1/12
Information on available spare parts:
www.boschrexroth.com/spc
Proportional pressure relief valve,
pilot operated,
falling characteristic curve
Type KBVS (High Performance)
RE 18375/04.12
Replaces: 08.11
Table of contents
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 duty cycle 7, 8
Unit dimensions 9
Mounting cavity 10
Available individual components 11
Features
– Cartridge valve
– Mounting cavity R/FD
– Pilot operated proportional valve for the limitation of a sys-
tem pressure
– Suitable for mobile and industrial applications
– Operation by means of proportional solenoid with central
thread and detachable coil
– Rotatable solenoid coil
– Fine balancing of the command value/pressure characteristic
curves possible externally on the control electronics
– Valves are adjusted to maximum pressure by means of an
adjustment screw
– In the event of a power failure, maximum set pressure be-
comes effective
– Control electronics: Data sheet
• Plug-in proportional amplifier
Type VT-SSPA1…
30116
• Analog amplifier Type RA… 95230
• BODAS control unit Type RC… 95200
H7683
Size 2
Component series A
Maximum operating pressure 420 bar
Maximum flow 250 l/min
Inhalt
Table of contents 1
Features 1
Ordering code 2
Preferred types 2
Function, symbol 3
Technical data 4
Characteristic curves 6
Minimum terminal voltage at the coil and relative duty cycle 7
Unit dimensions 9
Mounting cavity R/FD; 3 main ports; thread M28 x 1.5 10
Available individual components 11
Notes 12
2/12 Bosch Rexroth AG Hydraulics
KBVS RE 18375/04.12
Ordering code
Proportional pressure relief
valve, pilot operated
Pressure rating
up to 315 bar = P
up to 420 bar = T
Other pressure stages upon request
Size 2 = 2
Maximum pressure at command value = 0 = B
Component series = A
High-performance and mounting cavity R/FD
= DD
(see page 10)
Proportional solenoid, wet-pin = C
Supply voltage
Control electronics 12 V DC = G12
Control electronics 24 V DC = G24
Further details in the
plain text
No code = Standard
-8 = Coil 800 mA
(see page 5)
Seal material
V = FKM seals
Attention!
Observe compatibility of seals with
hydraulic fluid used!
Y = Pilot oil supply internal,
pilot oil return external
Electrical connection
1)
K4 = without mating connector, with connector
according to DIN EN 175301-803
K40 = without mating connector, with connector
DT 04-2PA (Deutsch plug)
C4 = without mating connector, with connector
AMP Junior-Timer
KBVS 2 B A DD C Y V
*
1)
Mating connectors, separate order, see data sheet 08006.
Preferred types
Type Material number
KBVSP 2 BA/DDCG24K4YV R901138473
KBVST 2 BA/DDCG24K40YV-8 R901233649
2
1 3
1
2
2
1
3
Hydraulics Bosch Rexroth AG
RE 18375/04.12 KBVS
3/12
Function, symbol
Symbol
Version "C4" Version "K40"
General
Type KBVS valves are pilot operated proportional pressure
relief valves of poppet design and are used for limiting the
pressure in hydraulic systems. They basically consist of the
screwed in proportional pilot control valve (1) and the main
valve (2).
These valves can be used for infinitely adjusting the pressure
to be limited in dependence upon the command value. At
command value 0 or in the event of a power failure, the maxi-
mum pressure is set (fail-safe characteristics).
Basic principle
The mechanics of the valve are factory-set to the maximum
pressure. A command value for the proportional reduction of
the system pressure is selected on the control electronics.
The electronics control the solenoid coil with electric current
in dependence upon the command value, which causes the
actual pressure adjustment in main port ① via the pilot con-
trol valve (1) and the main valve (2).
(p
max
= command value 0; p
min
= command value max.)
The pilot oil return is effected externally via main port ③.
Notice!
Any occurring tank pressure (main port ②) is added up to the
set values in main port ①.
Version "K4"
(with mating connector)
① = main port 1 (P)
② = main port 2 (T)
③ = main port 3 (Y)
4/12 Bosch Rexroth AG Hydraulics
KBVS RE 18375/04.12
Technical data (For applications outside these parameters, please consult us!)
general
Weight kg 0.66
Installation position Any - if it is ensured that no air can collect upstream the
valve. Otherwise, a suspended installation is recommended.
Ambient temperature range °C –20 to +120
Storage temperature range °C –20 to +80
Environmental audits:
Vibration test according to DIN EN 60068-2 / IEC 60068-2 /3 axes (X/Y/Z)
DIN EN 60068-2-6: 05/96 Vibrations, sinusoidal 10 cycles, 5 to 2000 to 5 Hz with logarithmic frequency
changing speed of 1 octave/min, 5 to 57 Hz,
amplitude 1.6 mm (p-p), 57 to 2000 Hz, amplitude 10 g
IEC 60068-2-64: 05/93 Vibrations (random) and
broadband noise
20 to 2000 Hz, amplitude 0.1 g
2
/Hz
(14 g RMS / 30 g peak), testing time 24 h
DIN EN 60068-2-27: 03/95 Shock test Half sine 15 g / 11 ms, 3 x in positive, 3 x in negative direc-
tion (a total of 6 individual shocks)
DIN EN 60068-2-29: 03/95 Bump test Half sine 15 g / 11 ms, 1000 x in positive, 1000 x in negative
direction (a total of 2000 individual shocks)
Details per axis:
Climatic test according to DIN EN 60068-2 / IEC 60068-2 (environmental test):
DIN EN 60068-2-1: 03/95 Storage temperature –40 ℃, duration 16 h
DIN EN 60068-2-2: 08/94 +110 ℃, duration 16 h
DIN EN 60068-2-1: 03/95 Cold test 2 cycles, –25 ℃, duration 2 h
DIN EN 60068-2-2: 08/94 Dry heating test 2 cycles, +120 ℃, duration 2 h
IEC 60068-2-30: 1985 Humid heat, cyclic 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 dis-
sipation capacity.
hydraulic
Maximum operating pressure
1)
(main port ①) bar 420
Maximum permissible return flow pressure
(main port ② and ③)
bar 30
Maximum set pressure
2)
See command value/pressure characteristic curves on page 6
Minimum set pressure at max. command value See characteristic curves on page 6
Maximum flow l/min 250
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 hydraulic
fluid - cleanliness class according to ISO 4406 (c)
Class 20/18/15
3)
1)
Attention! The maximum operating pressure is added up
from the set pressure and the return flow pressure!
2)
Attention! The valves are factory-set. In the case of subse-
quent re-adjustment, the warranty will become void!
3)
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 selecting the filters, see www.boschrexroth.com/filter.
Hydraulics Bosch Rexroth AG
RE 18375/04.12 KBVS
5/12
Technical data (For applications outside these parameters, please consult us!)
electric
Supply voltage V 12 DC 24 DC "-8" / 24 DC
Maximum control current mA 1760 1200 800
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
5)
Maximum coil temperature
6)
°C 150
Protection class according
to DIN EN 60529
– Version "K4" IP 65 with mating connector mounted and locked
– Version "K40" IP 69K with mating connector mounted and locked
– Version "C4" IP 66 with mating connector mounted and locked
IP 69K with Rexroth mating connector
(Material no. R901022127)
Control electronics
(separate order) – Plug-in proportional amplifier Type VT-SSPA1…, see data
sheet 30116
– Analog amplifier Type RA…, see data sheet 95230
– BODAS control unit Type RC…, see data sheet 95200
Design according to VDE 0580
hydraulic
Hysteresis
4)
< 4 % of the maximum set pressure
Range of inversion
4)
< 0.5 % of the maximum set pressure
Response sensitivity
4)
< 0.5 % of the maximum set pressure
Manufacturing tolerance of
the command value/pressure
characteristic curve
– Command value 100 % < 2 % of the maximum set pressure
– Command value 0 < 5 % of the maximum set pressure
Step response (T
u
+ T
g
) 0 → 100 % and/or 100 % → 0 ms 100 (depending on the system)
4)
Measured with analog amplifier type RA2-1/10, see data
sheet 95230
5)
In the case of use at heights > 2000 m above MSL, please
consult us.
6)
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!
In the electrical connection, the protective earthing
conductor (PE
) is to be connected properly.
Hydraulic fluid Classification Suitable sealing materials Standards
Mineral oils and related hydrocarbons HL, HLP, HLPD, HVLP, HVLPD FKM DIN 51524
Environmentally
compatible
– Insoluble in water
HEES FKM
ISO 15380
HEPR FKM
– Soluble in water HEPG FKM ISO 15380
Flame-resistant
– Water-free HFDU, HFDR FKM ISO 12922
– Water-containing HFAS FKM ISO 12922
Important information on hydraulic fluids!
– For more information and data on the use of other hydrau-
lic fluids refer to data sheet 90220 or contact us!
– There may be limitations regarding the technical valve
data (temperature, pressure range, service life, mainte-
nance intervals, etc.)!
– The flash point of the process and operating medium used
must be 40 K higher than the maximum solenoid sur-
face temperature.
– Flame-resistant – water-containing: Maximum pressure
differential per control edge 175 bar; otherwise, increased
cavitation erosion!
Tank pre-loading < 1 bar or > 20 % of the pressure differ-
ential. The pressure peaks should not exceed the maxi-
mum operating pressures!
– Environmentally compatible: When using environmen-
tally compatible hydraulic fluids that are simultaneously
zinc-solving, zinc may accumulate in the medium (700 mg
zinc per pole tube).
0
0
20 40 80 10060
50
100
150
200
250
300
350
400
450
0
0
40 80 160 200120
50
100
150
200
250
300
350
400
450
20 60 100 140 180
0
0
50 100 200 250150
10
20
30
40
25 75 125 175 225
6/12 Bosch Rexroth AG Hydraulics
KBVS RE 18375/04.12
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)
Minimum set pressure in main port ① in dependence on flow.
(The characteristic curves were measured without backpressure in main port ②)
Flow in l/min
→
Minimum set pressure in bar →
Hydraulics Bosch Rexroth AG
RE 18375/04.12 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 range of application is broadened.
In single cases, more unfavorable conditions may lead to limi-
tations of the range of application.
8/12 Bosch Rexroth AG Hydraulics
KBVS RE 18375/04.12
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
(0.8 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 range of application is broadened.
In single cases, more unfavorable conditions may lead to limi-
tations of the range of application.
2
1
90
109
50
65
0
LS
17
30
37
15
58
55
4
84
51
2
3
3
6
Hydraulics Bosch Rexroth AG
RE 18375/04.12 KBVS
9/12
Unit dimensions (dimensions in mm)
1 Mating connector for connector "K4" (separate order,
see data sheet 08006)
2 Mating connector for connector "C4" (separate order,
see data sheet 08006)
3 Mating connector for connector "K40" (separate order,
see data sheet 08006)
4 Space required to remove cable socket
5 Hexagon SW30; tightening torque M
A
= 92
+10
Nm
6 Solenoid nut, tightening torque M
A
= 5
+1
Nm
① = main port 1 (P)
② = main port 2 (T)
③ = main port 3 (Y)
LS = Location Shoulder
Rz3max 8
24
26,5
M28 x 1,5
29H8
A
0,05
B
A
0,05
B
36
+0,2
2
+0,1
8
19
28,5
+0,2
35 0,2
42
( 32)
22,5H8
E
A
0,05
B
12
Rzmax 8
45
5
20
1
0,008- / Pt 20
y
=
y
y
20
1
Rzmax 8
B
21H8
E
A
0,05
1
2
3
y
0,5
+0,1
4
19
A
66
1)
56 0,2
10
A
0,03
B
y
C
0,1
A
0,05
B
20
1
Rz1max 8
C
-0,2 +0,2
Rz 32
2)
10/12 Bosch Rexroth AG Hydraulics
KBVS RE 18375/04.12
Mounting cavity R/FD; 3 main ports; thread M28 x 1.5 (dimensions in mm)
1)
Depth of fit
2)
Visual inspection
① = main port 1 (P)
② = main port 2 (T)
③ = main port 3 (Y)
LS = Location Shoulder
Standards:
Workpiece edges DIN ISO 13715
Form and position tolerance DIN EN ISO 1101
General tolerance for
metal-cutting procedures
DIN ISO 2768-mK
Tolerance DIN ISO 8015
Surface condition DIN EN ISO 1302
Hydraulics Bosch Rexroth AG
RE 18375/04.12 KBVS
11/12
998
090
050
Available individual components
020
Item Denomination Direct voltage 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 Pilot control valve seal kit R901138335
1)
Notice!
After the solenoid coil has been replaced, the factory-set
pressure may change by ±5 %.
Suitable housing for threaded connection, see data
sheet 25818.
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 informati-
on 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 18375/04.12
Notes
