MHDB / MHSV 1/12
Special note:
• When exchanging valve cartridges, take note of the correct tightening torque!
• The setting of given pressure values is achieved at:
– direct operated pressure valves at a flow of 2 to 3 L/min
– pilot operated pressure valves at a flow of 10 L/min.
• Maximum permissible degree of contamination of the fluid is to NAS 1638 class 9.
We, therefore, recommend a filter with a minimum retention rate of ß
10
≥ 75.
P
T
pst
P
T
P
T
pst
P
T
pst
T
A, B
P
T
(A, B)
P
T
Pressure relief and anti-cavitation valves
(cartridge type)
for mobile applications
Nominal sizes 10 to 40
Maximum operating pressure 420 bar
Maximum flow 680 L/min
H/A 3022
Features
– Pressure valves protect the pump and or actuator as well as the
system against over pressure
– Anti-cavitation valves prevent filling problems and, therfore,
cavitation during actuator movements that are caused by load
influences
– Pressure and anti-cavitation valves are available as valve
combinations for fitting into hydraulic components, manifolds or
line mounting
– Various versions (direct actuated, pilot operated and hydraulic
unloading)
Depending on their design, pilot operated pressure relief valves are
either leak-free or subject to leakage and, depending on type, allow
pilot oil to flow to tank before the set pressure is reached. Used mainly
for services with loads below the primary pressure of a directional
control valve block, and for hydraulic motors.
Pressure relief valve,
direct operated
Direct operated valves seal free of leakage and are used mainly as
cylinder safety valves.
Inexpensive and space saving alternative to individual valves.
Oil lost through leakage or operation of pressure relief valves is
replaced by anti-cavitation valves. Their cracking pressure is normally
above 0.5 bar, therefore, the inlet pressure must be higher than the
atmospheric pressure.
Pressure relief valve,
pilot operated
with pressures
sequence stage
Anti-cavitation valve
Combined pressure relief/
anti-cavitation valve,
pilot operated
with pressure sequence
stage
or pressure cut-off stage
Description and application, symbols
pilot operated with pressure cut-off stage
Contents
Description Page
Features 1
Description and application, symbols 1
Ordering details 2, 4, 11 and 12
Unit dimensions 3 and 5
Cavities 6 and 7
Characteristic curves 6 to 11
RE 64 642/04.00
Replaces: 09.98
RE 64 642/09.98
with pressure sequence stage
RE 64 642/12.97
Rexroth Hydraulics 2/12 MHDB / MHSV
P
T
X
P
T
T
A, B
P
T
(A, B)
P
T
Ordering details
Installation
cavity,
see
pages 6 & 7
Char.
curves,
see
pages
7 to 11
± 10
Nm
Seal kit
M = NBR
V = FPM
Material
no.
For control block
Tightening
torque
DesignationValve type, symbols
Pressure relief M1-16 502051 MHDBD 10 K2-1X/050M 309720M 90 D1 FB
valve, SM12 365729 MHDBD 10 K2-1X/100M 309720M 90 D1 FB
direct operated SP12 394225 MHDBD 10 K2-1X/100V 309602V 70 D1 FB
MHB10S 360331 MHDBD 10 K2-1X/200M 309720M 70 D1 FB
394226 MHDBD 10 K2-1X/200V 309602V 90 D1 FB
364462 MHDBD 10 K2-1X/315M 309720M 90 D1 FB
394227 MHDBD 10 K2-1X/315V 309602V 90 D1 FB
362701 MHDBD10 K2-1X/420M 309720M 90 D1 FB
389255 MHDBD10K2-1X/420V 309602V 90 D1 FB
M2-10 368719 MHDBD 10 K2-1X/100M-017 309539M 50 D1 FA
355146 MHDBD 10 K2-1X/200M-017 309539M 50 D1 FA
353767 MHDBD 10 K2-1X/315M-017 309539M 50 D1 FA
M1-22 316256 MHDBD 22 K2-1X/315M 309509M 150 D7 FG
316257 MHDBD 22 K2-1X/200M 150 D7 FG
Pressure relief M2-10 497855 MHDBV 10 K2-1X/315M-017 309539M 50 D8 FA
valve, 334901 MHDBV 10 K2-1X/315V-017 309535V 50 D8 FA
pilot operated MO-10 342180 MHDBV 16 K2-1X/100M 309523M 90 D4 FB
M1-16 339308 MHDBV 16 K2-1X/420M 309523M 90 D4 FB
SM12; SP12
MO-16/22 304674 MHDBV 22 K2-1X/420YM 309625M 80 D2 FD
M1-16/22/32 307482 MHDBV 22 K2-1X/420 YV 309675V 80 D2 FD
MO-32/40 307942 MHDBV 40 K2-1X/420YM 309657M 300 D3 FL
406620 MHDBV 40 K2-1X/420YVFL 309564V 300 D3 FL
Pressure relief MO-16/22 307480 MHDBV 22 K2-1X/420XYM 309639M 80 D2 FD
valve M1-16/22/32 453925 MHDBV 22 K2-1X/420XYV 309685V 80 D2 FD
pilot operated, MO-32/40 308696 MHDBV 40 K2-1X/420XYM 309689M 300 D3 FL
unloadable 382742 MHDBV 40 K2-1X/420XYV 309564V 300 D3 FL
Anti-cavitation value M8-16/18 936509 MHSV 16 KB1-2X/VFH 309551V 100 FH
SP08; MO-10; M1-16 936508 MHSV 16 KB1-2X/VFB 309546M 90 N1 FB
SM12; SP12 70 N1 FB
M8-22/25; M7-1X; SX18 936725 MHSV 22 KB1-2X/VFC 309598
1)
100 N2 FC
SM18; SP18; M5–20
1)
100 N2 FC
M1-22 316265 MHSV 22 KB1-1X/M 309500M 150 N4 FG
M7-22-2X 936888 MHSV 22 KB1-2X/VLG 100 LG
M1-32; M8-32 936726 MHSV 32 KB1-2X/VFK 309721V 150 N3 FK
M5-25/32 150 N3 FK
Relief/anti-cavitation M8-16/18 936469 MHDBN 16 K2-2X/420VFH 100 FH
valve, MO-10; SP08 936468 MHDBN 16 K2-2X/100VFB 309550V 90 D4/N1 FB
pilot operated, M1-16; M4-15 936467 MHDBN 16 K2-2X/420VFB 309550V 90 D4/N1 FB
SM12; SP12 70 D4/N1 FB
M8-22/25; M7-1X; SX18 936834 MHDBN 22 K2-2X/100VFC 309598V
1)
100 D5/N2 FC
SM18; SP18; M5-20 936718 MHDBN 22 K2-2X/420VFC 309598V 100 D5/N2 FC
M1-22 936870 MHDBN 22 K2-2X/350VFG 150 D9/N5 FG
M7-22-2X 936719 MHDBN 22 K2-2X/420VLG 100 LG
M1-32 936882 MHDBN 32 K2-2X/100VFK 309559V 150 D6/N3 FK
M5-25/32 936722 MHDBN 32 K2-2X/420VFK 309559V 150 D6/N3 FK
M8-32 150 D5/N3 FK
1)
70 Nm by types SM18 / SP18 / SX18
RE 64 642/04.00
MHDB / MHSV 3/12 Rexroth Hydraulics
RE 64 642/12.97
SW
L2 L1
T
(A, B)
P
A, B
T
24,5 61,5
SW19
21,5 47
SW24
T
P
(A, B)
24,5 42,6
SW19
T
P
(A, B)
31 46
SW24
T
P
(A, B)
47
T
P
21,5
L2
A, B
T
L1
SW
P
T
P
Y
X
T Y
L1L2
SW
L2
32,9
38
T
(A, B)
P
Unit dimensions (Dimensions in mm)
Type MHDBD 10 K.../...
Type MHDBD 10 K.../...-017
Type MHDBD 22 K.../...
Pressure relief valve, direct operated
Type MHDBV 10 K.../...-017
Type MHDBV 16 K.../...
unloadable
Type L1 L2 A/F
MHDBV 22 K.../..Y 27 65 30
MHDBV 40 K.../..Y 30 76 36
MHDBV 22 K.../..XY 27 65 30
MHDBV 40 K.../..XY 30 76 36
Pressure relief valve,
pilot operated and
pilot operated, unloadable
Type MHSV 22 K.../...
Anti-cavitation valve
Type L1 L2 A/F
MHSV 16 K.../... 47 24.3 22
MHSV 16 K.../..FH 24.4 35 22
MHSV 22 K.../..FC 31.6 31.5 27
MHSV 22 K.../..LG 29.3 38.5 28
MHSV 32 K.../... 33.7 36 32
MHDBV 40 K.../..XY 30 76 36
Type MHDBN 22 K.../350.
Relief/anti-cavitation valve,
pilot operated
Type L1 L2 A/F
MHDBN 16 K.../... 47 24.3 22
MHDBN 16 K.../..FH 52.3 35 19
MHDBN 22 K.../..FC 48.1 35.5 27
MHDBN 22 K.../..LG 52.1 38.5 28
MHDBN 32 K.../... 50.2 40.9 32
24 A/F
19 A/F
24 A/F
19 A/F
A/F
A/F
A/F
RE 64 642/12.97
Rexroth Hydraulics 4/12 MHDB / MHSV
P
T
pst
P
T
pst
P
T
pst
Pressure relief MO-16/22 307944 MHDBH 22 K9-1X/420YM 309662M 80 D2 FD
valve, M1-16/22/32
pilot operated MO-32/40 408463 MHDBH 40 K9-1X/420YM 309699M 300 D3 FL
with pressure
sequence stage,
hydraulically actuated
Relief/anti-cavitation
M8-16/18 936676 MHDBB 16 K9-2X/420VFH01 – FH
valve, pilot operated M1-16 936672 MHDBB 16 K9-2X/420VFB01 – 90 D4/N1 FB
with pressure SM12; SP12 70
sequence stage, M5-20 100
hydraulically actuated M8–22/25 936679 MHDBB 22 K9-2X/420VFC01 – 100 D5/N2 FC
SM18; SP18 70
M7-22-2X 936960 MHDBB 22 K9-2X/420VLG01 – 100 LG
M1-32 936956 MHDBB 32 K9-2X/420VFK01 – 150 D6/N3 FK
M5-25/32
Relief/anti-cavitation
M8-16/18 936657 MHDBL 16 K9-2X/420VFH01 – 100 FH
valve, pilot operated M1-16 936656 MHDBL 16 K9-2X/420VFB01 – 90 D4/N1 FB
with pressure
SM12; SP12 70
cut-off stage, M8-22/25 936680 MHDBL 22 K9-2X/420VFC01 – 100 D5/N2 FC
hydraulically actuated M5–20 100
SM-18/SP-18 70
M1-32 936721 MHDBL 32 K9-2X/420VFK01 – 150 D6/N3 FK
M5-25/32
M8-32
Ordering details
Valve type, symbols
± 10
Nm
DesignationMaterial
no.
Tightening
torque
For control block
Installation
cavity,
see pages
6 and 7
Char.
curves,
see
pages
7 to 11
Seal kit
M = NBR
V = FPM
MHDB / MHSV 5/12 Rexroth Hydraulics
RE 64 642/12.97
L1L2
P
T
pst
SW
G 1/4
L1L2
P
T
pst
SW
(A, B)
G 1/4
L1L2
P
T
pst
SW
(A, B)
G 1/4
Unit dimensions (Dimensions in mm)
Pressure relief valve, pilot operated with pressure sequence stage, hydraulically actuated
Relief/anti-cavitation valve, pilot operated with pressure cut-off stage, hydraulically actuated
Relief/anti-cavitation valve, pilot operated with pressure sequence stage, hydraulically actuated
Type L1 L2 A/F
MHDBH 22 K9-1X/420YM 61 65 30
MHDBH 40 K9-1X/420YM 61 76 36
Type L1 L2 A/F
MHDBL 16 K9-2X/420VFB01 117.5 24.5 24
MHDBL 16 K9-2X/420VFH01 111.4 35 24
MHDBL 22 K9-2X/420VFC01 114.9 35.5 30
MHDBL 32 K9-2X/420VFK01 114.6 40.9 34
Type L1 L2 A/F
MHDBB 16 K9-2X/420VFB01 84.8 24.3 24
MHDBB 16 K9-2X/420VFH01 90.4 35 24
MHDBB 22 K9-2X/420VFC01 82.2 35.5 30
MHDBB 22 K9-2X/420VLG 88.9 38.5 22
MHDBB 32 K9-2X/420VFK01 81.9 40.9 34
A/F
A/F
A/F
RE 64 642/12.97
Rexroth Hydraulics 6/12 MHDB / MHSV
Ø 28,5
+0,1
31
+0,1
y
M30 x 1,5
Ø 31
H8
45
°
A
A0,02
A
0,02
20°
x
7,5
2
10°
x
Ø 26,5
Ø 40
25
9
M28 x 1,5
Ø 22,5
H8
y
y
35
Ø 29
H8
Ø 26,5
Ø 24
Ø 21
H8
Ø 32
19
12
28
+0,2
8
2,5
10°
A
P
A0,03
y
y
y
20°
y
20°
y
Y
T
X
B
B
0,03
19
32
±
0,1
56
42
Ø 2
Ø 4
66
20°
FD
FC FL
FB FK
FA
FG
28,8
+0,1
A0,02
Ø 24
H7
y
y
P
T
M33 x 1
Ø 34,5
+0,1
Ø 38
+0,4
Ø 47
A
27
+0,1
26 0,5
12
2,5
+0,1
20°
37
A0,05
45°
15°
y
24,8
±0,2
Ø 22
H7
M28 x 1
Ø 30
+0,1
Ø 33
+0,4
Ø 38
A
23
±0,2
22 0,5
9,5
2,5
+0,1
20°
45°
15°
y
y
y
P
T
32,5
A0,05
A0,02
x
^
=
R
z
16 ;
y
^
=
R
z
8
17,6
H7
22
y
A
A0,02
20°
M24 x 1
Ø 25,6
+0,1
Ø 27
Ø 28
15°
45°
A
0,05
16,4
±
0,2
15
±
0,2
2
+0,1
0,5
+0,1
y
y
y
P
T
6,5
±
0,2
M22 x 1,5
Ø 22,5
H8
Ø 26
Ø 20,5
Ø 16,5
H8
A
Ø 7
(2,5)
30°
0,5
0,8
27
19,5
±0,1
14
5
0,6
A0,05
P
T
1 x 45°
30°
y
A0,02
A0,02
y
y
y
X
X
Ø 2,5
y
M39 x 1,5
B
y
39
B0,03
Ø 40
H8
Ø 30
H8
Ø 28
H8
Ø 41
18
45°
32
+0,2
7
2,5
20°
10°
A
P
T
A0,03
y
y
X
y
20°
y
20°
y
Y
Ø 37,5
Ø 31,5
22
68
65
22
35
±0,1
Ø 6
78
Installation cavity (Dimensions in mm)
M22x1.5
M30x1.5
M24x1 M33x1
M39x1.5
M28x1
M28x1.5
Note regarding surface finishes:
Depth of fit
Kern-Ø
Kern-Ø
Depth of fit
Depth of fit
RE 64 642/04.00
MHDB / MHSV 7/12 Rexroth Hydraulics
RE 64 642/12.97
450
400
0
50
100
150
200
250
300
350
20 30 40 50 60
10
450
400
080
160
400
50
100
150
200
250
300
350
240
320
FH LG
D1
D2
R0,2
23,7
24,7
±0,1
26,5
±0,1
35
36 min
Ø 12
Ø 18
H7
≥ Ø 30
Rz8
A
30
°
30°
Rz16
R0,4
11
2,4
+0,1
0,04 A
0,04 A
R0,2
Rz8
M24x1,5
Ø 27,2
+0,1
Ø 30
Rz16
44,5
Ø 27
H7
0,02
A
M30x1,5
Ø 32
+0,1
Ø 36
+0,2
R
max
8
R
max
8
0,05
A
15°
29
+0,2
3
+0,2
0,5
+0,1
A
45°
20°
R
max
8
Installation cavity (Dimensions in mm)
M24x1.5 M30x1.5
Pressure setting in bar →
Flow in L/min →
Limit of performance
Pressure setting in bar →
Flow in L/min →
Characteristic curves (measured at
ν
= 41 mm
2
/s and
ϑ
= 50 °C)
Depth of fit
Ø 27
H7
Depth of fit 39
RE 64 642/08.95
Limit of performance
RE 64 642/12.97
Rexroth Hydraulics 8/12 MHDB / MHSV
400
0
50
100
150
200
250
300
350
450
40
80
120 160
200
420
160
320
400
0
800
50
100
150
200
250
300
350
450
640
400
0
50
100
150
200
250
300
350
450
30
10 20
40
50 60 70
80 90
100
D4
D5
D3
Characteristic curves (measured at
ν
= 41 mm
2
/s and
ϑ
= 50 °C)
Limit of performance
Pressure setting in bar →
Flow in L/min →
Pressure setting in bar →
Pressure setting in bar →
Limit of performance
Flow in L/min →
Limit of performance
Flow in L/min →
RE 64 642/08.95
MHDB / MHSV 9/12 Rexroth Hydraulics
RE 64 642/12.97
400
080
160
400
50
100
150
200
250
300
350
450
240
320
0
50
100
150
200
250
300
350
20
40
60
10
80
100
120
140
150
400
0
160
50
100
150
200
250
300
350
450
40 200
12080
0
50
100
150
200
250
300
20
40
60
10
30
50
D8
D9
D7
D6
Characteristic curves (measured at
ν
= 41 mm
2
/s and
ϑ
= 50 °C)
Flow in L/min →
Pressure setting in bar →
Limit of performance
Limit of performance
Flow in L/min →
Pressure setting in bar →
Flow in L/min
Pressure setting in bar →
Limit of performance
Pressure setting in bar →
Limit of performance
Flow in L/min →
RE 64 642/08.95
RE 64 642/12.97
Rexroth Hydraulics 10/12 MHDB / MHSV
10
8
6
4
2
0
40
80 120
160
200
240
10
8
6
4
2
0
80
160 240 320
400
10
8
6
4
2
0
20 40
60
80
100
N1
N2
N3
Characteristic curves (measured at
ν
= 41 mm
2
/s and
ϑ
= 50 °C)
Flow in L/min →
Flow in L/min →
Flowin L/min →
Pressure differential in bar →
Pressure differential in bar →
Pressure differential in bar →
RE 64 642/09.86
MHDB / MHSV 11/12 Rexroth Hydraulics
RE 64 642/12.97
*
10
8
6
4
2
02040
60
80
100
120
140 160
180
200
10
8
6
4
2
02040
60
80
100
120
140 160
180
200
N4
N5
Characteristic curves (measured at
ν
= 41 mm
2
/s and
ϑ
= 50 °C)
Ordering details: anti-cavitation valve type MHSV...
Pressure differential in bar →
Pressure differential in bar →
Flow in L/min →
Flow in L/min →
Mobile hydraulics = MH
Anti-cavitation valve = S
Without drain connection = V
Nominal size 16 = 16
Nominal size 22 = 22
Nominal size 32 = 32
Valve version
Cartridge = K
Without pilot control poppet = B
Cracking pressure 0,5 bar = 1
Further details in clear text
SO number (3 digit)
Installation cavity
FB = M24 x 1
FC = M28 x 1
FK = M33 x 1
FH = M24x1.5
FG = M30x1.5
LG = M30x1.5
M = NBR seals suitable for
mineral oil (HL, HLP) to DIN 51 524
V = FKM seals suitable for
phosphate ester (HFD-R)
2X = Series 20 to 29
(20 to 29: unchanged installation and
connection dimensions)
For type MHSV...FG (for cavity „FG“)
1X = Series 10 to 19
(10 to 19: unchanged installation and
connection dimensions)
MH S V K B 1 –
Note:
If valve type differs from those listed on page 2 of the
catalogue sheet, please consult us!
All rights reserved – Subject to revision 12/12 MHDB / MHSV
RE 64 642/12.97
The specified data is for product description
purposes only and may not be deemed to be
guaranteed unless expressly confirmed in the
contract.
Mannesmann Rexroth Limited
Cromwell Road, St. Neots,
Huntingdon, Cambs. PE19 2ES
Tel: (01480) 476041
Fax: (01480) 219052
Mannesmann Rexroth AG
Rexroth Hydraulics
D-97813 Lohr am Main
Jahnstraße 3-5 • D-97816 Lohr am Main
Telefon 0 93 52 / 18-0
Telefax 0 93 52 / 18-23 58 • Telex 6 89 418-0
eMail product.support@rexroth.de
Internet www.rexroth.com
Ordering details: pressure relief valves / relief/anti-cavitation valves type MHDB...
MH K –
*
Mobile hydraulics = MH
Pressure relief valve:
• pilot operated = DBV
• direct operated = DBD
• pilot operated, with
hydraulic pressure
sequence stage = DBH
Relief/anti-cavitaion valve = DBN
DBN + pressure sequence stage
= DBB
DBN + pressure cut-off stage = DBL
Nominal size 10 = 10
Nominal size 16 = 16
Nominal size 22 = 22
Nominal size 32 = 32
Nominal size 40 = 40
Valve version
Cartridge = K
Adjustment
Set screw with
protective cap = 2
Settable at pressure sequence/cut-off stage
3)
= 9
Series 10 to 19 = 1X
(10 to 19: unchanged installation and connection dimensions)
For types DBN, DBB and DBL
Series 20 to 29 = 2X
(20 to 29: unchanged installation and connection dimensions)
1)
– 017 = cartridge “FA” (M22 x 1.5)
2)
These values are valid for the cartridge. If the cartridge is fitted in a
housing with a lower operating pressure than the max. possible setting
of the cartridge, care must be taken to ensure that the cartridge setting
does not exceed the lower pressure of the housing.
3)
Required only for versions “DBB” and “DBL”.
Further details
in clear text
SO number, (3 digit)
for variations from standard
1)
series
01 =
3)
Threaded connection p
st
Installation cavity
FA = M22 x 1.5
FB = M24 x 1
FH = M24x1.5
FC = M28 x 1
FD = M28 x 1.5
FG = M30 x 1.5
LG = M30x1.5
FK = M33 x 1
FL = M39x1.5
M = NBR seals, suitable for
mineral oil (HL, HLP) to DIN 51 524
V = FKM seals, suitable for
phosphate ester (HFD-R)
No code = Internal pilot oil supply and drain
X = Internal pilot oil supply, unloadable
Internal pilot oil drain
Y = Internal pilot oil supply
External pilot oil drain
XY = Internal pilot oil supply, unloadable
External pilot oil drain
100 = 100 bar max. possible pressure setting
200 = 200 bar max. possible pressure setting
315 = 315 bar max. possible pressure setting
350 = 350 bar max. possible pressure setting
2)
420 = 420 bar max. possible pressure setting
Note:
If valve type differs from those listed on page 2 of the
catalogue sheet, please consult us!
