Technical Information
Steering
OSPB, OSPC, OSPD Open Center and
OSPB Closed Center
powersolutions.danfoss.com
Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Revision history Table of revisions
Date Changed Rev
May 2017 Updated technical data 0701
April 2016 Updated to Engineering Tomorrow design 0602
August 2014 Port thread deleted= FA
July 2014 Changed to Danfoss layout EA
August 2013 DA
November 2009 Steering column deleted CA
May 2008 TAD deleted BA
November 2002 First version AA
2 | © Danfoss | May 2017 520L0502 | BC00000099en-US0701
Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Contents
A wide range of steering components
Conversion factors........................................................................................................................................................................... 5
Survey of literature with technical data on Danfoss steering components................................................................5
Steering Units, OSPB, OSPC, OSPD Open Center
Versions................................................................................................................................................................................................6
OSPB.................................................................................................................................................................................................6
OSPC................................................................................................................................................................................................ 7
OSPD................................................................................................................................................................................................8
Code numbers and weights
OSPB open center non-reaction steering units.....................................................................................................................9
OSPC open center non-reaction steering units.................................................................................................................. 10
OSPC open center reaction steering units............................................................................................................................11
OSPD open center non-reaction steering units..................................................................................................................11
Order specification
Specification table for non catalogue numbers................................................................................................................. 12
Steering units, OSPB Closed center
Version and code numbers - OSPB..........................................................................................................................................14
Closed center............................................................................................................................................................................. 14
Non-reaction.............................................................................................................................................................................. 14
Code numbers and weights
OSPB code numbers and weights............................................................................................................................................15
Steering units open center and closed center
Technical data................................................................................................................................................................................. 16
Displacement, flow and pressure....................................................................................................................................... 16
Valve functions in OSPC and OSPD steering units....................................................................................................... 17
Pressure relief valve............................................................................................................................................................17
Shock valves..........................................................................................................................................................................18
Suction valves.......................................................................................................................................................................18
Check valve............................................................................................................................................................................19
Pressure drop in neutral.........................................................................................................................................................19
Port thread versions.................................................................................................................................................................20
Dimensions.......................................................................................................................................................................................21
OSPB ON and OSPB CN...........................................................................................................................................................21
OSPC ON and OSPC OR...........................................................................................................................................................22
OSPD ON and OSPD OR..........................................................................................................................................................23
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Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
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.
For hydrostatic steering systems, Danfoss offers:
Mini steering units with displacements from 32 to 100 cm3/rev [1.95 to 6.10 in3/rev], flow up to 20
•
l/min [5.28 US gal/min], steering pressure up to 140 bar [2030 psi].
Steering units with displacements from 40 to 1200 cm3/rev [2.44 to 73.2 in3/rev], flow up to 100 l/min
•
[26.4 US gal/min, steering pressure up to 240 bar [3481 psi].
Priority valves for rated flows at 40, 80, 120, 160 and 320 l/min [10.6, 21.1, 31.7, 42.3 and 84.5 US gal/
•
min], pressure up to 350 bar [5076 psi].
Pilot operated flow-amplifiers with amplification factors of 4, 5, 8, 10 or 20 for rated oil flows of 240
•
and 400 l/min [63.4 and 105.7 US gal/min], steering pressure up to 240 bar [3480 psi].
Pilot operated steering valve with steering flow up to 100 l/min [26.4 US gal/min], steering pressure
•
up to 250 bar [3625 psi] and with integrated priority valve for pump flow up to 120 l/min [31.7 US gal/
min].
For electrohydraulic steering systems Danfoss offers:
Pilot operated steering valves (pilot operated by hydrostatic steering unit or by electrical signal) with
•
steering flows up to 100 l/min [26.4 US gal/min], steering pressure up to 250 bar [3625 psi].
Steering units with integrated electrical operated steering valve with steering flow up to 50 l/min
•
[13.2 US gal/min], steering pressure up to 210 bar [3045 psi].
Electrical operated steering valve with steering flow up to 70 l/min [18.5 US gal/min], steering
•
pressure up to 210 bar [3045 psi].
Characteristic features for steering units:
Low steering torque: From 0.5 N•m to 3 N•m in normal steering situations
•
Low noise level
•
Low pressure drop
•
4 | © Danfoss | May 2017 520L0502 | BC00000099en-US0701
Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
A wide range of steering components
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 in LS-line
Optional port connections (according to ISO, SAE or DIN standards)
•
Characteristic features for electrohydraulic steering systems with OSPE, EHPS, and EHi:
Possibility of GPS, row sensor, variable steering ratio and joystick steering
•
The possibility of manual steering even on very heavy vehicles
•
EHPS: High steering pressure requiring smaller cylinders and flow
•
EHPS: Low pilot pressure and flow giving extremely low noise in the cabin
•
EHPS: Can be 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 with technical data on Danfoss steering components
Detailed data on all Danfoss steering components and accessories can be found in our steering
component catalogues, which is divided in to the following individual sub catalogues:
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 electrohydraulic pilot
operated steering valves, electrical actuation modules
and appropriate steering units.
Technical data on combined steering unit/
electrohydraulic steering valves and steering wheel
sensors
Technical data on electrohydraulic steering valves EHi
Technical data on steering wheel sensors SASA
For technical information on individual variants, please contact the Danfoss Sales Organization.
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
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Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Steering Units, OSPB, OSPC, OSPD Open Center
Versions
Open center steering units have open connection between pump and tank in the neutral position. In
open center steering systems, pumps with fixed displacement are used.
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.
With non-reaction steering units there is no corresponding movement of the steering wheel when the
driver is not steering the vehicle.
OSPB
Steering unit with no valve functions
OSPB ON Open center Non-reaction
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150-434.10
Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Steering Units, OSPB, OSPC, OSPD Open Center
OSPC
Steering unit with integrated valve functions
OSPC ON
OSPC ON Open center Non-reaction
OSPC OR Open center Reaction
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Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Steering Units, OSPB, OSPC, OSPD Open Center
OSPD
Steering unit with 2 rotary meters and with integrated valve functions
The OSPD has 2 rotary meters (gear wheel sets). In the case of no
pump supply only one rotary meter is active for emergency steering.
In normal steering situations both rotary meters are active.
OSPD ON Open center Non-reaction
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Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Code numbers and weights
OSPB open center non-reaction steering units
OSPB has no valve functions.
Steering unit Code Numbers, connections Pump flow range Weight
European versionG
1/2
OSPB 50 ON 150N0039 150N0025 5-18 [1.32-4.76] 5.2 [11.46]
OSPB 80 ON 150N0040 150N0026 10-30 [2.64-7.93] 5.3 [11.68]
OSPB 100 ON 150N0041 150N0027 5.4 [11.90]
OSPB 125 ON 150N0042 150N0024 20-50 [5.28-13.21] 5.5 [12.13]
OSPB 160 ON 150N0043 150N0028 5.6 [12.35]
OSPB 200 ON 150N0044 150N0023 5.8 [12.79]
OSPB 250 ON 150N0052 150N0022 6.0 [13.23]
OSPB 315 ON 150N0045 150N0030 20-70 [5.28-18.49] 6.2 [13.67]
OSPB 400 ON 150N0046 150N0031 7.0 [15.43]
OSPB 500 ON 150N0047 150N0032 7.6 [16.76]
1)
O-ring chamfer on port connections. Valve blocks OVP and OVR can be mounted on the all the OSPB steering units
from the above table.
US
version3/4-16UNF
1)
O
l/min [US gal/min] kg [lb]
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Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Code numbers and weights
OSPC open center non-reaction steering units
OSPC ON in the table below have all the following valve functions incorporated:
check valve in P-port
•
relief valve
•
shock valves
•
suction valves
•
Steering unit Code Numbers, connections Pump flow range Valve settings Weight
European
version
G 1/2 S
OSPC 40 ON 150N2148 - 5-18 [1.32-4.76] 140 [2030] 200 [2900] 5.2 [11.46]
OSPC 50 ON 150N2149 150N2136 5.2 [11.46]
OSPC 80 ON 150N2150 150N2137 10-30 [2.64-7.93] 170 [2465] 225 [3263] 5.3 [11.68]
OSPC 100 ON 150N2151 150N2138 5.4 [11.90]
OSPC 125 ON 150N2152 150N2139 20-50 [5.28-13.21] 5.5 [12.13]
OSPC 160 ON 150N2153 150N2140 5.6 [12.35]
OSPC 200 ON 150N2154 150N2141 5.8 [12.79]
OSPC 250 ON 150N2155 150N2168 6.0 [13.23]
OSPC 315 ON 150N2156 150N2142 20-70 [5.28-18.49] 6.2 [13.67]
OSPC 400 ON 150N2157 - 7.0 [15.43]
OSPC 500 ON 150N2158 - 7.6 [16.78]
2)
Spot-face around port connections (can not be used in connection with OVR angular block).
1)
O-ring chamfer on port connections
2)
US version
3/4-16 UNF
1)
O
l/min [US gal/
min]
Relief valve Shock valve
bar [psi] bar [psi] kg [lb]
If you wish other port connection displacements, combination of displacement and pump flow range,
valve combinations and/or other valve settings, please fill in the Order specification on page 12 and
contact the Danfoss Sales Organisation.
10 | © Danfoss | May 2017 520L0502 | BC00000099en-US0701
Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Code numbers and weights
OSPC open center reaction steering units
OSPC OR in the table below have all the following valve functions incorporated:
check valve in P-port
•
relief valve
•
suction valves
•
Steering unit Code numbers Pump flow range Valve settings Weight
Connections Relief valve
European version G
1/2
OSPC 80 OR 150N2159 10-30 [2.64-7.93] 170 [2465] 5.3 [11.68]
OSPC 200 OR 150N2160 20-50 [5.28-13.21] 5.8 [12.79]
If you wish other displacements, port connections, pump flow range, valve combinations and/or other
valve settings, please fill in theOrder specification on page 12 and contact the Danfoss Sales
Organisation.
OSPD open center non-reaction steering units
OSPD ON in the table below has the following valve functions incorporated:
check valve in P-port
•
relief valve
•
shock valves
•
suction valves
•
l/min [US gal/min] bar [psi] kg [lb]
Steering unit Code numbers Pump flow range Valve settings Weight
Connections
European version
G1/2
2)
S
OSPD 70/195 ON 11113183 20-50 [5.28-13.21]170 [2465] 225 [3263] 7.5 [16.53
2)
Spot-face around port connections (can not be used in connection with OVR angular block)
l/min [US gal/
min]
Relief valve Shock valve
bar [psi] bar [psi] kg [lb]
]
If you wish other displacements, reaction type, pump flow range and/or other valve settings, please fill in
the Order specification on page 12 and contact the Danfoss Sales Organisation.
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Danfoss | May 2017 520L0502 | BC00000099en-US0701 | 11
Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Order specification
Specification table for non catalogue numbers
Specification table for Danfoss open center steering units type OSPC and OSPD which are not available in
the code number tables.
Fill in your company data and place x’s in the table where appropriate then send to your Danfoss Sales
Organisation.
Your company Name Vehicle Potential pcs/year Completed by Date
Steering unit
type
Reaction type ON (Open center Non-reaction) OR (Open center Reaction)
DP, cm3/rev
OSPC ON
DP, cm3/rev
OSPC OR
DP, cm3/rev
OSPD ON
DP, cm3/rev
OSPD OR
Pump flow
range l/min
Port threads G1/2 G1/2 - S
Relief valve bar 70 80 90 100 110 120 140 170 190 200 210 no relief valve
Shock valves
bar
Suction valves Yes No
OSPC OSPD
40 50 60 70 80 100 125 160 185 200 230 250 315 400 500
40 50 60 70 80 100 125 160 185 200
60/185 60/220 60/260 70/195 70/230 70/270 100/260 100/300 125/285 125/325 125/440
60/185 60/220 70/195 70/230
5-18 10-30 20-50 20-70
2)
150 180 200 225 240 no shock valves
M18 × 1.5 - O1) S
2)
M22 × 1.5/M18 × 1.5 - S2)3/4-16UNF - O
1)
Neutral setting
4)
springs
Unit black
painted
1)
O-ring chamfer on port connections
2)
Spot-face around port connections (can not be used in connection with OVR angular block)
4)
Soft springs only allowed for pump flow up to 30 l/min
Soft:
0.5 - 1.8 N•m in normal steering situations
Yes No
Standard:
0.8 - 3 N•m in normal steering situations
Strong:
1.5 - 4 N•m in normal steering situations
DP: Displacement
All OSPC and OSPD steering units specified by code numbers in this catalogue have check valve in P-
connection.
All steering units specified by code numbers in this catalogue have standard neutral setting springs.
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:__________________________
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Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Order specification
Requested modifications:__________________________________________
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Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Steering units, OSPB Closed center
Version and code numbers - OSPB
Closed center
Closed center steering units are blocked on their P port in the neutral position. In closed center steering
systems, variable oil flow is required.
Non-reaction
With non-reaction steering units there is no corresponding
movement of the steering wheel when the driver is not steering the
vehicle
OSPB CN Closed center Non-reaction
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Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Code numbers and weights
OSPB code numbers and weights
OSPB has no valve functions.
OSPB closed center non-reaction steering units
Steering unit Code numbers Weight
Connections
US version
3/4-16UNF O
OSPB 50 CN 150-0125 5.2 [11.46]
OSPB 80 CN 150-0126 5.3 [11.68]
OSPB 100 CN 150-0127 5.4 [11.90]
OSPB 125 CN 150-0129 5.5 [12.13]
OSPB 160 CN 150-0128 5.6 [12.35]
OSPB 200 CN 150-0146 5.8 [12.79]
OSPB 315 CN 150G4104 6.2 [13.23]
OSPB 400 CN 150G4105 7.0 [15.43]
1)
O-ring chamfer on port connections
kg [lb]
1)
Valve blocks OVP and OVR can be mounted on the all the OSPB steering units from the above table
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Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Steering units open center and closed center
Technical data
Displacement, flow and pressure
Common data: Look in sub catalogue: "General, Steering Components" page 28.
OSPB/OSPC ON/OR
Steering unit Displacement
OSPC 40 ON 40 [2.44] 4-18 [1.05-4.76] 140 [2030] 40 [580] 280 [4061]
OSPB/OSPC 50 ON 50 [3.05] 5-18 [1.32-4.76]
OSPC 60 ON 60 [3.66] 6-18 [1.59-4.76]
OSPC 70 ON 70 [4.27] 7-18 [1.85-4.76] 175 [2538]
OSPB/OSPC 80 ON 80 [4.88] 8-30[2.11-7.93]
OSPB/OSPC 100 ON 100 [6.10] 10-30 [2.64-7.93]
OSPB/OSPC 125 ON 125 [7.63] 13-50 [3.43-13.21] 210 [3045]
OSPB/OSPC 160 ON 160 [9.76] 16-50 [4.23-13.21]
OSPB/OSPC 185 ON 185 [11.29] 19-50 [5.02-13.21]
OSPB/OSPC 200 ON 200 [12.20] 20-50 [4.23-13.21]
OSPB/OSPC 230 ON 230 [14.04] 23-50 [6.08-13.21]
OSPB/OSPC 250 ON 250 [15.26] 25-50 [6.60-13.21]
OSPB/OSPC 315 ON 315 [19.22] 32-70 [8.45-18.49]
OSPB/OSPC 400 ON 400 [24.41] 40-70 [10.57-18.49]
OSPB/OSPC 500 ON 500 [30.51] 50-70 [13.21-18.49]
OSPC 40 OR 40 [2.44] 4-18 [1.05-4.76] 140 [2030] 40 [580] 280 [4061]
OSPC 50 OR 50 [3.05] 5-18 [1.32-4.76]
OSPC 60 OR 60 [3.66] 6-18 [1.59-4.76]
OSPC 70 OR 70 [4.27] 7-18 [1.85-4.76] 175 [2538]
OSPC 80 OR 80 [4.88] 8-30[2.11-7.93]
OSPC 100 OR 100 [6.10] 10-30 [2.64-7.93]
OSPC 125 OR 125 [7.63] 13-50 [3.43-13.21] 210 [3045]
OSPC 160 OR 160 [9.76] 16-50 [4.23-13.21]
OSPC 185 OR 185 [11.29] 19-50 [5.02-13.21]
OSPC 200 OR 200 [12.20] 20-50 [4.23-13.21]
OSPB 50 CN 50 [3.05] 5 [1.32] 140 [2030] 40 [580] 280 [4061]
OSPB 80 CN 80 [4.88] 8 [2.11] 175 [2538]
OSPB 100 CN 100 [6.10] 10 [2.64]
OSPB 125 CN 125 [7.63] 13 [3.43]
OSPB 160 CN 160 [9.76] 16 [4.23]
OSPB 200 CN 200 [12.20] 20 [5.28]
OSPB 315 CN 315 [19.22] 32 [8.45]
OSPB 400 CN 400 [24.41] 40 [10.57]
*
Criteria for determining the recommended oil flow:
As a minimum the oil flow it takes to ensure sufficient steering speed at idle engine speed
•
Ensures the least possible pressure loss at full speed
•
Any OSPB ON and OSPC ON/OR can withstand 210 bar in max. system pressure. However, OSPB/C w. small gear wheel set and high pressure will have
relatively high slippage values
cm3 /rev [in3/rev]
Recommended
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
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Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Steering units open center and closed center
Common data: Look in sub catalogue: "General, steering components" page 28.
OSPD ON / OR
Steering unit Displacement
OSPD 60/185 ON 60 [3.66] 185 [11.29] 20-50 [5.28-13.21] 210 [3045] 40 [580] 280 [4061]
OSPD 60/220 ON 60 [3.66] 220 [13.43] 22-50 [5.81-13.21]
OSPD 60/260 ON 60 [3.66] 260 [15.87] 26-50 [6.87-13.21]
OSPD 70/195 ON 70 [4.27] 195 [11.90] 20-50 [5.28-13.21]
OSPD 70/230 ON 70 [4.27] 230 [14.04] 23-50 [6.08-13.21]
OSPD 100/260 ON 100 [6.10] 260 [15.87] 26-50 [6.87-13.21]
OSPD 100/300 ON 100 [6.10] 300 [18.31] 30-50 [7.93-13.21]
OSPD 125/285 ON 125 [7.63] 285 [17.39] 30-50 [7.93-13.21]
OSPD 125/325 ON 125 [7.63] 325 [19.83] 33-70 [8.72-18.49]
OSPD 125/440 ON 125 [7.63] 440 [26.85] 44-70 [11.62-18.49]
OSPD 60/185 OR 60 [3.66] 185 [11.29] 20-50 [5.28-13.21]
OSPD 60/220 OR 60 [3.66] 220 [13.43] 22-50 [5.81-13.21]
OSPD 70/195 OR 70 [4.27] 195 [11.90] 20-50 [5.28-13.21]
OSPD 70/230 ON 70 [4.27] 230 [14.04] 23-50 [6.08-13-21]
*
Criteria for determining the recommended oil flow:
As a minimum the oil flow it takes to ensure sufficient steering speed at idle engine speed
•
Ensures the least possible pressure loss at full speed
•
manual steer mode
cm3/rev
[in3/rev]
Displacement normal
steer mode
cm3/rev [in3/rev]
Recommended
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
Please contact the Danfoss Sales Organisation regarding steering units with code numbers not
mentioned in this catalogue. They may have different technical data.
Valve functions in OSPC and OSPD steering units
The data below comes from measurements on a representative sample of steering units from production.
Oil with a viscosity of 21 mm2/s [100 SUS] at 50°C [122°F] was used during measuring.
Pressure relief valve
The pressure relief valve protects pump and steering unit against excessive pressure and limits the
system pressure while steering. The pressure relief valve is set at 25 l/min [6.60 US gal/min] flow.
Setting tolerances:
170 bar [2466 psi]: rated value +5 bar [+73 psi]
> 170 bar [2466 psi]: rated value +10 bar [+145 psi]
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A
B
P301 240
Qp
Qp
l/min
US gal/min
0 2 4 6 8 10 12 14 16 18
0 10 20 30 40 50 60 70
P-T P-T
psi
bar
3400
3200
3000
2800
2600
2400
2200
2000
1800
1600
230
210
190
170
150
130
110
0
0
Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Steering units open center and closed center
A: 170 +5/-0 bar [2465 +73/-0 psi]
B: 140 +5/-0 bar [2030 +73/-0 psi]
Q: 25 l/min [6.60 US gal/min]
Shock valves
The shock valves protect the steering unit and limit maximum external forces on the steering cylinder.
The shock valves in the steering unit limit the maximum pressure drop from L to T and from R to T. The
shock valves are set at 3 l/min [0.792 US gal/min].
The shock valves are of the direct acting type, so they react very quickly.
Settings: rated value +20 bar [290 psi], ex: 200 +20 bar [2900 +290 psi].
Suction valves
The suction valves ensure 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 we recommended a back pressure of 2 bar [29 psi], but on vehicles with strong
selfstraightening tendencies, we recommend 5-10 bar [72-145 psi].
For further advice, please contact the Danfoss Sales Organisation.
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.
18 | © Danfoss | May 2017 520L0502 | BC00000099en-US0701
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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
P301 237
A
B
Q
Q
US gal/min
l/min
0 3 6 9 12 15 18
0 10 20 30 40 50 60 70
P-T P-T
psi
bar
300
250
200
150
100
50
0
20
18
16
14
12
10
8
6
4
2
0
Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Steering units open center and closed center
Check valve
The check valve 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
check valve is built into the steering unit P connection. The pressure drop across the check valve depends
on the use of port adoptors with 11 mm [0.43 in] minimum bore and is indicated on the graph in Pressure
drop in neutral on page 19.
Pressure drop in neutral
The pressure drop is measured on Open Center steering units, and with the steering unit in neutral
position.
The pressure drop is measured from P to T.
The values are valid at an oil temperature of 50°C [122°F] and a viscosity of 21 mm2/s (100 SUS).
©
Danfoss | May 2017 520L0502 | BC00000099en-US0701 | 19
A: OSPB ON and OSPC ON/OR
B: OSPD ON/OR
The pressure drop curves are solely valid for selected spool sets within the recommended flow range.
E.g. OSPC 50 ON with a spool set for 5-18 l/min [1.32-4.76 US gal/min], pressure drop curve A solely
applies within the interval from 0-18 l/min [0-4.76 US gal/min]. A higher flow supply to the steering unit
150-582.10_A
A
Ø21.5 [0.846]
K
min. 15 [0.59]
150-582.10_B
min. 15 [0.59]
B
Ø28.6 [1.126]
Ø28.3 [1.114]
L
0.6 [0.024]
150-582.10_C
min. 15 [0.59]
C
Ø28.6 [1.126]
Ø28.3 [1.114]
M
0.6 [0.024]
150-582.10_D
D
Ø28.6 [1.126]
Ø28.3 [1.114]
N
min. 15 [0.59]
0.6 [0.024]
150-582.10_E
min. 15 [0.59]
E
Ø28.6 [1.126]
Ø28.3 [1.114]
O
0.6 [0.024]
150-582.10_F
min. 15 [0.59]
F
Ø20.8 [0.819]
P
Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Steering units open center and closed center
(e.g. 30 l/min [7.93 US gal/min]) will make the pressure drop exceed the value, which curve A shows at 30
l/min [7.93 US gal/min].
Port thread versions
A: G main ports
K: DIN 3852-2 - G
C: Metric main ports w.spot-face and O-ring
chamfer
M: ISO 6149-1 – M18×1.5
E: Metric main ports w. spot-face
O: DIN 3852-1 - M22×1.5
B: G main ports w.spot-face
L: DIN 3852-2 - G
D: Metric main ports w. spot-face
N: DIN 3852-1 – M18×1.5
F: UNF main ports w. O-ring chamfer
P: ISO 11926-1 ¾-16UNF
O-ring boss port
20 | © Danfoss | May 2017 520L0502 | BC00000099en-US0701
A B
150-139.11
57 [2.24]
85 [3.35]
102 [4.02]
2.8 [0.110]
min. 7.1 [0.280]
7 [0.28]
29 [1.14] 44 [1.73]
Ø44.4 [1.748]
Ø25.4 [1.000]
Ø91 [3.58]
max. 87 [3.42]
47 [1.85]
LTR
P
44 [1.73]
Ø82.3 [3.240]
Ø81.7 [3.217]
45°
L
2
Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Steering units open center and closed center
Dimensions
OSPB ON and OSPB CN
OSPB ON and OSPB CN
OSPB ON and OSPB CN version
A B
European version
US version
G 1/2; 15 mm [0.59 in] deep M10 × 1.5, 16 mm [0.63 in] deep
3/4 - 16 UNF O-ring boss; 15 mm [0.59 in]
deep
OSPB ON and OSPB CN dimensions
Type L
OSPB 50 126
OSPB 80 129
OSPB 100 132
OSPB 125 135
OSPB 160 140
OSPB 200 145
OSPB 250 151
OSPB 315 160
OSPB 400 171
OSPB 500 184
1
mm
[in]
[4.96]
[5.08]
[5.20]
[5.31]
[5.51]
[5.71]
[5.94]
[6.30]
[6.73]
[7.24]
3/8 - 16 UNC, 16 mm [0.63 in] deep
L
2
mm
6.5
10.4
13.0
16.2
20.8
26.0
32.5
40.9
52.0
65.0
[in]
[0.26]
[0.41]
[0.51]
[0.64]
[0.82]
[1.02]
[1.28]
[1.61]
[2.05]
[2.56]
©
Danfoss | May 2017 520L0502 | BC00000099en-US0701 | 21
R
P
T
L
2.8 [0.110]
7 [0.28]
29 [1.14]
44 [1.73]
min. 7.1 [0.280]
∅25.4 [1.000]
∅44.4 [1.748]
A B
L
1
L
2
44 [1.73]
85 [3.35]
102 [4.02]
P301 238
57 [2.24]
84 [3.31]
47 [1.85]
∅91 [3.58]
∅82.3 [3.240]
∅81.7 [3.217]
45˚
Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Steering units open center and closed center
OSPC ON and OSPC OR
OSPC ON and OSPC OR
OSPC ON and OSPC OR versions
A B
European version:
US version:
G 1/2 w. spot-face
or M18 × 1.5 ISO 6149
or M22 × 1.5 (P and T) + M18 × 1.5 (L and
R) DIN 3852; 15 mm [0.59 in] deep
3/4 - 16 UNF O-ring boss; 15 mm [0.59 in]
deep
M10 × 1.5, 16 mm [0.63 in] deep
3/8 - 16 UNC, 16 mm [0.63 in] deep
OSPC ON and OSPC OR dimensions
Type L
OSPC 40 126
OSPC 50 126
OSPC 60 128
OSPC 70 128
OSPC 80 129
OSPC 100 132
OSPC 125 135
OSPC 160 140
OSPC 185 143
OSPC 200 145
1
mm
[in]
[4.96]
[4.96]
[5.04]
[5.04]
[5.08]
[5.20]
[5.31]
[5.51]
[5.63]
[5.71]
OSPC 230 149 [5.87] 29.9
OSPC 250 151
OSPC 315 160
OSPC 400 171
22 | © Danfoss | May 2017 520L0502 | BC00000099en-US0701
OSPC 500 184
[5.94]
[6.30]
[6.73]
[7.24]
L
2
mm
6.5
6.5
9.1
9.1
10.4
13.0
16.2
20.8
24.0
26.0
32.5
40.9
52.0
65.0
[in]
[0.26]
[0.26]
[0.36]
[0.36]
[0.41]
[0.51]
[0.64]
[0.82]
[0.94]
[1.02]
[1.18]
[1.28]
[1.61]
[2.05]
[2.56]
R
P
T
L
L
3
P301 239
102 [4.02]
85 [3.35]
57 [2.24]
45˚
2.8 [0.110]
min 7.1 [0.280]
7 [0.28]
29 [1.14]
44 [1.73]
L
2
L
1
A B
∅44.4 [1.748]
∅82.3 [3.240]
∅81.7 [3.217]
∅25.4 [1.000]
44 [1.73]
∅91 [3.58]
84 [3.31]
47 [1.85]
Technical Information
OSPB, OSPC, OSPD Open Center and OSPB Closed Center
Steering units open center and closed center
OSPD ON and OSPD OR
OSPD ON and OSPD OR
OSPD ON and OSPD OR versions
A: B:
European version
G 1/2; 15 mm [0.59 in] deep w. spot-face; M10 × 1.5, 16 mm [0.63 in] deep
OSPD ON and OSPD OR dimensions
Type L
OSPD 60/185 191 [7.52] 9.1
OSPD 60/220 195 [7.68] 9.1
OSPD 70/195 190
OSPD 70/230 195
OSPD 100/260 199
OSPD 100/300 204
OSPD 125/285 202
OSPD 125/325 207
OSPD 125/440 222
1
mm [in] mm [in] mm [in]
[7.48]
[7.68]
[7.83]
[8.03]
[7.95]
[8.15]
[8.74]
L
2
9.1
9.1
13.0
13.0
16.2
16.2
16.2
[0.36]
[0.36]
[0.36]
[0.36]
[0.51]
[0.51]
[0.64]
[0.64]
[0.64]
L
3
16.2
20.8
16.2
20.8
20.8
26.0
20.8
26.0
40.9
[0.64]
[0.82]
[0.64]
[0.82]
[0.82]
[1.02]
[0.82]
[1.02]
[1.61]
©
Danfoss | May 2017 520L0502 | BC00000099en-US0701 | 23
Danfoss
Power Solutions GmbH & Co. OHG
Krokamp 35
D-24539 Neumünster, Germany
Phone: +49 4321 871 0
Danfoss
Power Solutions ApS
Nordborgvej 81
DK-6430 Nordborg, Denmark
Phone: +45 7488 2222
Danfoss
Power Solutions (US) Company
2800 East 13th Street
Ames, IA 50010, USA
Phone: +1 515 239 6000
Danfoss
Power Solutions Trading
(Shanghai) Co., Ltd.
Building #22, No. 1000 Jin Hai Rd
Jin Qiao, Pudong New District
Shanghai, China 201206
Phone: +86 21 3418 5200
Products we offer:
Comatrol
www.comatrol.com
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www.turollaocg.com
Hydro-Gear
www.hydro-gear.com
Daikin-Sauer-Danfoss
www.daikin-sauer-danfoss.com
Bent Axis Motors
•
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•
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Displays
•
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•
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•
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Danfoss Power Solutions is a global manufacturer and supplier of high-quality hydraulic and
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that excel in the harsh operating conditions of the mobile off-highway market. Building on
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Go to www.powersolutions.danfoss.com for further product information.
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Please contact the Danfoss Power Solution representative nearest you.
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