OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Revision historyTable of revisions
DateChangedRev
April 2021Changed document number from 'BC00000009' and '11007611' to 'BC152886483962'1003
October 2019Data and image revisions throughout0901
August 2018Fixed typo, and updated OLS 160 dimension drawing.0801
June 2017Overview 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 2016Updated text under OSPD LS: Steering unit load sensing dynamic with 2 rotary meters and
with integrated valve functions
April 2016Updated to Engineering Tomorrow design0503
February 2016Update image OSPC LS/LSR and OSPF LS for OLS, OSPCX LS for OSQ0502
September 2014 Various updatesEA
February 2014Converted to Danfoss layout - DITA CMSDA
Survey of literature on Danfoss steering components.......................................................................................................6
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
OSPBX LS, OSPCX LS and OSPLX LS: Steering units load sensing for flow amplifiers......................................14
Code numbers and weights.......................................................................................................................................................15
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
Code numbers and weight.........................................................................................................................................................40
Common data............................................................................................................................................................................43
Code numbers and weight.........................................................................................................................................................48
OLSA 40/80................................................................................................................................................................................. 51
OLS 40/80 and OLS 120.......................................................................................................................................................... 52
OLS 320 without pilot pressure relief valve.................................................................................................................... 56
System sizing...................................................................................................................................................................................57
Code numbers and weights.......................................................................................................................................................57
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
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
Flow and pressure.................................................................................................................................................................... 82
Total displacement of Steering System............................................................................................................................82
Valve functions in the flow amplifiers...............................................................................................................................82
Back pressure valve..................................................................................................................................................................84
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 typeDisplacementRated FlowSteering Pressure
Mini steering units
Steering units
Priority valves
Pilot operated flowamplifiers (factors: 4, 5, 8,
or 10)
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 informationSteering components
Technical data on mini steering unitsOSPM
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 valvesEHi
Technical data on steering wheel sensorsSASA
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
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.
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
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
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 unitCode NumbersWeight
Connections
US version for OLS
3/4-16 UNF - O
7/16-20 UNF - O*) + S
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
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
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:
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
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.
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
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 LS150-7175280 [4061]11 [24.25]
*)
O-ring chamfer on port connections
**)
Spot face around port connection
Code numbersValve settingsWeight
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
G1/23/4-16 UNF - O*For OPVL and without RV (LS = 7/16 - 20
UNF)
708090100110120140170190200210no relief valve
160180200225240280no shock valves
YesNo
Yes (Only for OSPC dynamic and OSPD)No (Only for OSPC, OSPF and OSPL)
Soft:
0.5 - 1.8 Nm in normal steering situations
YesNo
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 unitDisplacement
cm³/rev
[in³/rev]
OSPC 40 LS Static40 [2.44]4 [1.06]140 [2030]40 [580]280 [4061]
OSPB/OSPC 50 LS Static50 [3.05]5 [1.32]
OSPC 60 LS Static60 [3.66]6 [1.58]
OSPC 70 LS Static70 [4.27]7 [1.85]175 [2538]
OSPB/OSPC 80 LS Static80 [4.88]8 [2.11]
OSPB/OSPC 100 LS Static100 [6.10]10 [2.64]
OSPB/OSPC 125 LS Static125 [7.63]13 [3.43]210 [3045]
OSPB/OSPC 160 LS Static160 [9.76]16 [4.23]
OSPC 185 LS Static185 [11.29]19 [5.02]
OSPB/OSPC 200 LS Static200 [12.20]20 [5.28]
OSPC 230 LS Static230 [14.03]23 [6.07]
OSPC 250 LS Static250 [15.25]25 [6.60]
OSPB/OSPC 315 LS Static315 [19.22]32 [8.45]
OSPB/OSPC 400 LS Static400 [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.
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.
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.
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.
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.
K
min.Ø21[0.83]
min.12[0.479]
A
30°
1[0.04]
150-603.10-A
min.12[0.47]
min.Ø28[1.10]
B
30°
L
150-603.10-B
150-603.10-C
min.15[0.59]
Ø21.5[0.846]
M
C
150-603.10-D
0.6[0.024]
Ø28.3[1.114]
Ø28.6[1.126]
N
min.15[0.59]
D
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
Port thread versions for OSPB LS, OSPC LS/LSR, OSPF LS, OSPD LS/LSR, OSPL LS, OSPBX LS, OSPCX LS, OSPLX LS
A: G port w. spot face (LS in OSPB and OSPL with no
valves)
K: DIN 3852-2 - G 1/4
B: G port w. spot face (LS in OSPC/F/D/Q and OSPL with
valves)
L: DIN 3852-2 - G 1/4
C: G ports (P, T, L, R)
M: DIN 3852-2 - G 1/2
D: G ports w. spot face (P, T, L, R)
N: DIN 3852-2 - G 1/2
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
European version:US version:
A: G 1/2; 15 mm [0.59 in] deepA: 3/4 - 16 UNF O-ring boss; 15 mm [0.59 in] deep
B: M10 × 1.5, 16 mm [0.63 in] deepB: 3/8 - 16 UNC, 16 mm [0.63 in] deep
LS: G ¼ with spot face, 11 mm [0.43 in] deepLS: G 7/16 - 20 UNF O-ring boss, 11.5 mm [0.45 in] deep
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
LS Steering Units OSPB, OSPC, OSPF, OSPD, OSPL
A: G 1/2; 15 mm [0.59 in] deepA: 3/4-16 UNF O-ring boss, 15 mm [0.59 in] deep or for
B: M10 x 1.5, 16 mm [0.63 in] deepB: M10 x 1.5, 16 mm [0.63 in] deep
LS: G 1/4 w. spot face, 11.5 mm [0.45 in] deepLS: 7/16-20 UNF O-ring boss, 11.5 mm [0.45 in] deep
European version:
A: for OVPL
B: M10 x 1.5, 16 mm [0.63 in] deep
LS: G 1/4 w. spot face, 11.5 mm [0.45 in] deep
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Valve Block OVPL
OVPL valve blocks can be flanged onto Danfoss steering units type OSPL, which are prepared for OVPL
mounting.
Versions
OVPL valve blocks contain shock valves, suction valves, check valve and back-pressure valve. OVPL valve
blocks are available with 4, 5 or 7 connections. OVPL with 7 connections have 2 L and 2 R connections,
which means that 2 steering cylinders can be connected directly to the valve block.
Common data, refer to General Steering Components Technical Information, BC152886484183.
The data below come from measurements on a representative sample of valve blocks from production.
An oil with a viscosity of 21 mm²/s [SUS] at 50°C [122°F] was used during measuring.
200
150
100
50
0
15
10
5
0
psibar
152-150.10
0 10 20 30 40 50 60 l/min
∆ p∆ p
Q
p
Q
p
0 2 4 6 8 10 12 14 16 US gal/min
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
The shock valves protect the valve block and steering unit and limit maximum external forces on the
steering cylinder. The shock valves in the valve block limit the maximum pressure drop from L to T and
from R to T.
The shock valves are set at 10 l/min. [2.64 US gal/min].
The shock valves are of the direct acting type, so they react very quickly.
Setting tolerance: rated value +/- 10 bar [145 psi] , ex. 240 [3480 psi] +/- 10 bar [145 psi].
Suction valves
The suction valves ensure oil suction to avoid cavitations in the steering cylinder. To provide correct
suction, a back pressure valve must be fitted in the tank line from the steering unit.
The capacity of the suction valves can be increased by building in a back pressure in the valve block.
The curve below shows pressure drop across a suction 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 P connection of the valve block.
The curve below shows pressure drop across the check valve in p-connection
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Valve Block OVPL
Installation
Connection P in the valve block must be placed over the connection P in the steering unit, so OVPL is
provided with a positioning pin to fit the positioning hole in the steering unit.
The valve block is supplied inclusive of 2 mounting screws and 4 O-rings for building onto the steering
unit.
Tightening torque 65 ±5 N•m [575 ±44 lbf•in]. It is only allowed to mount OVPL blocks on steering units
with a flat port flange, no spot face is allowed.
Dimensions
OVPL, 5 ports
European version:
P, T, L and R:
G 1/2 w. spot face,
15 mm [0.59 in] deep
PP: G 1/4, w. spot face,
11,5 mm [0.45 in] deep
X: 30,2 +0,2
Y: 21,3 +/- 0,2
OVPL, 4 ports (no PP)
US version:
P, T, L and R:
3/4-16 UNF O-ring boss
15 mm [0.59 in] deep
X: 30.2 +0.2
B: Positioning pin premounted in OVPL
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Angle Block OVR
OVR angle blocks are especially designed for applications in which pipes and/or hoses must run parallel
with the steering column axis, and where space is limited.
The valve block can be flanged onto Danfoss steering unit OSPB, OSPC, OSPD, OSPF, OSPQ and OSPL,
which have no spot face around the ports.
Use the angle block makes angle and swivel connections and pipe bends unnecessary.
The OVR connections are positioned away from the steering wheel. (see Dimensions on page 49)
Version
OVR
Code numbers and weight
Installation
OVR in the table below has no valve functions incorporated.
Angle blockCode numbersWeight
Connections
European version
P, T, L, R: G 1/2
S**
OVR152-02012.0 [4.41]
kg [lb]
S** : Spot face around port connections
The valve block is supplied inclusive of 2 mounting screws and 4 O-rings for building onto the steering
unit.
Tightening torque 65 ±5 N•m [575 ±44.3 lbf•in]. OVR blocks may only be mounted on steering units with
a flat port flange, (no spot facing).
For OVR blocks with other thread ore kind of valves mounted, please contact the Danfoss Sales
organization.
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
Versions
Danfoss priority valves are used in steering systems with load sensing steering units. In such systems
steering always has first priority
Load sensing static priority valves
Load sensing static steering units require load sensing static priority valves. Load sensing static steering
systems have no oil flow in the LS connection when the steering unit is in neutral position.
Load sensing dynamic priority valves
Load sensing dynamic steering units require load sensing dynamic priority valves. Load sensing dynamic
steering systems have a constant oil flow in the LS connection from the priority valve to the steering unit
even when the steering unit is in neutral position.
Ports:
P = pump,
CF = controlled flow (priority oil flow),
EF = excess flow,
L = left,
R = right,
T = tank,
LS = load sensing,
PP = pilot pressure
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
OLS 40/80 and OLS 120
The OLS 40, OLS 80, and OLS 120 “in line” priority valves are used in load sensing steering systems
together with OSPB LS, OSPC LS, OSPF LS, OSPD LS, OSPU LS and OSPL LS steering units.
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
OLS 160
The OLS 160 “in line” priority valve is used in load sensing steering systems together with OSPB LS, OSPC
LS, OSPF LS, OSPD LS, OSPU LS and OSPL LS steering units.
OLS 160
OLS static
OLS dynamic
OLS 160 is also available without pilot pressure relief valve.
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
OLSP 80
The priority valve OLSP 80 is to be used in connection with e.g. Danfoss gear pumps type SNP and
steering units type OSPB LS, OSPC LS, OSPF LS, OSPD LS and OSPU LS in load sensing steering systems,
where maximum oil flow does not exceed 80 l/min [21.7 US gal/min].
OLSP 80 priority valves are to be flanged on gear pumps with outlet ports square flange type 35 (35 mm
pitch diameter of 4x M6 bolt holes for fixing the priority valve on pump).
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
OLS 320
The OLS 320 “in line” priority valve is used together with OSPB LS, OSPC LS, OSPF LS, OSPD LS, OSPU LS
and OSPL LS in load sensing steering systems with pump flow up to 320 l/min [84.5 USgal/min].
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
OLS 320 without pilot pressure relief valve
OLS 320 is also available without pilot pressure relief valve.
EHPS steering valve has build in priority valve, but for max. pump flow 120 l/min [31.7 USgal/min] In
systems with EHPS and pump flow between 120 l/min [31.7 USgal/min] and 320 l/min [84.5 USgal/min] a
combination of EHPS and OLS 320 gives a good compact solution to reduce hosing and installation cost
compared with stand alone components. For further details of this OLS 320: look in EHPS Steering Valvewith PVE Electrical Actuation Module and OSPCX CN Steering Wheel Technical Information,
BC152886484652.
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
System sizing
The steering system pump is sized so that satisfactory performance is achieved for both steering and
working hydraulics - even at idle.
Before selecting a priority valve, consider
the type of steering unit (LS static, LS dynamic or OSPF LS dynamic)
•
the displacement of the steering unit
•
the pump flow
•
the application’s requirement for energy optimization, initial steering response time and stability, as
•
these all govern the selection for control spring pressure
whether the priority valve should have internal PP (Pilot Pressure) or external PP-connection depends
•
on the pressure drop in the pump line between the priority valve’s CF-port (Controlled Flow) and the
steering unit’s P-port. With normal hose and tube dimensions and less than 5 m distance between
priority valve and steering unit, the immediate choice is normally a priority valve with internal PP.
The following survey lists the code numbers of the priority valves that are the most frequently used in
connection with the above Danfoss steering unit types. All priority valves in the code number tables,
except OLS 160 static, have internal PP connection. OLS 160 static in the code number table all have
external PP connection.
Code numbers and weights
OLS/OLSA static priority valves for load sensing static steering units
OLSA 40 static and OLSA 80 static
Priority valveCode NumbersControl spring
Connections
European version
T,R,L: G 3/8
P, EF: G 1/2
OLSA 40152B0001-4 [58]2.1 [4.63]
OLSA 40152B0002152B01227 [101.5]2.1 [4.63]
OLSA 40152B0003152B012410 [145]2.1 [4.63]
OLSA 80152B0016152B00194 [58]2.1 [4.63]
OLSA 80152B0017152B00207 [101.5]2.1 [4.63]
OLSA80152B0015152B012510 [145]2.1 [4.63]
US version
T, R, L: 9/16 - 18 UNF
P, EF: 7/8 - 14 UNF
US version
LS, PP, T: 7/16 -20 UNF
CF: 3/4 - 16 UNF
P, EF: 1 1/16 - 12 UNF
spring
pressure
bar [psi]
Pilot
pressure
relief
valve
bar [psi]
Weight
kg [lb]
OLS/OLSA dynamic priority valves for load sensing dynamic steering units
OLSA 40 dynamic and OLSA 80 dynamic for OSPC LS dynamic
Priority valveCode numbersControl spring
Connections
European version
T,R,L: G 3/8
P/EF: G 1/2
OLSA 40152B8001-4 [58]2.1 [4.63]
OLSA 40152B8041152B80427 [101.5]2.1 [4.63]
OLSA 40152B8046152B804310 [145]2.1 [4.63]
OLSA 80152B8047-4 [58]2.1 [4.63]
OLSA 80152B8048152B80447 [101.5]2.1 [4.63]
OLSA 80152B8049152B804510 [145]2.1 [4.63]
US version
T,R,L: 9/16 - 18 UNF
P/EF: 7/8 - 14 UNF
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
OLS 320 dynamic in-line/stand alone with pilot pressure relief valve, black painted
Priority valve Code numbersControl
Connections
European version
LS, T: G¼
CF: G ½
P, EF: G 1
OLS 320110065937 [101.5]170 [2465]5.9 [13.0]
OLS 320 dynamic in-line/stand alone without pilot pressure relief valve, black painted
Priority valveCode numbersControl spring
Connections
US version
LS: 7/16 - 20 UNF
CF: 11/16 - 12 UN
P, EF: 15/16 - 12 UN
OLS 3201100747510 [145]5.9 [13.0]
spring
pressure
bar [psi]
Pilot
pressure
relief valve
bar [psi]
pressure
bar [psi]
Weight
kg [lb]
Weight
kg [lb]
OLS 320 for EHPS: look in EHPS Steering Valve with PVE Electrical Actuation Module and OSPCX CN Steering
Wheel Technical Information, BC152886484652
If you require other port connections, other control spring pressure and/or other PP connection, go to the
survey under System sizing on page 57, and tick off the desired specifications, then consult the Danfoss
Sales Organization.
Ports: PP-port only exists when external PP connection is used. T-port only exists for OLS 160 and OLS 320
with integrated pilot pressure relief valve (RV)
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
S**: Spot face around port connections
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:
This data comes from measurements on a representative sample of priority valves from production. Oil
with viscosity of 21 mm²/s at 50 °C [102 SUS at 122 °F] was used during measuring. Measurement made
when pressure on the LS connection is zero (steering unit in neutral position). The minimum curves apply
when the pressure on the EF connection is higher than the actual control spring pressure. The curves for
control spring pressure of 4 , 7, 10 or 12 bar [58, 101, 145 or 174 psi] apply when pressure on the EF
connection is zero.
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
OLSA/OLS 80
A: OLS/OLSA 80 Dynamic for OSPB, OSPC, OSPF, OSPD, OSPQ, OSPL LS Dynamic
B: OLS/OLSA 80 Dynamic with low pressure drop (P-EF) spool for OSPB, OSPC, OSPD, OSPQ, OSPL LS
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
Pressure drop P-EF for OLS 320 dynamic priority valves
OLS 320
OLS 160 and OLS 320, pilot pressure relief valve (P - T, Qp) characteristics
OLS 160 and OLS 320 with pilot pressure relief valves are used in connection with Danfoss steering units
without pilot pressure relief valve, normally steering unit type OSPL. The pilot pressure relief valve
protects the steering unit against excessive pressure. The pilot pressure relief valve in OLS 160/320
operates with the priority valve spool in the OLS 160/320 to limit the maximum steering pressure P-T
measured across the steering unit ports.
OLS 160:The pilot pressure relief valve is set when an oil flow of 80 l/min [21 US gal/min] is supplied to
OLS 160.
OLS 320:The pilot pressure relief valve is set when an oil flow of 40 l/min [11 US gal/min] is supplied to
OLS 320.
OLS 160 and OLS 320: Setting tolerance: rated value +10 bar [145 psi]
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
European version:US version:
P, EF:
G 1/2 w. spot face
14 mm [0.55 in] deep
x = 34 mm [1.34 in],
max. 1,5 mm [0.06 in] deep or M18 x 1.5 ISO 6149
14.5 mm [0.57 in] deep
x = 29 mm [1.14 in],
max. 1.5 mm [0.06 in] deep or M22 x 1.5 ISO 6149,
15.5 mm [0.61 in] deep
x = 34 mm [1.34 in],
max. 1.5 mm [0.06 in] deep
T, L, R:
G 3/8 w. spot face
12 mm [0.47 in] deep
y = 34 mm [1.34 in],
max. 1.5 mm [0.06 in] deep or M18 x 1.5 ISO 6149,
15 mm [0.59 in] deep
y = 29 mm [1.14 in],
max. 1.5 mm [0.06 in] deep
P, EF:
7/8-14 UNF O-ring boss
16.7 mm [0.66 in] deep
x = 34 mm [1.34 in],
max. 1.5 mm [0.06 in] deep
T, L, R:
9/16 - 18 UNF O-ring boss
12.7 mm [0.50 in] deep
y = 25 mm [0.98 in],
max. 1.5 mm [0.06 in] deep
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
OLS 40, OLS 80
European version:US version:
P, EF:
G 1/2 w. spot face
15 mm [0.59 in] deep
x = 29 mm [1.14 in],
max. 1.5 mm [0.06 in] deep
or M22 x 1.5 ISO 6149
15 mm [0.59 in] deep,
x = 34 mm [1.34 in],
P, EF:
7/8 - 14 UNF O-ring boss
15 mm [0.59 in] deep
x = 34 mm [1.14 in],
max. 1.3 [0.05] deep
max. 1 mm [0.04 in] deep
CF:
G 1/2 w. spot face
14 mm [0.55 in]deep
y = 29 mm [1.14 in],
max. 1.5 mm [0.06 in] deep or M18 x 1,5 ISO 6149
12 mm [0.47 in] deep,
y = 29 mm [1.14 in],
CF:
3/4-16 UNF O-ring boss
14.3 mm [0.56 in] deep
y = 30 mm [1.18 in],
max. 1.3 mm [0.05 in] deep
P, EF:
G 3/4 w. spot face
x = 42 mm [1.65 in],
max. 2.5 mm [0.10 in] deep or M27 x 2 ISO 6149
x = 40 mm [1.57 in],
max. 2.5 mm [0.10 in] deep
CF:
G 1/2 w. spot face
y = 34 mm [1.34 in],
max. 2.5 mm [0.10 in] deep or M18 x 1.5 ISO 6149
y = 29 mm [1.14 in],
max. 2.5 mm [0.10 in] deep
LS, PP:
G 1/4 w. spot face
12 mm [0.47 in] deep
z = 19 mm [0.75 in]
0 mm deep
or M12 x 1,5 ISO 6149
11,5 mm [0.45 in] deep,
z = 19 mm [0.75 in]
0 mm deep
P, EF:
1 1/16 - 12 UN O-ring boss
x = 41mm [1.61 in],
max. 1.5 mm [0.06 in] deep
CF:
3/4 - 16 UNF O-ring boss
y = 30 mm [1.18 in],
max. 1.5 mm [0.06 in] deep
LS, PP:
7/16 - 20 UNF O-ring boss
11.5 mm [0.45 in] deep
z = 19 mm [0.75 in] 0 mm deep
178 [7.01]
75 [2.95]
33 [1.26]
25 [0.98]
32 [1.26]
ø8.9 ± 0.2 [ø0.35 ± 0.01]
35 [1.38]63 [2.48]
130 [5.12]
ø8.9 ± 0.2 [ø0.35 ± 0.01]
32 [1.26]
61.3 [2.41]
124 [4.88]
33 [1.30]
66 [2.60]
Z
U
X
X
Y
Technical Information
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Priority Valves OLSA, OLS, and OLSP
OLS 160
European version:US version:
P, EF:
G 3/4 w. spot face
x = 42 mm [1.65 in],
max. 2.5 mm [0.10 in] deep or G 1 w. spot face
x = 47 mm [1.85 in],
max 2.5 mm [0.10 in] deep
CF:
G 1/2 w. spot face
y = 34 mm [1.34 in],
max. 2.5 mm [0.10 in] deep or G 3/4 w. spot face
y = 38 mm [1.50 in],
max. 2.5 mm [0.10 in] deep
LS, PP, T:
G 1/4 w. spot face
12 mm [0.47 in] deep
z = 22.8 mm [0.89 in],
max. 1 mm [0.04 in]deep
u = 25 mm [0.98 in]
max. 1.5 mm [0.06 in] deep
P, EF:
1 1/16-12 UNF O-ring boss
x = 41 mm [1.61 in],
max. 2.5 mm [0.10 in] deep or 1 5/16 - 12 UNF O-ring boss
x = 49 mm [1.93 in],
max. 2.5 mm [0.10 in] deep
CF:
3/4-16 UNF O-ring boss
y = 32 mm [1.26 in],
max. 2.5 mm [0.10 in] deep
7/8 - 14 UNF O-ring boss
y = 30 mm [1.18 in],
max. 2.5 mm [0.10 in] deep
LS, PP, T:
7/16 - 20 UNF O-ring boss
11.5 mm [0.45 in] deep
z = 22,8 mm [0.89 in],
max. 1.5 mm [0.06 in] deep
u = 21 mm [0.83 in],
max. 1.6 mm [0.06 in] deep
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Flow Amplifiers OSQA and OSQB
Versions
OSQA and OSQB static
Flow amplifier OSQ is used in steering systems of large vehicles and vessels that need high oil flow for
their steering. A steering system of this nature consists of a steering unit and a flow amplifier.
If you require other amplification factors, other valve settings or other control spring pressures, please fill
in the order form under Specification table for non catalogue numbers of Danfoss Priority Valves on page 62
and contact the Danfoss Sales Organization.
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 flow amplifier.
Code number of basic flow amplifier: __________________________
Requested modifications:
Tightening torque for fittings: Look in sub catalogue “General Steering Components” page 36.
Valve functions in the flow amplifiers
The data below come from measurements on a representative sample of flow amplifiers from production.
Oil with viscosity of 21 mm²/s [102 SUS] at 50 °C [122 °C] was used during measuring.
Priority valve
The priority valve is used in load sensing systems where the same pump supplies oil to both the steering
system and working hydraulics. The steering system always has first priority. Measurements were made
when the pressure on the LS connection is zero (steering unit is in neutral position). The minimum curves
apply when the pressure on the EF connection is higher than the actual control spring pressure. The
curves for control spring pressure of 7 bar [101.5 psi] apply when the pressure on the EF connection is
zero
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Flow Amplifiers OSQA and OSQB
OSQA
OSQB
OSQ pilot pressure relief valve (HP - HT, Qp) characteristic
The pilot pressure relief valve protects the steering valve against excessive pressure. The pilot pressure
relief valve together with the priority valve limit the maximum steering pressure HP-HT.
The pilot pressure relief valve in OSQ is set with an oil flow of 140 l/min [37 US gal/min] supplied to the
HP connection.
For OSQA the setting values are valid for pump flow 140 l/min [37 US gal/min].
For OSQB the setting values are valid for pump flow 240 l/min [63 US gal/min]: the setting is done at 140
l/min [37 US gal/min], but compensated to match 240 l/min [63 US gal/min].
Setting tolerance: rated value +10 bar [+145 psi]. The curves below are valid for rated settings 170 bar
OSPB/C/F/D/L LS Steering Units, OLS Priority Valves, OSQ Flow Amplifiers
Flow Amplifiers OSQA and OSQB
Shock valves
The shock valves protect the flow amplifier against shock from external forces on the steering cylinders.
The shock valves in OSQA and OSQB limit the maximum pressure drop from CL to HT and from CR to HT.
The shock valves are set at 10 l/min [2.64 US gal/min].
Setting tolerance: rated value +20 bar [290 psi].
Suction valves
The suction valves ensure oil suction on the side of the steering cylinder pistons where in unfavorable
conditions cavitation might occur. The capacity of the suction valves is increased in OSQB by the built-in
back pressure valve.
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 2080 6201
Products we offer:
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www.hydro-gear.com
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www.daikin-sauer-danfoss.com
Cartridge valves
•
DCV directional control
•
valves
Electric converters
•
Electric machines
•
Electric motors
•
Gear motors
•
Gear pumps
•
Hydraulic integrated
•
circuits (HICs)
Hydrostatic motors
•
Hydrostatic pumps
•
Orbital motors
•
PLUS+1® controllers
•
PLUS+1® displays
•
PLUS+1® joysticks and
•
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PLUS+1® operator
•
interfaces
PLUS+1® sensors
•
PLUS+1® software
•
PLUS+1® software services,
•
support and training
Position controls and
•
sensors
PVG proportional valves
•
Steering components and
•
systems
Telematics
•
Danfoss Power Solutions is a global manufacturer and supplier of high-quality hydraulic and
electric components. We specialize in providing state-of-the-art technology and solutions
that excel in the harsh operating conditions of the mobile off-highway market as well as the
marine sector. Building on our extensive applications expertise, we work closely with you to
ensure exceptional performance for a broad range of applications. We help you and other
customers around the world speed up system development, reduce costs and bring vehicles
and vessels to market faster.
Danfoss Power Solutions – your strongest partner in mobile hydraulics and mobile
electrification.
Go to www.danfoss.com for further product information.
We offer you expert worldwide support for ensuring the best possible solutions for
outstanding performance. And with an extensive network of Global Service Partners, we also
provide you with comprehensive global service for all of our components.
Local address:
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already on order provided that such alterations can be made without subsequent changes being necessary in specifications already agreed.
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