Danfoss OSPB, OSPC, OSPD Open Center, OSPB Closed Center User guide
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
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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
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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
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[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/
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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
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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
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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
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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
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[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
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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
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Low noise level
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Low pressure drop
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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
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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-
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line and in LS-line
Optional port connections (according to ISO, SAE or DIN standards)
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Characteristic features for electrohydraulic steering systems with OSPE, EHPS, and EHi:
Possibility of GPS, row sensor, variable steering ratio and joystick steering
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The possibility of manual steering even on very heavy vehicles
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EHPS: High steering pressure requiring smaller cylinders and flow
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EHPS: Low pilot pressure and flow giving extremely low noise in the cabin
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EHPS: Can be combined with Danfoss PVG 32 proportional valve
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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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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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