 3 bar with mounting clip “50”; occur-ring tank pressures are added up to the control pressure (main port ①)) 1)

Maximum flow (∆p = 7 bar) l/min 2.5Maximum leakage – Main port ③ ml/min 100 (50 bar in ②; I = 0 mA, 46 cSt)Maximum pilot oil ml/min 250 (50 bar in ②; I = Imax, 46 cSt)Hydraulic fluid Mineral oil (HL, HLP) according to DIN 51524;

other hydraulic fluids upon requestHydraulic fluid temperature range °C –30 to +110Viscosity range mm2/s 5 to 400Maximum permitted degree of contamination of the hydraulic fluid - cleanliness class according to ISO 4406 (c)

Class 20/18/15 2)

Hysteresis (within tolerance band) bar ≤ 1.5Step response (Tu + Tg) 0 % → 100 %; 100 % → 0 %

ms ≤ 60 (50 bar in ②; 46 cSt, qV = 0 l/min, dead volume in ① 140 cm3)

Repeatability % < 2 % of the maximum control pressureLoad cycles 107

Mesh size strainer element at the main port ② µm 160

For more information refer to data sheets:– 07008 – 07800 – 07900 – 64020

Hydraulics Bosch Rexroth AGRE 64658/02.10 MHDRE 02 5/10

Technical Data (For applications outside these parameters, please consult us!)

electricalSupply voltage V 12 DC 24 DCMaximum control current A 1.7 0.95Coil resistance at 20 °C Ω 3.5 11.1Duty cycle (ED) 3) % See “admissible working range” page 7Maximum coil temperature 4) °C 185Protection class according to VDE 0470-1 (DIN EN 60529), DIN 40050-9

IP 69K (with mating connector mounted and locked)

Chopper frequency (recommended) 5) Hz 150Control electronics (separate order) Control unit RA, see data sheet 95230

Control units RC, see data sheet 95200Design according to VDE 0580

Note!– The technical data were determined at a viscosity of ν = 46 mm²/s (HLP46; 40 °C).

– You can find more information on the correct use of hydrau-lic products of Rexroth in the data sheet 64020-B, “Hydrau-lic valves for mobile applications - General information”.

3) In case of use at an altitude of more than 2000 m a.s.l., we recommend consulting the manufacturer.

4) Due to the temperatures occurring at the surfaces of the solenoid coils, the standards ISO 13732-1 and EN 982 need to be adhered to!

5) The chopper frequency is to be optimized depending on the application. In this regard, observe the temperature range of the application.

0,2 0,4 0,6 0,8 1 1,2 1,4 2

0,95

(0,6)12 V24 V

2

0

4

6

8

101214

16

18

2120

1,6 1,8(1,7)

0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8

0,2 0,4 0,6 0,8 1 1,2 1,4 2

2

0

4

6

8

101214

16

1820

1,6 1,8

22

24

26

2830

32

34

0,95

(0,6)12 V24 V

(1,7)

0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8

6/10 Bosch Rexroth AG Hydraulics MHDRE 02 RE 64658/02.10

Characteristic curves with tolerance band (measured with HLPD46, ϑoil = 50 ± 5 °C)

Control current in A →

Control current in A →

Set p

ress

ure

at th

e

mai

n po

rt ①

in b

ar →

Set p

ress

ure

at th

e

mai

n po

rt ①

in b

ar →

Control pressure 18 bar

Control pressure 30 bar

Measuring conditions:

Amplifier: Analog amplifier RA (data sheet 95230)

Chopper frequency: 150 HzInput pressure: 50 barDead volume at the main port ①: 135 ml

1

0-10 0 10 30 50 70 90 110

1

-20 20 40 60 80 100-3060

80

100

2

3

4

5

6

7

8

9

10

11

12

2

3

70

90

110

120

1,2

1,3

1,4

1,5

1,6

1,7

2

0-10 0 10 30 50 70 90 110

1

-20 20 40 60 80 100-3060

80

100

4

6

8

10

12

14

16

18

20

22

24

2

3

70

90

110

120

0,7

0,75

0,8

0,85

0,9

0,95

1

Hydraulics Bosch Rexroth AGRE 64658/02.10 MHDRE 02 7/10

Admissible working range:

Ambient temperature in °C →

Ambient temperature in °C →

(3) A

dmiss

ible

con

tinuo

us a

pplic

atio

n of

cur

rent

in

A w

ith 1

00 %

ED →

(3) A

dmiss

ible

con

tinuo

us a

pplic

atio

n of

cur

rent

in

A w

ith 1

00 %

ED →

(2) R

elat

ive d

uty

cycle

ED

for I

max

(1.7

A)

in %

→(2

) Rel

ative

dut

y cy

cle E

D fo

r Im

ax (0

,95

A)

in %

→

(1

) Req

uire

d m

inim

um v

olta

ge a

t the

coi

l in V

→

(1) R

equi

red

min

imum

vol

tage

at t

he c

oil in

V →

Admissible working range against the ambient temperatureVersion “G12” (DC 12 V)

Admissible working range against the ambient temperatureVersion “G24” (DC 24 V)

12f7

14±0,3

16f7

17,45±0,04

22-0,2

30±0,3

LS

3+0,

1 7,3±

0,2

3,5±

0,2

14,2

±0,2

27,3

±0,3

55,4

±0,5

26,6

±0,3

1

18,5-0,2

28±0,3

29,5 20,5

3,92

8/10 Bosch Rexroth AG Hydraulics MHDRE 02 RE 64658/02.10

Unit dimensions (dimensions in mm)

1 Mating connector for connector “K40” (separate order, see data sheet 08006)

2 Mounting clip “50” and fastening screw ISO 4762 - M5 x 14 - 8.8 – to 30 bar (separate order), see page 10

① = Main port 1 (A)② = Main port 2 (P)③ = Main port 3 (T)LS = Location shoulder

2,4+

0,1

10±0

,1

min

18,

5 1)

20,3±0

,1

22,8±0

,1

min

28

1)

min

29

B0,0025- / Pt 10

60

1520

2045

17,5+0,05

A0,05

19,8+0,1

22,5±0,2

min 32

B0,02

min 312H816H8

A

A0,02

A

A

-0,1 +0,4Rz 8

LS0

10+2

12+3

min 29

3,8

3,8

5,5±

0,1

17±0

,1

Rz 8

min 45

M5

90

R0,1

+0,1

-0,2

+0,1

20,5±0,08

2,9 -

0,1

Hydraulics Bosch Rexroth AGRE 64658/02.10 MHDRE 02 9/10

Installation bores (dimensions in mm)

1 = Main port 1 (A)2 = Main port 2 (P)

③ = Main port 3 (T)LS = Location shoulder1) Depth of fit

Standards:

Workpiece edges DIN ISO 13715Form and position tolerance DIN EN ISO 1101General tolerances for metal-cutting procedures

DIN ISO 2768-mK

Tolerance DIN ISO 8015Surface quality DIN EN ISO 1302

Cut A – A, mounting clip “50”

Bosch Rexroth AG HydraulicsZum Eisengießer 197816 Lohr am Main, Germany Phone +49 (0) 93 52 / 18-0 Fax +49 (0) 93 52 / 18-23 58documentation@boschrexroth.de www.boschrexroth.de

© This document, as well as the data, specifications and other informa-tion set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent.The data specified above only serve to describe the product. No state-ments concerning a certain condition or suitability for a certain applica-tion 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.

10/10 Bosch Rexroth AG Hydraulics MHDRE 02 RE 64658/02.10

Available individual components

999

A

B

Item Description Material no.999 Seal kit of the valve (for 2 valves) R961003681A Mounting clip “50” (Maximum input pressure 50 bar) R908105638B Hexagon socket head cap screws ISO 4762 - M5 x 14 - 8.8 (mounting clip “50”) 2910141156

Bosch Rexroth AG HydraulicsZum Eisengießer 197816 Lohr am Main, Germany Phone +49 (0) 93 52 / 18-0 Fax +49 (0) 93 52 / 18-23 58documentation@boschrexroth.de www.boschrexroth.de

© This document, as well as the data, specifications and other informa-tion set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent.The data specified above only serve to describe the product. No state-ments concerning a certain condition or suitability for a certain applica-tion 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.

Hydraulics Bosch Rexroth AGRE 64658/02.10 MHDRE 02 11/10

Notes

Bosch Rexroth AG HydraulicsZum Eisengießer 197816 Lohr am Main, Germany Phone +49 (0) 93 52 / 18-0 Fax +49 (0) 93 52 / 18-23 58documentation@boschrexroth.de www.boschrexroth.de

© This document, as well as the data, specifications and other informa-tion set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent.The data specified above only serve to describe the product. No state-ments concerning a certain condition or suitability for a certain applica-tion 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.

12/10 Bosch Rexroth AG Hydraulics MHDRE 02 RE 64658/02.10

Notes