1/12
Information on available spare parts:
www.boschrexroth.com/spc
Proportional pressure relief
valve, pilot-operated,
rising characteristic curve
Type KBVS.3A (High-Performance)
Component size 3
Component series A
Maximum operating pressure 350 bar
Maximum flow 200 l/min
RE 18139-08/07.12
Replaces: 09.07
Overview of contents Features
– Mounting cavity R/ISO 7789-33-01-0-98
– Pilot-operated valve for limiting a system pressure
– Suitable for mobile and industrial applications
– Operation by proportional solenoid
– Proportional solenoid with central thread and detachable
coil
– Cartridge valve
– Control electronics: plug-in amplifier VT-SSPA1...
– Fine balancing of the command value/pressure characteris-
tic curves possible externally on the control electronics
– In the event of a power failure, the minimum pressure be-
comes effective
H7139
Contents Page
Features 1
Ordering code 2
Preferred types 2
Function, symbol 3
Technical data 4, 5
Characteristic curves 6
Minimum terminal voltage at the coil and relative 7,8
duty cycle
Unit dimensions 9
Mounting cavity 10
Available individual components 11
2/12 Bosch Rexroth AG Hydraulics KBVS RE 18139-08/07.12
Ordering code
Pilot-operated proportional
pressure relief valve
Pressure stage
up to 50 bar = C
up to 100 bar = F
up to 150 bar = H
up to 210 bar = L
up to 250 bar = N
up to 315 bar = P
up to 350 bar = R
Component size 3 = 3
At command value = 0 the
pressure is set = A
Component series = A
Further details in clear
text
no code = Standard
-8 = Coil 800 mA
(see page 5)
Seal material
V = FKM seals
Caution!
Observe compatibility of seals with
the hydraulic fluid used!
Electrical connection
1)
K4 = Component plug 03-pin (2+PE) K4,
DIN EN 175301-803
K40 =
Component plug 02-pin
K40 DT 04-2PA,
make: Deutsch
C4 = Cable plug 02-pin C4/Z30
type: Junior-Timer
Supply voltage
G12 = Control electronics 12 V DC
G24 = Control electronics 24 V DC
C = Proportional solenoid, wet pin
L = High-Performance and
mounting cavity R/ISO 7789
2)
KBVS 3 A A L C V
*
1)
Cable sockets (separate order), see RE 08006
2)
See page 10
Preferred types
Type Material number
KBVSC3AA/LCG24K4V R901061858
KBVSF3AA/LCG24K4V R901061859
KBVSH3AA/LCG24K4V R901061869
KBVSL3AA/LCG24K4V R901061873
KBVSN3AA/LCG24K4V R901061874
KBVSP3AA/LCG24K4V R901061875
KBVSR3AA/LCG24K4V R901061877
2
1
1
2
2
1
Hydraulics Bosch Rexroth AGRE 18139-08/07.12 KBVS 3/12
Function, Symbol
Symbol
Version "C4" Version "K40"
General
Valves of the KBVS type are pilot-operated proportional
pressure relief valves of poppet design and used for limiting
the pressure in hydraulic systems. They basically consist of
a screwed-in proportional pilot valve (1) and the main valve
(2).
These valves can be used for infinitely adusting the pres-
sure to be limited in dependence upon the command value.
At command value 0 or in the event of a power failure, the
minimum pressure is set.
Basic principle
For the proportional increase in the system pressure, a
command value is selected on the control electronics. The
electronics controls the solenoid coil with electric current in
dependence upon the command value, which causes the
actual pressure adjustment in main port 1 via pilot valve (1)
and main valve (2).
(p
max
= command value max; p
min
= command value 0)
Internal pilot oil supply and drain.
Note!
Any tank pressures (main port 2) add to the set value in
main port 1.
Version "K4"
4/12 Bosch Rexroth AG Hydraulics KBVS RE 18139-08/07.12
Technical data (for applications outside these parameters, please consult us!)
general
Weight kg 0,7
Installation orientation Optional, if it can be ensured that no air can collect up-
stream of the valve. Otherwise, we recommend that the
valve be mounted in a suspended position.
Ambient temperature range °C –20 to +120
Storage temperature range °C –20 to +80
Environmental tests:
Vibration test according to DIN EN 60068-2 / IEC 60068-2 /2 axes (X/Z)
DIN EN 60068-2-6: 05/96 Vibration, sinusoidal 10 cycles at 5 to 2000 to 5 Hz with a logarithmic frequency
change rate of 1 Oct./min, 5 to 57 Hz,
amplitude 1.5 mm (p-p), 57 to 2000 Hz, amplitude 10 g
IEC 60068-2-64: 05/93 Vibration (random) and
broadband noise
20 to 2000 Hz, amplitude 0.05 g
2
/Hz
(10 g RMS/30 g peak), testing time 30 min
DIN EN 60068-2-27: 03/95 Shock test Half sine 15 g / 11 ms; 3 x in pos., 3 x in neg. direction
(6 individual shocks in total)
DIN EN 60068-2-29: 03/95 Bump test Half sine 25 g / 6 ms; 1000 x in pos., 1000 x in neg. direction
(2000 individual shocks in total)
Details per axis
Climatic test according to DIN EN 60068-2 / IEC 60068-2 (environmental testing):
DIN EN 60068-2-1: 03/95 Storage temperature –40 °C, dwell time 16 h
DIN EN 60068-2-2: 08/94 +110 °C, dwell time 16 h
DIN EN 60068-2-1: 03/95 Cold test 2 cycles at –25 °C, dwell time 2 h
DIN EN 60068-2-2: 08/94 Dry heat test 2 cycles at +120 °C, dwell time 2 h
IEC 60068-2-30: 1985 Damp heat, cyclical Variant 2/ +25 °C to +55 °C
93 % to 97 % relative humidity, 2 cycles, 24 h each
Salt spray test: 720 h according to DIN 50021
→ Finish painting generally not required. Should you nevertheless wish to apply a finish coat, observe the reduced heat
dissipation capacity.
hydraulic
Max. operating pressure
1)
(main port 1) bar
350
Max. permissible return flow pressure (main port 2) bar
210
Maximum set pressure
2)
See command value/pressure characteristic curves on
page 6
Minimum set pressure at command value 0
See charateristic curves on page 6
Maximum flow l/min 200 (with pressure stage 350 bar max. 100 l/min)
Hydraulic fluid see page 5
Hydraulic fluid temperature range °C –20 to +80
Viscosity range mm
2
/s 15 to 380
Max. permissible degree of contamination of the hy-
draulic fluid - cleanliness class acc. to ISO 4406 (c)
Class 20/18/15
3)
1)
Caution!
The maximum operating pressure is added up
from the set pressure and the return flow pressure
!
2)
Caution!
The
valves are factory-set. In the case of
subsequent re-adjustment, the warranty will become void!
3)
The cleanliness class stated for the components must
be adhered to in hydraulic systems. Effective filtration
prevents malfunction and, at the same time, increases the
service life of components.
For the selection of filters, see www.boschrexroth.com/
filter
Hydraulics Bosch Rexroth AGRE 18139-08/07.12 KBVS 5/12
Technical data (for applications outside these parameters, please consult us!)
electrical
Supply voltage V 12 DC 24 DC “-8” / 24 DC
Maximum control current mA max. nominal
current 1760 mA
max. nominal
current 1200 mA
max. nominal
current 800 mA
Coil resistance – Cold value at 20 °C Ω 2,3 4,8 11,5
– Max. hot value Ω 3,8 7,9 18,9
Duty cycle % 100
4)
Maximum coil temperature
5)
°C 150
Type of protection acc. to
VDE 0470-1
(DIN EN 60529),
DIN 40050-9
– Version "K4" IP 65 with cable socket mounted and locked
– Version "C4" IP 66 with cable socket mounted and locked
IP 69K with Rexroth cable socket (material
no. R901022127)
– Version “K40“ IP 69K with cable socket mounted and locked
Control electronics
6)
Plug-in amplifier VT-SSPA1 (300 Hz)
Rating according to VDE 0580
hydraulic
Hysteresis < 6 % of max. set pressure
Range of inversion < 0,5 % of max. set pressure
Response sensitivity < 0,5 % of max. set pressure
Tolerance of the command
value/pressure characteristic
curve
– Command value 100 % < 5 % of max. set pressure
– Command value 0 < 2 % of max. set pressure
Step response (T
u
+ T
g
) 0 → 100 % or 100 % → 0 ms 100 (depends on system)
4)
In the case of use at heights > 2000 m above MSL we
recommend that you consult the manufacturer.
5)
Due to the surface temperatures occurring on solenoid
coils, the European standards ISO 13732-1 and EN 982
must be observed!
6)
Separate order, see RE 30116
Hydraulic fluid Classification Suitable sealing materials Standards
Mineral oils HL, HLP FKM DIN 51524
Bio-degradable – Insoluble in water HEES FKM VDMA 24568
– Soluble in water HEPG FKM
Important information on hydraulic fluids!
▶ For more information and data on the use of other hydraulic
fluids refer to data sheet 90220 or contact us!
▶ There may be limitations regarding the technical valve data
(temperature, pressure range, service life, maintenance
intervals, etc.)!
▶ The flash point of the hydraulic fluids used must be 40 K
higher than the maximum solenoid surface temperature.
▶ Bio-degradable: When using bio-degradable hydraulic fl uids
that are simultaneously zinc-solving, zinc may accumulate in
the fluid.
400
300
250
200
150
50
0 50 100 150 200
25 75 125 175
100
350
20
315
40
20
10
0 50 100 150 200
25 75 125 175
30
40
20
10
0 50 100 150 20025 75 125 175
30
250
200
150
50
0 25 50 75 100
100
450
350
300
200
150
50
0 25 50 75 100
100
400
250
6/12 Bosch Rexroth AG Hydraulics KBVS RE 18139-08/07.12
Characteristic curves (measured with HLP46,
ϑ
oil
= 40 °C ± 5 °C and 24 V coil)
Command value in % →
Pressure in main port 1 in dependence on command value. Flow = 20 l/min
Pressure in main port 1 in bar →
Flow in l/min →
Pressure in main port 1 in bar →
Pressure in main port 1 in dependence on flow.
(The characteristic curves were measured without backpressure in main port 2.)
Command value in %
→
Pressure in main port 1 in bar →
Minimum set pressure in main port 1 at command value 0.
(The characteristic curves were measured without backpressure in main port 2.)
Flow in l/min
→
Pressure stage 50 to 250 bar
Min. set pressure in bar →
Flow in l/min →
Pressure stage 315 to 350 bar
Min. set pressure in bar →
-40
3
-20 0 40 12020
3,5
4
4,5
5
5,5
6
6,5
7
100
75
80
85
90
95
100
105
110
115
60 80
1,45
1,5
1,55
1,6
1,65
1,7
1,75
1,8
1,85
1
2
3
-40
4
-20
0 40 12020
5
6
7
8
9
10
100
75
80
85
90
95
100
105
60 80
1
1,05
1,1
1,15
1,2
1,25
1,3
1
3
2
Hydraulics Bosch Rexroth AGRE 18139-08/07.12 KBVS 7/12
Minimum terminal voltage at the coil and relative duty cycle
Ambient temperature in °C →
Ambient temperature in °C →
Required minimum voltage
at the coil (1)
→
Required minimum voltage
at the coil (1)
→
Reduced duty cycle DC
for I
max
(1.76 A) in % (2) →
Reduced duty cycle DC
for I
max
(1.2 A) in % (2) →
Admissible continuous application of
current in A with 100 % DC (3) →
Admissible continuous application of
current in A with 100 % DC (3) →
– Version "G12"
– Version "G24"
Admissible working range against the ambient temperature
Limited valve performance
Notice!
The characteristic curves have been determined for coils
with valve with medium test block size (80 x 80 x 80 mm),
without flow in calm air.
Depending on the installation conditions (block size, flow,
air circulation, etc.) there may be a better heat dissipation.
Thus, the area of application is broadened.
In single cases, more unfavorable conditions may lead to
limitations of the area of application.
-40
4
-20
0 40 12020
6
8
10
12
14
16
100
75
80
85
90
95
100
105
60 80
0,65
0,7
0,75
0,8
0,85
0,9
0,95
1
3
2
8/12 Bosch Rexroth AG Hydraulics KBVS RE 18139-08/07.12
Minimum terminal voltage at the coil and relative duty cycle
Ambient temperature in °C →
Required minimum voltage
at the coil (1)
→
Reduced duty cycle DC
for I
max
(1.76 A) in % (2) →
Admissible continuous application of
current in A with 100 % DC (3) →
– Version "G24...-8"
Admissible working range against the ambient temperature
Limited valve performance
Notice!
The characteristic curves have been determined for coils
with valve with medium test block size (80 x 80 x 80 mm),
without flow in calm air.
Depending on the installation conditions (block size, flow,
air circulation, etc.) there may be a better heat dissipation.
Thus, the area of application is broadened.
In single cases, more unfavorable conditions may lead to
limitations of the area of application.
2
1
Ø12,9
Ø30
Ø37
15
90
109,5
6
51
47,5
3
64,4
55
4
0
LS
84
50
2
98
Hydraulics Bosch Rexroth AGRE 18139-08/07.12 KBVS 9/12
Unit dimensions (dimensions in mm)
1 Cable socket for component plug "K4"
(separate order, see RE 08006)
2 Cable socket for component plug "C4"
(separate order, see RE 08006)
3 Cable socket for component plug "K40"
(separate order, see RE 08006)
4 Space required to remove the plug-in connector
5 Hexagon SW41;
– Tightening torque M
A
= 100
+20
Nm (< 250 bar)
– Tightening torque M
A
= 120
+20
Nm (> 250 bar)
6 Solenoid nut, tightening torque M
A
= 5
+1
Nm
① = Main port 1
② = Main port 2
LS = Location shoulder
M33 x 2
Ø35,4
+0,1
min Ø46
+1 1)
A
Ø0,05
A
Ø0,05
1)
“X”
min 19
40,7
+0,4
min 50
2)
1±0,5
A
0,1
Rz1max 8
min 22
max 38,5
min 52
+1 3)
2
1
Rz 16
Ø29
H8
( )
29,033
29,000
A
Rz1max 8
3,1
+0,4
45°
±5°
R0,1
+0,1
max R0,4
A
0,1
Rz1max 8
C
“X”
-0,2 +0,2
Rz 32
10/12 Bosch Rexroth AG Hydraulics KBVS RE 18139-08/07.12
Mounting cavity R/ISO 7789-33-01-0-98; 2 main ports; thread M33 x 2
(dimensions in mm)
1)
Different from ISO 7789-33-01-0-98
2)
Depth of fit
3)
Optional
① = Main port 1
② = Main port 2
LS = Location shoulder
Hydraulics Bosch Rexroth AGRE 18139-08/07.12 KBVS 11/12
998
999
090
050
Available individual components
020
Item Designation DC Material no.
020 Coil for individual connection
1)
Version K4 12 V
24 V
24 V / 800 mA
R901002932
R901002319
R901049962
Version K40 12 V
24 V
24 V / 800 mA
R901003055
R901003053
R901050010
Version C4 12 V
24 V
24 V / 800 mA
R901003044
R901003026
R901049963
050 Nut R900992146
090 Seal ring for pressure tube R900007769
998 Main stage seal kit R961001025
999 Pilot valve seal kit R961000376
1)
Note!
After the solenoid coil was replaced, the factory-set pres-
sure may change by ±5 %.
Bosch Rexroth AG
Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 18-0
documentation@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.
12/12 Bosch Rexroth AG Hydraulics KBVS RE 18139-08/07.12
Notes
