Danfoss OSPB, OSPC, OSPF, OSPDOSPL, OSPLS User guide
...
Technical Information
Load Sensing Steering Units
OSPB/C/F/D/L LS, OLS Priority Valves,
OSQ Flow Amplifiers
www.danfoss.com
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Revision history Table of revisions
Date Changed Rev
April 2021 Changed document number from 'BC00000009' and '11007611' to 'BC152886483962' 1003
October 2019 Data and image revisions throughout 0901
August 2018 Fixed typo, and updated OLS 160 dimension drawing. 0801
June 2017 Overview regarding steering components; Literature reference table: Technical data
chapter; Port thread versions; Dimensions for OSPC/OSPF 230; Specification table for non
catalogue numbers of Danfoss Priority Valves; and Flow and pressure table
July 2016 Updated text under OSPD LS: Steering unit load sensing dynamic with 2 rotary meters and
with integrated valve functions
April 2016 Updated to Engineering Tomorrow design 0503
February 2016 Update image OSPC LS/LSR and OSPF LS for OLS, OSPCX LS for OSQ 0502
September 2014 Various updates EA
February 2014 Converted to Danfoss layout - DITA CMS DA
August 2013 OSPQ deleted CA
November 2009 Steering column deleted BA
May 2006 First version AA
0701
0601
2 | © Danfoss | April 2021 BC152886483962en-001003
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Contents
A wide range of steering components
Conversion factors........................................................................................................................................................................... 6
Survey of literature on Danfoss steering components.......................................................................................................6
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Versions................................................................................................................................................................................................7
OSPB LS: Steering unit with no valve functions...............................................................................................................8
OSPC LS: Steering unit load sensing with integrated valve functions for in line priority valve OLS............ 9
OSPC LS: Steering unit load sensing with integrated valve functions for flange on priority valve
OLSA.........................................................................................................................................................................................9
OSPC LSR: Steering unit load sensing dynamic with integrated valve functions............................................. 10
OSPF LS : Steering unit full drain load sensing dynamic and with integrated valve functions....................10
OSPD LS: Steering unit load sensing dynamic with 2 rotary meters and with integrated valve
functions.............................................................................................................................................................................. 11
OSPL LS:........................................................................................................................................................................................12
OSPBX LS, OSPCX LS and OSPLX LS: Steering units load sensing for flow amplifiers......................................14
Code numbers and weights.......................................................................................................................................................15
OSPB load sensing static non-reaction steering units................................................................................................ 15
OSPB load sensing dynamic non-reaction steering units..........................................................................................15
OSPC load sensing static non-reaction steering unit.................................................................................................. 16
OSPC load sensing dynamic non-reaction steering units..........................................................................................16
OSPC load sensing dynamic reaction steering units................................................................................................... 17
OSPF load sensing dynamic non-reaction steering units..........................................................................................17
OSPD load sensing non-reaction steering units............................................................................................................18
OSPL load sensing static non-reaction steering units.................................................................................................19
OSPL load sensing dynamic non-reaction steering units.......................................................................................... 19
OSPBX and OSPLX load sensing static steering units for OSQ static..................................................................... 20
OSPCX load sensing dynamic steering units for OSQ dynamic...............................................................................20
Specification table for non catalogue numbers of LS Steering Units......................................................................... 21
Technical data................................................................................................................................................................................. 22
Displacement, flow and pressure: OSPB LS, OSPC LS, OSPC LSR.............................................................................22
Displacement, flow and pressure: OSPF LS.....................................................................................................................24
Displacement, flow and pressure: OSPD LS.................................................................................................................... 24
Displacement, flow and pressure: OSPL LS, OSPBX LS, OSPCX LS, OSPLX LS..................................................... 25
Valve functions in OSPC, OSPF, OSPD and OSPL LS steering units..............................................................................26
Pilot pressure relief valve; (P - T, Qp) characteristic......................................................................................................26
Shock valves............................................................................................................................................................................... 26
Suction valves............................................................................................................................................................................ 26
Check valves............................................................................................................................................................................... 27
Port thread versions for OSPB LS, OSPC LS/LSR, OSPF LS, OSPD LS/LSR, OSPL LS, OSPBX LS, OSPCX
LS, OSPLX LS.............................................................................................................................................................................28
Dimensions.......................................................................................................................................................................................31
OSPB LS for OLS, OSPBX LS for OSQ...................................................................................................................................31
OSPC LS/LSR and OSPF LS for OLS, OSPCX LS for OSQ............................................................................................... 33
OSPD LS/LSR for OLS............................................................................................................................................................... 35
OSPL LS for OLS and OSPLX LS for OSQ............................................................................................................................36
OSPL 1200 LS for OLS..............................................................................................................................................................38
Valve Block OVPL
Versions............................................................................................................................................................................................. 39
Code numbers and weight.........................................................................................................................................................40
Technical data................................................................................................................................................................................. 43
Common data............................................................................................................................................................................43
Valve functions................................................................................................................................................................................43
Shock valves............................................................................................................................................................................... 44
Suction valves............................................................................................................................................................................ 44
Check valve.................................................................................................................................................................................44
Backpressure valve...................................................................................................................................................................45
Installation........................................................................................................................................................................................46
Dimensions.......................................................................................................................................................................................46
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Danfoss | April 2021 BC152886483962en-001003 | 3
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Contents
Angle Block OVR
Version............................................................................................................................................................................................... 48
Code numbers and weight.........................................................................................................................................................48
Installation........................................................................................................................................................................................48
Dimensions.......................................................................................................................................................................................49
Priority Valves OLSA, OLS, and OLSP
Versions............................................................................................................................................................................................. 50
OLSA 40/80................................................................................................................................................................................. 51
OLS 40/80 and OLS 120.......................................................................................................................................................... 52
OLS 160.........................................................................................................................................................................................53
OLSP 80........................................................................................................................................................................................ 54
OLS 320.........................................................................................................................................................................................55
OLS 320 without pilot pressure relief valve.................................................................................................................... 56
System sizing...................................................................................................................................................................................57
Code numbers and weights.......................................................................................................................................................57
OLS/OLSA static priority valves for load sensing static steering units.................................................................. 57
OLS/OLSA static priority valves for load sensing statics steering units................................................................ 58
OLS/OLSA dynamic priority valves for load sensing dynamic steering units.....................................................58
OLS/OLSA dynamic priority valves for load sensing dynamic steering units.....................................................59
OLS dynamic priority valves for OSPF LS and OSPU LS dynamic steering units................................................60
Specification table for non catalogue numbers of Danfoss Priority Valves..............................................................62
Technical data................................................................................................................................................................................. 63
Max. pressure on connections............................................................................................................................................. 63
Pressure drop in priority valves........................................................................................................................................... 63
Pressure drop P-EF for static priority valves....................................................................................................................63
Pressure drop P-EF for dynamic priority valves............................................................................................................. 65
Pressure drop P-EF for OLSP static priority valves........................................................................................................ 67
Pressure drop P-EF for OLSP dynamic priority valves..................................................................................................68
Pressure drop P-EF for OLS 320 static priority valves.................................................................................................. 68
Pressure drop P-EF for OLS 320 dynamic priority valves............................................................................................69
OLS 160 and OLS 320, pilot pressure relief valve (P - T, Qp) characteristics........................................................69
Dimensions.......................................................................................................................................................................................71
OLSA..............................................................................................................................................................................................71
OLS 40, OLS 80...........................................................................................................................................................................73
OLS 120.........................................................................................................................................................................................75
OLS 160.........................................................................................................................................................................................76
OLSP 80........................................................................................................................................................................................ 77
OLS 320 in-line...........................................................................................................................................................................78
Flow Amplifiers OSQA and OSQB
Versions............................................................................................................................................................................................. 79
OSQA and OSQB static............................................................................................................................................................79
Code numbers and weights.......................................................................................................................................................80
OSQA and OSQB static flow amplifiers for load sensing static steering units....................................................80
Specification table for non catalogue numbers of Danfoss Flow Amplifier.............................................................81
Technical data................................................................................................................................................................................. 82
Flow and pressure.................................................................................................................................................................... 82
Total displacement of Steering System............................................................................................................................82
Installation...................................................................................................................................................................................82
Valve functions in the flow amplifiers...............................................................................................................................82
Priority valve...............................................................................................................................................................................82
OSQ pilot pressure relief valve (HP - HT, Qp) characteristic...................................................................................... 83
Back pressure valve..................................................................................................................................................................84
Shock valves............................................................................................................................................................................... 85
Suction valves............................................................................................................................................................................ 85
Dimensions.......................................................................................................................................................................................86
OSQA.............................................................................................................................................................................................86
OSQB............................................................................................................................................................................................. 88
4 | © Danfoss | April 2021 BC152886483962en-001003
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
A wide range of steering components
Danfoss is one of the largest producers in the world of steering components for hydrostatic steering
systems on off-road vehicles. Danfoss offers steering solutions both at component and system levels. Our
product range makes it possible to cover applications of all types, ranging from ordinary 2 wheel steering
(also known as Ackermann steering) to articulated steering, automatic steering (for example, by sensor)
and remote controlled steering via satellite. We can offer more than 1,800 different steering units and 250
different priority valves categorized in types, variants and sizes.
Danfoss offers:
For hydrostatic steering systems:
Product type Displacement Rated Flow Steering Pressure
Mini steering units
Steering units
Priority valves
Pilot operated flowamplifiers (factors: 4, 5, 8,
or 10)
Pilot operated steering
valves
32 – 100 cm3/rev
[1.95 – 6.10 in3/rev]
40 – 1200 cm3/rev
[2.44 to 73.2 in3/rev]
–
– 240 and 400 l/min [63.4 and
–
max. 20 l/min
[5.28 US gal/min]
max. 100 l/min
[26.4 US gal/min]
40, 80, 120, 160, 320 l/min
[10.6, 21.1, 31.7, 42.3, 84.5
US gal/min]
105.7 US gal/min]
max. 100 l/min
[26.4 US gal/min]
max. 150 bar
[2180 psi]
max. 240 bar
[3481 psi]
max. 350 bar
[5076 psi]
max. 240 bar
[3480 psi]
max. 250 bar
[3625 psi]
For electrohydraulic steering systems
Product type Displacement Rated flow Steering pressure
Pilot operated steering
valves
Integrated electrical
operated steering valve
Electrical operated
steering valve
- 100 l/min [26.4 US gal/min] 250 bar [3625 psi]
100 - 500 cm3/rev
[6.10 - 30.51 in3]
- 70 l/min [18.5 US gal/min] 210 bar [3045 psi]
50 l/min [13.2 US gal/min] 210 bar [3045 psi]
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Danfoss | April 2021 BC152886483962en-001003 | 5
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
A wide range of steering components
Characteristic features for steering units:
Low steering torque: from 0.5 to 3 N•m in normal steering situations
•
Low noise level
•
Low pressure drop
•
Many types available: Open center Non-reaction, Open center Reaction, Power Beyond, Closed center
•
Non-reaction, Load Sensing, Load Sensing Reaction
One or more built-in valve functions: relief valve, shock valves, suction valves, non-return valve in P-
•
line and LS-line
Optional port connections according to ISO, SAE or DIN standards
•
Characteristics for EH steering systems with OSPE, EHPS, and EHi:
Possibility of GPS, row sensor, variable steering ratio and joystick steering
•
Possibility of manual steering even on very heavy vehicles
•
EHPS:
•
High steering pressure requiring smaller cylinders and flow
‒
Low pilot pressure and flow giving extremely low noise in the cabin
‒
Combined with Danfoss PVG 32 proportional valve
‒
Conversion factors
1 N•m = [8.851 lbf•in] 1 l = [0.264 US gal]
1 N = [0.2248 lbf] 1 bar = [14.5 psi]
1 mm = [0.0394 in] °F = [1.8°C + 32]
1 cm3 = [0.061 in3]
Survey of literature on Danfoss steering components
Detailed data on all Danfoss steering components and accessories can be found in our steering
component catalogs, which is divided in to the following individual sub catalogs:
General information Steering components
Technical data on mini steering units OSPM
Technical data on open center, and closed center
steering units
Technical data on load sensing steering units, priority
valves and flow amplifiers
Technical data on load sensing steering unit with
amplification
Technical data on hydraulic and EH pilot operated
steering valves, electrical actuation modules and
appropriate steering units.
Technical data on combined steering unit/EH steering
valves and steering wheel sensors
Technical data on electrohydraulic steering valves EHi
Technical data on steering wheel sensors SASA
OSPB, OSPC, and OSPD
OSPB, OSPC, OSPF, OSPD, OSPL, OSPBX, OSPLX, OVPL,
OLS and OSQ
OSPU
EHPS, EHPS w. OLS 320, PVE for EHPS and OSPCX
OSPE
For technical information on individual variants, please contact the Danfoss Sales Organization.
6 | © Danfoss | April 2021 BC152886483962en-001003
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Versions
Load sensing
In load sensing steering systems both the steering system and the working hydraulics can be supplied
with oil from the same pump, using a load sensing pump, also delivers the potential for energy saving.
Load sensing steering units have an extra connection for load sensing (LS), so that a load pressure signal
can be directed via the steering unit to a Danfoss priority valve and/or an LS pump. The load sensing
signal controls the oil flow from the priority valve (and/or the LS pump) to the steering unit. The LS
connection is open to tank when the steering unit is in the neutral position.
Load sensing static
Load sensing static steering units require load sensing static priority valves and/or load sensing static
variable displacement pumps. Load sensing static steering systems have no oil flow in the LS connection
when the steering unit is in neutral position.
Load sensing dynamic
Load sensing dynamic steering units require load sensing dynamic priority valves and/or load sensing
dynamic variable displacement pumps. Load sensing dynamic steering systems have a constant oil flow
in the LS connection in the direction of the steering unit even when the steering unit is in neutral
position.
Reaction
With reaction steering units any external forces acting on the steered wheels result in a corresponding
movement of the steering wheel when the driver is not steering the vehicle.
Non-reaction
With non-reaction steering units there is no corresponding movement of the steering wheel when the
driver is not steering the vehicle
©
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150-301.11
L
L
R
R
P
P
T
TLSLS
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
OSPB LS: Steering unit with no valve functions
OSPB LS (OLS)
Load sensing static non-reaction and load sensing dynamic non-reaction
Top: Danfoss diagram; bottom: CETOP diagram
8 | © Danfoss | April 2021 BC152886483962en-001003
150-595.11
L
L
R
R
P
P
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T
LS
LS
150-596.10
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L R
R
P
P
T
TLSLS
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
OSPC LS: Steering unit load sensing with integrated valve functions for in line priority valve OLS
OSPC LS (OLS)
Load sensing dynamic non-reaction
OSPC LS: Steering unit load sensing with integrated valve functions for flange on priority valve OLSA
OSPC LS (OLSA)
Load sensing dynamic non-reaction
©
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150-598.11
L
L
R
R
P
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T
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150-597.11
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R
P
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TLSLS
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
OSPC LSR: Steering unit load sensing dynamic with integrated valve functions
OSPC LSR (OLS)
Load sensing dynamic reaction
OSPF LS : Steering unit full drain load sensing dynamic and with integrated valve functions
OSPF LS (OLS)
Load sensing dynamic non-reaction
10 | © Danfoss | April 2021 BC152886483962en-001003
L R
150-599.11
LS
P T
L R
P
T
LS
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
OSPD LS: Steering unit load sensing dynamic with 2 rotary meters and with integrated valve functions
The OSPD has 2 rotary meters (gear wheel sets). Should the pump supply be lost, only one rotary meter
will be active: OSPD displacement will be low for emergency steering (only one rotary meter active) for
pressure P-T <3 bar. Displacement will be high for pressure P-T >5 bars: both rotary meters are active.
OSPD LS (OLS)
Load sensing dynamic non-reaction
©
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150-301.11
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150-601.10
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R
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T
LS
LS
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
OSPL LS:
Steering unit load sensing for high steering flow, displacement larger than 500 cm3/rev [30.5 in3/rev].
OSPL LS (OLS) - Load sensing static non-reaction
OSPL LS (OLS) - Load sensing dynamic non-reaction
12 | © Danfoss | April 2021 BC152886483962en-001003
150-613.10
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LS
LS
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
OSPL 1200 (OLS) Load sensing dynamic non-reaction
©
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L
R
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L
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R
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150-310.12
P T LS
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
OSPBX LS, OSPCX LS and OSPLX LS: Steering units load sensing for flow amplifiers
OSPBX LS and OSPLX LS are load sensing steering units with the L and the R connections open to tank
when in neutral position. OSPBX LS and OSPLX LS can only be used with Danfoss flow-amplifiers OSQA or
OSQB. OSPBX LS and OSPLX LS steering units must not be connected directly to the steering cylinder.
OSPCX LS is for OSQ dynamic has per standard included check valve in P and check valve in LS
OSPBX LS, OSPLX LS - Load sensing static
14 | © Danfoss | April 2021 BC152886483962en-001003
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Code numbers and weights
OSPB load sensing static non-reaction steering units
OSPB LS Static steering units have no valve functions.
OSPB LS in the table below have all standard neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
Steering unit Code Numbers Weight
Connections
European version for OLS
G 1/2
**)
G 1/4 - S
OSPB 50 LS - 150G6085 5.2 [11.46]
OSPB 80 LS - 150G6086 5.3 [11.68]
OSPB 100 LS - 150G6087 5.4 [11.90]
OSPB 125 LS - 150G6088 5.5 [12.13]
OSPB 160 LS - 150G6089 5.6 [12.35]
OSPB 200 LS 150-0103 150G6090 5.8 [12.79]
OSPB 315 LS 150-0104 150-0116 6.2 [13.67]
OSPB 400 LS 150-0105 150-0117 7.0 [15.43]
*)
O-ring chamfer on port connections
**)
Spot face around port connection
US version for OLS
3/4-16 UNF - O
7/16-20 UNF - O*) + S
kg [lb]
*)
**)
Valve blocks OVP and OVR can be mounted on all of the OSPB steering units from the above table.
OSPB load sensing dynamic non-reaction steering units
OSPB LS Dynamic steering units have no valve functions.
OSPB LS in the table below have all standard neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
Steering unit Code Numbers Weight
Connections
US version for OLS
3/4-16 UNF - O
7/16-20 UNF - O*) + S
OSPB 50 LS 150-8204 5.2 [11.46]
OSPB 80 LS 150-8205 5.3 [11.68]
OSPB 100 LS 150-8206 5.4 [11.90]
OSPB 125 LS 150-8207 5.5 [12.13]
OSPB 160 LS 150-8208 5.6 [12.35]
OSPB 200 LS 150-8209 5.8 [12.79]
OSPB 315 LS 150-8210 6.2 [13.67]
OSPB 400 LS 150-8211 7.0 [15.43]
*)
O-ring chamfer on port connections
**)
Spot face around port connection
*)
**)
kg [lb]
Valve blocks OVP and OVR can be mounted on all of the OSPB steering units from the above table
©
Danfoss | April 2021 BC152886483962en-001003 | 15
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
OSPC load sensing static non-reaction steering unit
OSPC LS Static steering units in the table below incorporate all the following valve functions:
check valve in P-port
•
pilot pressure relief valve
•
shock valves
•
suction valves
•
OSPC LS in the table below have all standard neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
Steering unit Code numbers Valve settings Weight
Connections Relief
European
for OLS
G 1/2
**)
G 1/4 - S
OSPC 80 LS 150-1230 150-1188 150-1222 170
OSPC 100 LS 150-1231 150-1189 150-1221 5.4 [11.90]
OSPC 125 LS 150-1232 150-1190 150-1220 5.5 [12.13]
OSPC 160 LS 150-1233 150-1191 150-1219 5.6 [12.35]
OSPC 200 LS 150-1234 150-1192 150-1218 5.8 [12.79]
OSPC 315 LS 150-1235 - 150G6091 6.2 [13.67]
OSPC 400 LS 150-1240 - - 7.0 [15.43]
*)
O-ring chamfer on port connections
**)
Spot face around port connections
European
and
US version
for OLSA
US version for OLS
3/4-16 UNF - O
7/16-20 UNF - O*) + S
Shock
valve
*)
bar [psi]
**)
[2465]
valve
bar [psi]
225
[3263]
kg [lb]
5.3 [11.68]
If you require other port connections, valve combinations and/or other valve settings or other
displacements, please fill in the order form in the Specification Table for Non Catalogue Numbers of LS
Steering Units and contact the Danfoss Sales Organization.
OSPC load sensing dynamic non-reaction steering units
OSPC LS Dynamic steering units in the table below incorporate all the following valve functions:
check valve in P-port
•
pilot pressure relief valve
•
shock valves
•
suction valves
•
check valve in LS-line for all OSPC LS Dynamic up to and including 200 cm³/rev
•
OSPC LS in the table below have all standard neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
16 | © Danfoss | April 2021 BC152886483962en-001003
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Steering unit Code numbers Valve settings Weight
Connections Relief
European
version for OLS
**)
G 1/2 - S
**)
G 1/4 - S
OSPC 50 LS 150-8233 150-8222 150-8215 140
OSPC 80 LS 150-8234 150-8223 150-8216 170
OSPC 100 LS 150-8235 150-8224 150-8217 5.4 [11.90]
OSPC 125 LS 150-8236 150-8225 150-8218 5.5 [12.13]
OSPC 160 LS 150-8237 150-8226 150-8219 5.6 [12.35]
OSPC 200 LS 150-8238 150-8227 150-8220 5.8 [12.79]
OSPC 315 LS 150-8239 - 150-8221 6.2 [13.67]
OSPC 400 LS 150-8240 - - 7.0 [15.43]
**)
Spot face around port connections
*)
O-ring chamfer on port connections
European and
US version for
OLSA
US version
for OLS
3/4-16 UNF - O
7/16-20 UNF - O*)+S
Shock
valve
bar [psi]
*)
**)
[2030]
[2465]
valve
bar [psi]
200
[2900]
225
[3263]
kg [lb]
5.2 [11.46]
5.3 [11.68]
If you require other port connections, valve combinations and/or other valve settings or other
displacements please fill in the order form in the Specification Table for Non Catalogue Numbers of LS
Steering Units and contact the Danfoss Sales Organization.
OSPC load sensing dynamic reaction steering units
OSPC LSR Dynamic steering units in the table below incorporate all the following valve functions:
check valve in P-port
•
pilot pressure relief valve
•
shock valves
•
suction valves
•
check valve in LS-line
•
OSPC LSR in the table below have all standard neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
Steering unit Code numbers Valve settings Weight
Connections
European version for OLS
**)
G 1/2 - S
**)
G 1/4 - S
OSPC 80 LSR 150-8241 170 [2465] 225 [3263] 5.3 [11.68]
OSPC 200 LSR 150-8242 5.8 [12.79]
**)
Spot face around port connections (can not be used in connection with OVR angular block)
Relief valve
bar [psi]
Shock valve
bar [psi]
kg [lb]
If you require other port connections, valve combinations, valve settings and/or other displacements,
please fill in the order form in the Specification Table for Non Catalogue Numbers of LS Steering Units and
contact the Danfoss Sales Organization.
OSPF load sensing dynamic non-reaction steering units
OSPF LS Dynamic steering units in the table below incorporate all the following valve functions:
©
Danfoss | April 2021 BC152886483962en-001003 | 17
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
check valve in P-port
•
pilot pressure relief valve
•
shock valves
•
suction valves
•
OSPF LS in the table below have all soft neutral setting springs, see Specification Table for Non Catalogue
Numbers of LS Steering Units
Steering unit Code numbers Valve settings Weight
Connections
European version for OLS
**)
G 1/2 - S
**)
G 1/4 - S
OSPF 80 LS 150G5079 170 [2465] 225 [3263] 5.3 [11.68]
OSPF 100 LS 150G5080 5.4 [11.90]
OSPF 125 LS 150G5081 5.5 [12.13]
OSPF 160 LS 150G5082 5.6 [12.35]
OSPF 200 LS 150G5083 5.8 [12.79]
OSPF 315 LS 150G5084 6.2 [13.67]
OSPF 400 LS 150G5085 7.0 [15.43]
**)
Spot face around port connections (can not be used in connection with OVR angular block)
Relief valve
bar [psi]
Shock valve
bar [psi]
kg [lb]
If you require other port connections, valve combinations, valve settings and/or other displacements,
please fill in the order form in the Specification Table for Non Catalogue Numbers of LS Steering Units and
contact the Danfoss Sales Organization.
OSPD load sensing non-reaction steering units
OSPD LS Dynamic steering units in the table below incorporate all the following valve functions:
check valve in P-port
•
pilot pressure relief valve
•
shock valves
•
suction valves
•
check valve in LS-line
•
OSPD LS in the table below have all standard neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
Steering unit Code numbers Valve settings Weight
Connections
European version
**)
G 1/2 - S
**)
G 1/4 - S
OSPD 70/230 LS 11113141 170 [2465] 225 [3263] 7.7 [17.00]
OSPD 70/270 LS 11113142 7.9 [17.41]
OSPD 70/385 LS 11113143 8.4 [18.52]
OSPD 125/325 LS 11113146 8.1 [12.79]
OSPD 125/440 LS 11113147 8.6 [18.96]
**)
Spot face around port connections (can not be used in connection with OVR angular block)
Relief valve
bar [psi]
Shock valve
bar [psi]
kg [lb]
If you require other port connections, valve combinations, valve settings and/or other displacements,
please fill in the order form in the Specification Table for Non Catalogue Numbers of LS Steering Units and
contact the Danfoss Sales Organization.
18 | © Danfoss | April 2021 BC152886483962en-001003
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
OSPL load sensing static non-reaction steering units
OSPL LS Static steering units have no valve functions.
OSPL LS in the three tables below have all strong neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
Steering unit Code numbers Weight
Connections
European version
for OLS
G 1/2
**)
G 1/4 - S
OSPL 520 LS 150-7169 150-7167 150-7168 8.1 [17.86]
OSPL 630 LS 150-7107 150-7164 150-7113 8.4 [18.52]
OSPL 800 LS 150-7108 150-7165 150-7114 8.8 [19.40]
OSPL 1000 LS 150-7110 150-7166 150-7115 10.0 [22.05]
**)
Spot face around port connection
*)
O-ring chamfer on port connections
US version for OLS
3/4-16 UNF - O*)*
7/16-20 UNF - O* +
**)
S
US version for OLS
and OVPL LS - port
7/16-20 UNF - O* +
**)
S
kg [lb]
OSPL load sensing dynamic non-reaction steering units
OSPL LS Dynamic steering units in the table below have no valve functions.
Steering unit Code numbers Weight
Connections
US version for OLS
3/4-16 UNF - O
7/16-20 UNF - O*)* +S
OSPL 520 LS 150-8243 8.1 [17.86]
OSPL 630 LS 150-8212 8.4 [18.52]
OSPL 800 LS 150-8213 8.8 [19.40]
OSPL 1000 LS 150-8214 10.0 [22.05]
*)
O-ring chamfer on port connections
**)
Spot face around port connection
*)
**)
kg [lb]
OSPL LS Dynamic steering units in the table below incorporate all the following valve function:
•
pilot pressure relief valve
Steering unit Code numbers Valve settings Weight
Connections
European version
for OLS and OVPL
LS: G 1/4 - S
OSPL 520 LS 150-8244 170 [2465] 8.1 [17.86]
OSPL 1000 LS 150-8245 10.0 [22.05]
**)
Spot face around port connection
**)
Relief valve
bar [psi]
kg [lb]
If you require other displacements or other valve setting, please fill in the order form in the Specification
Table for Non Catalogue Numbers of LS Steering Units and contact the Danfoss Sales Organization.
OSPL 1200 LS Dynamic steering unit in the table below incorporate all the following valve function:
©
Danfoss | April 2021 BC152886483962en-001003 | 19
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
•
shock valves
•
suction valves
OSPL 1200 LS in the table below has strong neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
Steering unit
OSPL 1200 LS 150-7175 280 [4061] 11 [24.25]
*)
O-ring chamfer on port connections
**)
Spot face around port connection
Code numbers Valve settings Weight
Connections
US version for OLS
3/4 - 16 UNF - O
CF: 11/16 - 12 UN
7/16 - 20 UNF - O*)* + S
*)
Shock valves
bar [psi]
**)
kg [lb]
If you require other displacements or other valve setting, please fill in the order form in the Specification
Table for Non Catalogue Numbers of LS Steering Units and contact the Danfoss Sales Organization.
OSPBX and OSPLX load sensing static steering units for OSQ static
OSPBX LS and OSPLX LS Static steering units in the table below have no valve functions.
OSPBX LS in the table below have all standard neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
OSPLX LS in the table below have all strong neutral setting springs, see Specification Table for Non
Catalogue Numbers of LS Steering Units
Steering unit Code numbers Weight
Connections
European version
G 1/2
**)
G 1/4 - S
OSPBX 160 LS 150-1082 150-1078 5.6 [12.35]
OSPBX 200 LS 150-1083 150-1079 5.8 [12.79]
OSPBX 315 LS 150-1084 150-1080 6.2 [13.67]
OSPBX 400 LS 150-1085 150-1081 7.0 [15.43]
OSPLX 520 LS 150-7170 150-7173 8.1 [17.86]
OSPLX 630 LS 150-7171 150-7174 8.4 [18.52]
OSPLX 800 LS 150-7172 150-7155 8.8 [19.40]
**)
Spot face around port connection
*)
O-ring chamfer on port connections
US version
3/4-16 UNF - O
7/16-20 UNF - O*)* + S
*)
kg [lb]
**)
OSPCX load sensing dynamic steering units for OSQ dynamic
OSPCX LS Dynamic steering unit in the table below incorporates the following valve function:
pilot pressure relief valve
•
See Specification Table for Non Catalogue Numbers of LS Steering Units
If you require other displacements or other valve setting, please fill in the order form in the Specification
Table for Non Catalogue Numbers of LS Steering Units and contact the Danfoss Sales Organization.
20 | © Danfoss | April 2021 BC152886483962en-001003
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Specification table for non catalogue numbers of LS Steering Units
Fill in your company data and place x’s in the table where appropriate, then send to your Danfoss Sales
Organization.
Your
company
Steering unit
type
Reaction type LS ( Non-reaction) LSR (Reaction: only OSPC, OSPD)
Load Sensing
type
DP, cm³/rev
OSPC LS
OSPF LS
DP, cm³/rev
OSPC LSR
DP, cm³/rev
OSPD LS
DP, cm³/rev
OSPD LSR
DP, cm³/rev
OSPL, OSPLX
DP, cm³/rev
OSPBX LS
OSPCX LS
Port threads
OSPC, OSPF
Name Vehicle Potential pcs/year Completed by Date
OSPC OSPF OSPD OSPL OSPBX OSPCX OSPLX
Static (Only OSPC, OSPL, OSPBX, OSPCX, OSPLX) Dynamic
40 50 60 70 80 100 125 160 185 200 230 250 315 400
40 50 60 70 80 100 125 160 185 200
60/185 60/220 60/260 70/195 70/230 70/270 70/385 100/200 100/260 100/300 125/285 125/325 125/440
60/185 60/220 70/195 70/230 100/200
520 630 800 1000 1200 (only OSPL)
160 200 250 315 400
G1/2 G1/2- S** M18 × 1.5 - O* + S** 3/4-16 UNF - O* for OLSA (only OSPC)
Port threads
OSPD
Port threads
OSPL, OSPLX
Relief
valve***
bar
Shock valves
bar
Suction
valves
Check valve
in LS
Neutral
setting
springs
Unit black
painted
©
Danfoss | April 2021 BC152886483962en-001003 | 21
G1/2- S** M18 × 1.5 - O* + S** 3/4-16 UNF - O*
G1/2 3/4-16 UNF - O* For OPVL and without RV (LS = 7/16 - 20
UNF)
70 80 90 100 110 120 140 170 190 200 210 no relief valve
160 180 200 225 240 280 no shock valves
Yes No
Yes (Only for OSPC dynamic and OSPD) No (Only for OSPC, OSPF and OSPL)
Soft:
0.5 - 1.8 Nm in normal steering situations
Yes No
Standard:
0.8 - 3 Nm in normal steering situations
For OVPL and with RV (LS = G 1/4)
Strong:
1.5 - 4 Nm in normal steering situations
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
DP = Displacement, RV = Pilot pressure relief valve.
O*: O-ring chamfer on port connections.
S**: Spot face around port connections (can not be used in connection with OVR angular block).
RV*** see Technical data for limitation in maximum pressure depending on displacements.
Types not mentioned with port connections in the table above, are only available in the version(s) stated
in the code number tables.
An alternative way to specify a variant is to state an existing code number and add the modifications, you
would like to have implemented in the basic steering unit.
Code number of basic steering unit: __________________________________________________
Requested modifications: ___________________________________________________________
Technical data
Common data, refer to General Steering Components Technical Information, BC152886484183.
Displacement, flow and pressure: OSPB LS, OSPC LS, OSPC LSR
OSPB LS, OSPC LS, OSPC LSR
Steering unit Displacement
cm³/rev
[in³/rev]
OSPC 40 LS Static 40 [2.44] 4 [1.06] 140 [2030] 40 [580] 280 [4061]
OSPB/OSPC 50 LS Static 50 [3.05] 5 [1.32]
OSPC 60 LS Static 60 [3.66] 6 [1.58]
OSPC 70 LS Static 70 [4.27] 7 [1.85] 175 [2538]
OSPB/OSPC 80 LS Static 80 [4.88] 8 [2.11]
OSPB/OSPC 100 LS Static 100 [6.10] 10 [2.64]
OSPB/OSPC 125 LS Static 125 [7.63] 13 [3.43] 210 [3045]
OSPB/OSPC 160 LS Static 160 [9.76] 16 [4.23]
OSPC 185 LS Static 185 [11.29] 19 [5.02]
OSPB/OSPC 200 LS Static 200 [12.20] 20 [5.28]
OSPC 230 LS Static 230 [14.03] 23 [6.07]
OSPC 250 LS Static 250 [15.25] 25 [6.60]
OSPB/OSPC 315 LS Static 315 [19.22] 32 [8.45]
OSPB/OSPC 400 LS Static 400 [24.41] 40 [10.57]
*
Rated flow at 100 rpm.
**
Any OSPB/C LS Static can withstand 210 bar in maximum system pressure. However, OSPB/C with small gear wheel
set and high pressure will have relatively high slippage values.
Rated oil
*
flow
l/min
[US gal/min]
Max. pressure, bar (psi)
System
pressure
P-T port
pressure
T,
**
absolute
port
pressure
L-T/R-T
port
pressure
22 | © Danfoss | April 2021 BC152886483962en-001003
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
OSPB LS, OSPC LS, OSPC LSR
Steering unit Displacement
cm³/rev
[in³/rev]
OSPC 40 LS Dynamic 40 [2.44] 4 [1.06] 140 [2030] 40 [580] 280 [4061]
OSPB/OSPC 50 LS Dynamic 50 [3.05] 5 [1.32]
OSPC 60 LS Dynamic 60 [3.66] 6 [1.58]
OSPC 70 LS Dynamic 70 [4.27] 7 [1.85] 175 [2538]
OSPB/OSPC 80 LS Dynamic 80 [4.88] 8 [2.11]
OSPB/OSPC 100 LS Dynamic 100 [6.10] 10 [2.64]
OSPB/OSPC 125 LS Dynamic 125 [7.63] 13 [3.43] 210 [3045]
OSPB/OSPC 160 LS Dynamic 160 [9.76] 16 [4.23]
OSPC 185 LS Dynamic 185 [11.29] 19 [5.02]
OSPB/OSPC 200 LS Dynamic 200 [12.20] 20 [5.28]
OSPC 230 LS Dynamic 230 [14.03] 23 [6.07]
OSPC 250 LS Dynamic 250 [15.25] 25 [6.60]
OSPB/OSPC 315 LS Dynamic 315 [19.22] 32 [8.45]
OSPB/OSPC 400 LS Dynamic 400 [24.41] 40 [10.57]
OSPC 40 LSR Dynamic 40 [2.44] 4 [1.06] 140 [2030] 40 [580] 280 [4061]
OSPC 50 LSR Dynamic 50 [3.05] 5 [1.32]
OSPC 60 LSR Dynamic 60 [3.66] 6 [1.58]
OSPC 70 LSR Dynamic 70 [4.27] 7 [1.85] 175 [2538]
OSPC 80 LSR Dynamic 80 [4.88] 8 [2.11]
SPC 100 LSR Dynamic 100 [6.10] 10 [2.64]
OSPC 125 LSR Dynamic 125 [7.63] 13 [3.43] 210 [3045]
OSPC 160 LSR Dynamic 160 [9.76] 16 [4.23]
OSPC 185 LSR Dynamic 185 [11.29] 19 [5.02]
OSPC 200 LSR Dynamic 200 [12.20] 20 [5.28]
*
Rated flow at 100 rpm.
**
Any OSPB/C LS Dynamic can withstand 210 bar in maximum system pressure. However, OSPB/C with small gear
wheel set and high pressure will have relatively high slippage values.
Rated oil
*
flow
l/min
[US gal/min]
Max. pressure, bar (psi)
System
pressure
P-T port
pressure
T,
**
absolute
port
pressure
L-T/R-T
port
pressure
©
Danfoss | April 2021 BC152886483962en-001003 | 23
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Displacement, flow and pressure: OSPF LS
Steering unit Displacement
OSPF 50 LS Dynamic 50 [3.05] 5 [1.32] 140 [2030] 40 [580] 280 [4061]
OSPF 60 LS Dynamic 60 [3.66] 6 [1.58]
OSPF 70 LS Dynamic 70 [4.27] 7 [1.85] 175 [2538]
OSPF 80 LS Dynamic 80 [4.88] 8 [2.11]
OSPF 100 LS Dynamic 100 [6.10] 10 [2.64]
OSPF 125 LS Dynamic 125 [7.63] 13 [3.43] 210 [3045]
OSPF 160 LS Dynamic 160 [9.76] 16 [4.23]
OSPF 185 LS Dynamic 185 [11.29] 19 [5.02]
OSPF 200 LS Dynamic 200 [12.20] 20 [5.28]
OSPF 230 LS Dynamic 230 [14.03] 23 [6.07]
OSPF 250 LS Dynamic 250 [15.25] 25 [6.60]
OSPF 315 LS Dynamic 315 [19.22] 32 [8.45]
OSPF 400 LS Dynamic 400 [24.41] 40 [10.57]
*
Rated flow at 100 rpm.
**
Any OSPB/C/F LS Dynamic can withstand 210 bar in max. system pressure. However OSPB/C/F w. small gear wheel
cm³/rev [in³/
rev]
Rated oil
*
flow
l/min [US gal/
min]
Max. pressure, bar (psi)
System
pressure
P-T port
pressure
**
T, absolute
port pressure
L-T/R-T port
pressure
set and high pressure will have relatively high slippage values.
Displacement, flow and pressure: OSPD LS
OSPD steering units in the table below are all Load Sensing Dynamic type.
Steering unit Displacement
manual steer
mode
cm³/rev
[in³/rev]
OSPD 60/185 LS 60 [3.66] 185 [11.29] 19 [5.02] 210 [3045] 40 [580] 280 [4061]
OSPD 60/220 LS 60 [3.66] 220 [13.42] 22 [5.81]
OSPD 60/260 LS 60 [3.66] 260 [15.87] 26 [6.87]
OSPD 70/195 LS 70 [4.27] 195 [11.90] 20 [5.28]
OSPD 70/230 LS 70 [4.27] 230 [14.03] 23 [6.07]
OSPD 70/270 LS 70 [4.27] 270 [16.48] 27 [7.13]
OSPD 70/385 LS 70 [4.27] 385 [23.49] 39 [10.30]
OSPD 100/200 LS 100 [6.10] 200 [12.20] 20 [5.28]
OSPD 100/260 LS 100 [6.10] 260 [15.87] 26 [6.87]
OSPD 100/300 LS 100 [6.10] 300 [18.31] 30 [7.93]
OSPD 125/285 LS 125 [7.63] 285 [17.39] 29 [7.66]
OSPD 125/325 LS 125 [7.63] 325 [19.83] 33 [8.72]
OSPD 125/440 LS 125 [7.63] 440 [26.85] 44 [11.62]
Displacement
normal steer
mode
cm³/rev
[in³/rev]
Rated oil
*
flow
l/min
[US gal/min]
Max. pressure, bar (psi)
System
Pressure
P-T port
pressure
T,
absolute
port
pressure
L-T/R-T
port
pressure
24 | © Danfoss | April 2021 BC152886483962en-001003
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Steering unit Displacement
manual steer
mode
cm³/rev
[in³/rev]
Displacement
normal steer
mode
cm³/rev
[in³/rev]
Rated oil
*
flow
l/min
[US gal/min]
Max. pressure, bar (psi)
System
Pressure
P-T port
pressure
T,
absolute
port
pressure
L-T/R-T
port
pressure
OSPD 60/185 LSR 60 [3.66] 185 [11.29] 19 [5.02] 210 [3045] 40 [580] 280 [4061]
OSPD 60/220 LSR 60 [3.66] 220 [13.42] 22 [5.81]
OSPD 70/195 LSR 70 [4.27] 195 [11.90] 20 [5.28]
OSPD 100/200 LSR 100 [6.10] 200 [12.20] 20 [5.28]
*
Rated flow at 100 rpm.
Displacement, flow and pressure: OSPL LS, OSPBX LS, OSPCX LS, OSPLX LS
Steering unit Displacement
cm³/rev
[in³/rev]
OSPL 520 LS Static 520 [31.73] 52 [13.74] 240 [3480] 40 [580] 280 [4061]
OSPL 630 LS Static 630 [38.44] 63 [16.64]
OSPL 800 LS Static 800 [48.82] 80 [21.10]
OSPL 1000 LS Static 1000 [61.02] 100 [26.40]
OSPL 520 LS Dynamic 520 [31.73] 52 [13.74] 240 [3080] 40 [580] 280 [4061]
OSPL 630 LS Dynamic 630 [38.44] 63 [16.64]
OSPL 800 LS Dynamic 800 [48.82] 80 [21.10]
OSPL 1000 LS Dynamic 1000 [61.02] 100 [26.40]
OSPL 1200** Dynamic 1200 [73.22] 100 [26.40]
OSPBX 160 LS Static 160 [9.76] 16 [4.23] 210 [3045] 40 [580] 280 [4061]
OSPBX 200 LS Static 200 [12.20] 20 [5.28]
OSPBX 250 LS Static 250 [15.25] 25 [6.60]
OSPBX 315 LS Static 315 [19.22] 32 [8.45]
OSPBX 400 LS Static 400 [24.41] 40 [10.57]
OSPCX 160 LS Dynamic 160 [9.76] 16 [4.23] 210 [3045] 40 [580] 280 [4061]
OSPCX 200 LS Dynamic 200 [12.20] 20 [5.28]
OSPCX 250 LS Dynamic 250 [15.25] 25 [6.60]
OSPCX 315 LS Dynamic 315 [19.22] 32 [8.45]
OSPCX 400 LS Dynamic 400 [24.41] 40 [10.57]
OSPLX 520 LS Static 520 [31.73] 52 [13.74] 240 [3480] 40 [580] 280 [4061]
OSPLX 630 LS Static 630 [38.44] 63 [16.64]
OSPLX 800 LS Static 800 [48.82] 80 [21.10]
*
Rated flow at 100 rpm.
**
OSPL 1200 max speed at 100l/min [26.4 US gal/min] 83 rpm.
Rated oil
*
flow
l/min
[US gal/min]
Max. pressure, bar (psi)
System
pressure
P-T port
pressure
T,
absolute
port
pressure
L-R
port
pressure
©
Danfoss | April 2021 BC152886483962en-001003 | 25
3000
2500
2000
1500
1000
0
200
180
160
140
120
100
80
60
0
psi bar
152B79.10
0 10 20 30 40 50 60 70 80 l/min
P-T P-T
Q
p
Q
p
0 2 4 6 8 10 12 14 16 18 20 US gal/min
A
B
OSPC/OSPF/OSPD/OSPU/OSPL LS+OLS 80
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Valve functions in OSPC, OSPF, OSPD and OSPL LS steering units
Pilot pressure relief valve; (P - T, Qp) characteristic
The pilot pressure relief valve protects the steering unit against excessive pressure. The pilot pressure
relief valve in the OSPC LS, OSPF LS, OSPD LS and OSPL LS steering unit together with the priority valve
limit the maximum steering pressure P-T. The pilot pressure relief valve is set at an oil flow to the priority
valve of 25 l/min [6.60 US gal/min].
For OSPC, OSPD and OSPL load sensing dynamic steering units, the setting values are valid at a dynamic
flow of 0.6 l/min [0.16 US gal/min].
For OSPF load sensing dynamic steering units, the setting values are valid at a dynamic flow of 1.1 l/min
[0.29 US gal/min].
Setting tolerance:
</= 170 bar [2465 psi]: rated value +5 bar [72.5 psi].
> 170 bar [2465 psi]: rated value +10 bar [145 psi].
A = 170 + 5 bar [2465+ 73 psi]
B = 140 + 5 bar [2030 + 73 psi]
Shock valves
The shock valves protect the steering unit and reduce external forces on the steering cylinder by limiting
the pressure difference from L to T and from R to T.
The shock valves are set at 3 l/min [0.792 US gal/min]
At higher flow pressure peaks may occur.
26 | © Danfoss | April 2021 BC152886483962en-001003
The shock valves are of the direct acting type, so they react very quickly.
Setting tolerance: rated value +20 bar [290 psi].
Suction valves
The suction valves allow oil suction to avoid cavitation in the steering cylinder. To provide correct
suction, a back pressure valve must be fitted in the tank line from the steering unit.
Generally Danfoss recommend a back pressure of 2 bar [29 psi], but on vehicles with strong self
straightening tendencies and on articulated steered vehicles, we recommend 5-10 bar [72.5 - 145 psi]. For
further advice, please contact the Danfoss Sales Organization.
100
80
60
40
20
0
7
6
5
4
3
2
1
0
psi bar
150-374.10
0 1 2 3 4 5 6 7 8 9 10 11 l/min
T-R
T-L
T-R
T-L
Q
p
Q
p
0 0.25 0.50 0.75 1 1.25 1.50 1.75 2 2.25 2.50 2.75 US gal/min
90
75
60
45
30
15
0
6
5
4
3
2
1
0
psi bar
150-375.11
0 10 20 30 40 50 60 70 80 l/min
Q
p
Q
p
0 3 6 9 12 15 18 21 US gal/min
∆ p ∆ p
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
A connection which incorporates a check valve must be established to allow oil flow to by-pass the back
pressure valve (and filter) from the tank to steering unit. See diagram examples in sub catalogue “General
Steering Components” page 37 - 39.
Check valves
The check valve in the P connection of the steering unit protects the driver against steering wheel jerks.
The check valve prevents oil from flowing backwards into the pump line when steering against a high
pressure on the cylinder side. The pressure drop across the check valve is indicated on the following
graph, which assumes the use of port adapters with 11 mm [0.43 in] minimum bore.
©
Danfoss | April 2021 BC152886483962en-001003 | 27
The check valve in the LS line of OSPC LS and OSPD LS dynamic steering units also protects the driver
against steering wheel jerks. The check valve prevents oil from flowing backwards into the LS line to the
priority valve when steering against a high pressure on the cylinder side.
In OSPF LS oil cannot flow backwards into the LS line, look in sub catalogue: “General Steering
Components “ page 26.
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